P0420 code kia soul

Honda. In Honda vehicles, the P0420 code is not uncommon. Common culprits include deteriorating catalytic converters and oxygen sensors. Regular maintenance and prompt repairs can help resolve the issue efficiently. Ford. Ford vehicles may also experience the P0420 code. Exhaust leaks, failing catalytic converters, and malfunctioning oxygen ...

P0420 code kia soul. P0130 is a very common OBDII code that occurs in the Kia Rio. It is typically caused when the Oxygen Sensor voltage is not within normal operating conditions. Kia Rio P0130 Symptoms Typically, the only symptom of P0130 is going to be the service engine soon light. ... Kia Soul P0130: O2 Sensor Circuit Malfunction (Bank 1 - Sensor 1) Jason on ...

Esta página está pensada para ayudarte a solucionar los problemas de Código de avería P0420 del Kia Soul. Cubre el significado de Kia Soul P0420, los síntomas, las causas y las posibles soluciones. En el Soul, el OBDII P0420 suele estar causado por un sensor de oxígeno defectuoso, pero también puede haber otras causas.

Hey everyone, Have a 2014 Soul+ 2.0 and have had some codes for misfire and P0420 code, which is catalyst error bank 1, Talked to local parts store and...Kia Soul: On-vehicle Inspection - Ignition System - Engine Electrical System - Kia Soul 2014-2019 PS Service Manual 2. Coil pack primary resistance 0.79 ohm +/- 15 %? 3. Plug gap 0.35" to 0.039"? (0.9 - 1.0 mm) Kia Soul: Spark Plug Description - Ignition System - Engine Electrical System - Kia Soul 2014-2019 PS Service Manualel codigo p2191 se define por un regulador de precion de gasolina.....Antes de remplasarel regulador de gasolinaverifica si precion de la Bomba de gasolina y...Jan 19, 2020 · When you see a DTC Code P0420, there’re several checks you can do: Check the code from your OBD2 Scanner / Car Code Scanner and verify that it’s the only code present. If other codes are on the list, they should be checked first. Sometimes, when you see O2 sensor related codes, fixing those might also fix the code P0420.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code KIA P0442 Saving Repair ...

Nov 12, 2018 · Kia Soul P0420 Code Symptoms. The P0420 code in a Kia Soul will often be thrown if one of your car’s oxygen sensors is not functioning correctly. There are rarely drivability issues associated with P0420. For most people, the first sign that anything is wrong is the service engine soon light coming on.It states warm up…. I got a P0420 code on my 2014 Kia Soul. It states warm up catalyst efficiency, below threshold Bank 1. The car runs fine accept when after I stop at a light, and press the gas pedal, the RPM goes to 3, then back down to 2. Also when it's raining, my windows fog up if I turn on my heat but clears up if I turn on my air ...When your vehicle detects an issue in cylinder number 4, the P0272 code or other related trouble codes can trigger. What Does the P0272 Code Mean? The P0272 code is defined as Cylinder 4 Contribution/Balance. This code triggers when the powertrain control module (PCM) detects that cylinder 4 isn't contributing enough power.In this video, you'll learn the causes and solutions of the P0420 code. The causes of the P0420 code are a bad catalytic converter, an ECM update, an exhaust...Mar 21, 2024 · The P0420 code indicates that the Engine Control Module (ECM) has identified a decline in the efficiency of the catalytic converter on Bank 1. This could be attributed to a malfunctioning catalyst or potentially be a false alarm triggered by a defective O2 sensor. The engine control module (ECM) uses two O2 sensors, one in front, and one behind ...

Our 2015 Kia Soul has been well-maintained but at 69,000 miles showed the dreaded flashing check engine light and decided to limit its acceleration on the interstate a couple of weeks ago. We quickly realized it had gone into limp home mode.P0420 Code frustation ... Come discuss the Kia Sorento, Rio, Sportage, Soul and more! Show Less . Full Forum Listing. Explore Our Forums. 2011 - 2013 ...The P050A code in a Kia Soul can have various underlying causes. Some common reasons include a faulty or clogged idle air control valve, vacuum leaks, issues with the throttle body, a malfunctioning ECM, or wiring problems. It is important to perform a thorough diagnosis to pinpoint the exact cause and proceed with the appropriate repairs.Dear Kia Soul Owner: Kia has identified a defect in your vehicle which relates to motor vehicle safety. This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Kia Motors has decided that a defect which relates to motor vehicle safety exists in the 2012-2016 MY Kia Soul vehiclesS. Soul208 Discussion starter. 35 posts · Joined 2015. #1 · Jan 19, 2015. Here I am again, sitting in the Kia shop with a check engine light on sporting a P0455 - EVAP Leak - Large Leak Detected Code. I have a 2010 2.0 Automatic with 172,000+ miles. I have already had a new gas cap put on and a solenoid valve replaced and the code keeps ...

Culligan vs ecowater.

Check engine light came on, Code P0420 Catalyst System Efficiency Below Threshold (Bank 1) poped up on my scanner. Cleared the code and have driven it over 50kms, no issue (low or weaker performance). I have a 2013 Rio with 143000 kms. Warranty on emmision system ended at 130,000 kms. Hope it doesn't return, but from what I read so far, O2 ...Kia Codes; Trouble Code Fault Location Probable Cause; P0404: Exhaust Gas Recirculation Circuit Range/Performance: Wiring, EGR valve, PCM: P0406: Exhaust Gas Recirculation Sensor "A" Circuit High: EGR valve, position sensor: P1000 - P1099 (Fuel and air metering and auxiliary emission control)Mar 3, 2014 · P0420 Code frustation ... Come discuss the Kia Sorento, Rio, Sportage, Soul and more! Show Less . Full Forum Listing. Explore Our Forums. 2011 - 2013 ...Code p0420 tells you that it is not cleaning properly and you can monitor downstream o2 data to see if it's bad. ... 2014 kia soul 10400.miles cat went out 6month after Bought it and dealer wouldn't replace cat and engine was burning oil bad still wouldn't do anything they kept say couldn't find any thing wrong with engine was under warranty ...P0420 KIA Code - Warm Up Catalyst Efficiency Below Threshold Bank 1 - Code Popularity: 102,921 Views - Repair Importance Level: 2/3 - Repair Difficulty Level: 2/3. Table of contents. Created and updated by William Orellana on Aug 20, 2020. Possible Causes; Tech Notes;

P0014 is a relatively common trouble code for vehicles that have Variable Valve Timing (VVT). This includes the Kia Soul. VVT adjusts the position of the camshaft (s) to maximize the combustion efficiency of the motor. P0014 means that the camshaft position is too far advanced from where it should be in relation to normal operating.Jan 29, 2019 · P0420 is a catalytic converter insufficiency code. What can trigger the cel. An Oxygen sensor fault , worn cat , maf issue , etc , You run certain test to pinpoint the issue. An inexpensive code reader with live data , can be use to look at certain pids of info to help pinpoint your diagnosis. waddy. Like.Summary. The P200A code stands for "Intake Manifold Runner Performance (Bank 1).". The code shows up when the powertrain control module (PCM) detects a problem with the intake manifold runner control (IMRC) system. Issues that could trigger the code include a damaged IMRC, flaps, linkage, or bushings, among others.#1 · Sep 20, 2023 (Edited) My 2013 Soul keeps popping the P0420 code. It has 296,000 miles on it and CEL first appeared around 236,000 miles after I replaced the clutch. …To diagnose the P0011 KIA code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Los signos de un código de falla P0420 KIA pueden ser: Eficiencia del catalizador de calentamiento por debajo del umbral, banco 1. Se enciende la luz de fallo de motor (Check Engine). Pérdida de potencia en el vehículo. Aumento en el consumo de combustible. Olor a huevos podridos proveniente del escape.The Kia Soul is a small and boxy subcompact hatchback that was first introduced in 2010. ... Using a loaner code reader from Advanced Auto Parts we were able to see the P0420 code. Because of this we sent it to our local mechanic. They saw the same code using their reader (checked twice), looked and confirmed that the catalytic converter was ...How to diagnose code P0420 on a Kia Niro. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust flow, as well.

#1 · Jul 25, 2023. My 2015 Kia Soul broke down a few weeks ago. Using a loaner code reader from Advanced Auto Parts we were able to see the P0420 code. Because of this …

Now, we've established that DTC P0420 is caused by a bad signal from your O2 sensors. This could be for one of two reasons: The catalytic converter performance, as measured by your O2 sensors, is not what it should be. One or both of your O2 sensors is faulty, either because of an electrical fault or because the sensor probe is choked up with ...P0420 Diagnosis: Kia Rio. The most common fix for P0420 in the Kia Rio is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Rio into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Kia Rio: 1. Check for Other Codes.PO420: P0420 Catalyst System Efficiency Below Threshold. How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which …Oct 6, 2022 · I got a P0420 code on my 2014 Kia Soul. It states warm up catalyst efficiency, below threshold Bank 1. The car runs fine accept when after I stop at a light, and press the gas pedal, the RPM goes to 3, then back down to 2. Also when it's raining, my windows fog up if I turn on my heat but clears up if I turn on my air conditioner, even when it ...Hey all I have a 2020 Kia Soul with 73k miles it's throwing the code stated above Normally I'm aware this is a crankshaft sensor But it threw this code last time right before an oil change I changed the oil and it went away and I didn't think much of it since it was running perfectly. ... 2016 Kia Soul Pulling Both P054A & P0420 Codes ...What Does The P0420 Code Mean? The P0420 code indicates that the Engine Control Module (ECM) has identified a decline in the efficiency of the catalytic converter on Bank 1. This could be …It states warm up…. I got a P0420 code on my 2014 Kia Soul. It states warm up catalyst efficiency, below threshold Bank 1. The car runs fine accept when after I stop at a light, and press the gas pedal, the RPM goes to 3, then back down to 2. Also when it's raining, my windows fog up if I turn on my heat but clears up if I turn on my air ...

Hoobly ohio kittens.

Jaidy alcala edinburg tx.

In my 2015 Kia Soul, the oil light has been blinking. I have oil in it, I've had one accident 1 and a half years ago, - Answered by a verified Kia Mechanic. ... Code P0455 and P0420, mechanic says I need 2 catalytic converters. Car is 2015 Kia Soul , ...In my 2015 Kia Soul, the oil light has been blinking. I have oil in it, I've had one accident 1 and a half years ago, - Answered by a verified Kia Mechanic. ... Code P0455 and P0420, mechanic says I need 2 catalytic converters. Car is 2015 Kia Soul , ...Good morning, Quartz readers! Good morning, Quartz readers! More fallout from China’s Hong Kong security law. As China’s parliament moved to advance a national security law for Hon...I have a 2012 soul with a1.6 no power an d it has the following codes p0420,p0191, p0453. Consistent won't get above - Answered by a verified Kia MechanicHow To Diagnose. If you are experiencing problems with your Kia Soul related to the P0441 code, then there are several steps you can take to diagnose the issue. First, check the fuel cap on your Soul and ensure that it is tightly secured. A loose or faulty fuel cap is often the cause of the P0441 code. If the fuel cap appears to be in good ...2015 Soul, 1.6 L, V4 - 93,000 + mi. Code P0420 Catalyst operating below minimum threshold. P0420 is an all around code dealing with emmisions. To learn more about this code, view YouTube videos of scannerdanner. or any other videos explaining about 02 sensors, fuel trims, catalytic converter, etc.This video shows you how to remove and replace the downstream oxygen sensor on a 2012 Kia Soul. The check-engine light was on and the free diagnostic test at...Feb 9, 2022 · P0420 has been coming up regularly for 6-8 months now, and my front cat finally plugged up this week. $1,400 CAD for the parts only, but if I had set the parts aside ahead of time from Rock Auto, I would have paid about $1,000 in total for these items. Labor was another 3.5 hours to replace everything.Here’s a good P0420 diagnostic order for the Kia Sportage: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Sportage is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your vehicle. Misfire Codes.Got a 07 V6 STS, a couple of weeks ago got a code p0017, then 0016 and 0018, wasn't driving it much and last week parked it and a couple of hours later didn't start. Had to get it towed , the mechanic said he thinks my timing chain broke cause one bank isn't working, he said he took the intake manifold off to test the compression on the car.The Kia Code P0011 refers to a specific fault code that indicates an issue with the Variable Valve Timing (VVT) system in a Kia vehicle. When this code appears, it means that there is a problem with the VVT system's Camshaft Position - Timing Over-Advanced or System Performance Bank 1. This is typically due to a mechanical fault or an ... ….

Summary. Code P0300 stands for "Random or Multiple Cylinder Misfire Detected.". In most cases, a P0300 is accompanied by other trouble codes from P0301 to P0308. There are many factors that can trigger this trouble code, including problems with the ignition system and fuel delivery, vacuum leaks, and engine mechanical issues, among others.It's important to note that this code won't be set unless the cam sensor signal goes away. P0341 code refers to a problem with the camshaft position sensor (CMP) signal on Bank 1. It could be that the signal coming from the CMP is not matching, not within the expected range, or not timed properly with the crankshaft position sensor's (CKP ...Here's a good P0420 diagnostic order for the Kia Amanti: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Amanti is to verify there aren't any other trouble codes. Three types of codes can give clues as to what's going on with your car. Misfire Codes.2010 Kia Soul Sport 2.0L: Replace CAT: 2007 Subaru Impreza Outback Sport 2.5L: Replace CAT: 2002 Volkswagen Jetta GLS 2.0L: Replace CAT: 2007 Hyundai Sonata Limited 3.3L: ... Code P0420 is stored by the ECU which compares the front and rear O2 waveforms. While the front one should fluctuate rapidly between 0.1 and 0.9V, the rear sensor should ...To diagnose the P050A KIA code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Mar 28, 2018 · Popped a P0441 code today. 2014 Soul +, 2.0, 71K. Was traveling to work when I noticed the engine light on. The Soul is running fine, I thought. Purchased gas, made sure of the cap. Light still on. Later went to parts store to confirm code. P0441 EVAP Purge solenoid.Esta página está pensada para ayudarte a solucionar los problemas de Código de avería P0420 del Kia Soul. Cubre el significado de Kia Soul P0420, los síntomas, las causas y las posibles soluciones. En el Soul, el OBDII P0420 suele estar causado por un sensor de oxígeno defectuoso, pero también puede haber otras causas.HYUNDAI KIA CODE P0420 CATALYTIC CONVERTER FIX, ENGINE LIGHT ONIf you have Hyundai or Kia and you have engine light and code P0420 Catalyst System Efficiency...A personnel shakeup at the US Federal Reserve Bank of Minneapolis last week at first flew under the radar; by the time the Minneapolis Star-Tribune reported the news, followed by o...Manually check that the wiring isn't damaged, and the host and clamps are tight and fitted. Next, replace damaged wires, then clear the codes, and do a test drive to see if the P0106 code comes back. Remove and clean the MAP sensor with an electronic parts cleaner. Clean corrosion on the engine ground, if there is any, with automotive ... P0420 code kia soul, I found this code list while doing a Google Search for Kia OBD-II codes: OBD-II (KIA OBD-II Codes) ... P0420 Catalyst System Efficiency below Threshold - Bank 1. ... Kia Soul Owners. 424.5K posts 50.7K members Since 2008 We're the ultimate Kia Soul community dedicated to Soul owners and fans! ..., To diagnose the P0496 KIA code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour., Jul 29, 2023 · How To Diagnose. If you are experiencing problems with your Kia Soul related to the P0441 code, then there are several steps you can take to diagnose the issue. First, check the fuel cap on your Soul and ensure that it is tightly secured. A loose or faulty fuel cap is often the cause of the P0441 code. If the fuel cap appears to be in good ..., We have a 2016 Kia Soul 2.0L . We received the knock sensor computer update form Kia a month ago. ... Car running best in 5 years and went into limp mode 1326 Code and P0420 code. Any suggestions as this is first time for the 1326 code. Possible bad Knock Sensor or the Catalytic converter setting it off? Save Share. Like. Insert Quotes …, Summary. Code P0300 stands for "Random or Multiple Cylinder Misfire Detected.". In most cases, a P0300 is accompanied by other trouble codes from P0301 to P0308. There are many factors that can trigger this trouble code, including problems with the ignition system and fuel delivery, vacuum leaks, and engine mechanical issues, among others., To diagnose the P0441 KIA code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour., P0452 KIA Code - EVAP Emission System- Pressure Sensor Low Input - Code Popularity: 24,014 Views - Repair Importance Level: 1/3 - Repair Difficulty Level: 3/3. Table of contents. Created and updated by William Orellana on Jun 14, 2020. Possible Causes; Description; How to Fix; What does this mean?, =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code KIA P0442 Saving Repair ..., Here’s a good P0420 diagnostic order for the Kia Sportage: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Sportage is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your vehicle. Misfire Codes., P0401: Faulty EGR (Exhaust Gas Recirculation) valve. P0455, P0446, P0442, P0440, or P0411: Problem with the evaporative system. P0305 or P0300: Engine misfires. P0175 or P0171: Faulty oxygen sensor. While these are the most common codes that the 7E8 engine code menu shows, they aren’t the only ones that the menu can have., kiaguy002. 1595 posts · Joined 2015. #7 · Feb 5, 2020. I've never read an account of spark plugs having any effect on a P0420, one way or the other. Yes, bad plugs causing misfire will eventually trash out a cat and cause the P0420, but once that occurs, it's then too late for new plugs to 'fix' the cat., New to this site. Looking for advice. 2015 Kia Soul 2.0 liter. Last week threw codes p0300 p0301 p302 p304. So this first tells me multiple misfires. The other tells me in cylinder 12&4. Took it to a local shop who read the codes and told us to go straight to dealership as still under warranty. Ran fine on way there., In fact, it is rare for code P0420 to appear by itself, and especially if the application is fitted with an OEM catalytic converter that is less than 100 000 miles old, which distance represents the federally mandated warranty period of OEM catalytic converters. ... Kia. Model: Soul. Year: 2015. Miles: 93,890. Engine: 1.6. 5. Reply. Robert. 5 ..., P050A and secondary P0420. I own a 2014 1.6 base model with a little less than 100k in it. Was have P050A code come on in cold weather with high idle at start but then recently took it to kia to get logic update. That fixed the problem of high idle but then randomly the check engine light will come on for a couple days then go off again for a ..., The repair cost of the P0420 code varies according to relevant part repair, vehicle model, and labor cost. If the P0420 code is triggered due to a faulty catalytic converter, your mechanic may cost from $480 to $1610 to fix it. The estimated cost of repairing the P0420 code is given below., Getting engine light for kia soul 2015 1.6l. Code p0420. ecu has been updated prior to light going on. are they still - Answered by a verified Kia Mechanic ... 2019 Kia soul, check engine light on code says something like catalytic converter to rich, will a cleaner solve that before I spend money on service ..., Síntomas del código OBD2 P0420. Los síntomas de un código de avería P0420 pueden ser:. Pérdida de potencia del motor: El vehículo puede experimentar una disminución en su rendimiento y tener dificultades para acelerar. Aumento en el consumo de combustible: El automóvil puede consumir más combustible de lo normal debido a un problema en el sistema catalizador., 4'th Cylinder. P0304 is a cylinder-specific misfire code, meaning only your Soul's fourth cylinder has a misfire. Before you can even diagnose P0304 in your car, you need to find the fourth cylinder's location. On "V" configuration engines, it'll usually be the second cylinder on the head further away from the front of the engine., 2015 Kia Soul Bad Injectors, P2191. Hey everyone, figured I would attempt to get some insight before doing anything to the car. I have a 2015 Kia Soul 1.6L with just under 100k miles. Had a P2191 code come up for a lean condition under load. Took it to the dealer and they said all the injectors were fouled and they wanted to replace all of them., Oxygen sensors are only a part of a greater system, meaning if the p0420 code (or p0141, or p0135) is thrown, that doesn't necessarily indicate the oxygen sensors need replacement. Rather, there could be something else in that system does that's causing the oxygen sensors to appear faulty. This is actually the case with most check engine codes., #1 · Jul 25, 2023. My 2015 Kia Soul broke down a few weeks ago. Using a loaner code reader from Advanced Auto Parts we were able to see the P0420 code. Because of this …, 2016 Soul with the 2.0 engine. Last spring on cold mornings the check engine light would come on with the P0420 code when I check it with my code reader. Then nothing all summer but with the cold weather back, the light is coming on more frequently. I know there was a catalytic converters recall for the 1.6 engine bit not the 2.0., What to do when you get a P0420 catalytic converter code. If you've got a check engine light with either a P0420 P0420 catalytic converter code or a P0430 trouble code, don't automatically replace the oxygen sensor. Why? Because a herP0420 catalytic converter code is almost NEVER caused by a bad oxygen sensor. Here's a step by step guide ..., 2011 Kia Soul p0455 evap leak code resolved. It ended up being the fuel tank pressure sensor. Thanks for watching!, When I first got the car, at 125,900 miles in August 2017, I had to replace the Canister Purge Valve (At least I think that's the right name for it.) Up on the back of the Engine. Check Engine Light was on and I had a code of p0441. Replaced the valve, cleared code, thought nothing of it. That was at 142,000 miles., Sep 28, 2017 · Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC176. Summary: Kia Motors America (Kia) is recalling certain 2012-2016 Kia Soul vehicles equipped with 1 ..., The most common fix for P0420 in the Kia Borrego is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Borrego into an exhaust shop for an (expensive) new catalytic converter, let's ensure that's what you need. Here's a good P0420 diagnostic order for the Kia Borrego: 1. Check for Other Codes., GENERATION 1 (2010 to 2013) Soul Related. Soul General Discussion (Gen 1) New Owner with two codes P1033/0420. Jump to Latest Follow 2K views 3 ..., Cost of diagnosing the P0420 KIA code The cost of diagnosing the P0420 KIA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour. When is the code detected, P0455 Code. Strange question. My wife's Soul is throwing up the Evap Emissions code. We tried replacing the fuel cap which wouldn't "click" tight, but the new one won't click tight either. I've inspected the filler neck, and I don't see any damage or debris (although I haven't looked a new one for comparison, so I might be missing something)., Jul 9, 2015 · 426 posts · Joined 2014. #3 · Jul 9, 2015. There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly., Recall date. 2015-03-01. Recall no. 15V123000. Kia Motors America (Kia) is recalling certain model year 2014-2015 Soul and Soul electric vehicles manufactured July 21, 2013, to January 8, 2015. A ..., Many factors can cause the car computer to register DTC P0420 on Toyota or any car model. This makes it challenging to diagnose and fix the problem. Engine running rich or lean. Malfunctioning upstream or downstream oxygen sensor. Leaking fuel injectors. Lousy catalytic converter. Lousy engine coolant temp sensor.