P0420 lexus is300

Jul 1, 2011 · I just bought a lexus is300 and I popped up a p0420 code now a day after a exhaust valve dropped into the combustion chamber causing expensive engine damage. #68 - lexus is300 - 11/21/2010 - 09:39 P0420 vs over 10% Ethanol gasoline

I have codes p0305, p0420, and p0430 on my 2003 lexus is300. could you please help me figure out what it might be? So - Answered by a verified Lexus Mechanic. ... My 2002 Lexus is300 was making weird grinding noises as I turned the wheel, both while moving and still.99 - 03 Lexus RX300 ; p0420 on 2002 rx 300 p0420 on 2002 rx 300. rx300; p0420; By sa3ma4na October 17, 2016 in 99 - 03 Lexus RX300 Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. sa3ma4na. Posted October 17, 2016. sa3ma4na. Regular Member;After pumping gas...IS won't start. Car is a 2001 IS300 with 140k and pretty much...whenever I need to put gas into the car and try to start it up it won't start UNLESS I hit the gas and leave it down at least 10% to keep the RPMS up; otherwise it will have a really rough idle (almost dieing). After maybe...1-2min it will smooth out and be fine ...I have codes p0305, p0420, and p0430 on my 2003 lexus is300. could you please help me figure out what it might be? So - Answered by a verified Lexus Mechanic. ... My 2002 Lexus is300 was making weird grinding noises as I turned the wheel, both while moving and still.OEM DENSO 1x Mass Air Flow Meter MAF Sensor for 2001-2005 Lexus Is300 3.0l 4.8 out of 5 stars ... Yes I change my original upstream catalist converter to a headers and vehicle PCM set a p0420 code catalist efficiency Yes ...No smartphone mirroring. Super thirsty. View 34 images. Comfortable, conservative, solid – three words that describe the 2020 Lexus IS300 Luxury mid-size sedan. It’s been around a while, the ...Nov 7, 2015 · So I plugged a OBDII in and it gave me a couple codes to do with the TPS. The codes were p0120 and p1211. I replaced the tps and got throttle response back but it does not respond until halfway into pushing the pedal. Then I plugged the OBDII back up and now the code p0120 is still there. Any help is appreciated greatly! Labor: 1.0. The cost to diagnose the P0450 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

jasonm4444 said: P420 B1 efficiency code should be taken care of the TS PNP. It's not related to anything else so i would verify your connections are ok and if it comes back on, i would think there's an issue with the TS delete/sim module and would contact TS. The spark plug change would not cause this code whatsoever.A Lexus Is300 Catalytic Converter Replacement costs between $4,249 and $4,755 on average. Get a free detailed estimate for a repair in your area.1)The codes P0430 and p0420 indicate your catalytic converter efficeniency is reduced. This would lead one to believe. that the catalytic converter needs to be replaced which can be a major expense since your ls430 has. three catalytic converters. (two forward and one rear) . With a little investigation I found that.I have codes p0305, p0420, and p0430 on my 2003 lexus is300. could you please help me figure out what it might be? So - Answered by a verified Lexus Mechanic. ... My 2002 Lexus is300 was making weird grinding noises as I turned the wheel, both while moving and still.2007 lexus ES 350 108,000 lights on, scanned got p0420, & p0430 codes showing both o2 sensors & both cats bad. Reset - Answered by a verified Lexus Mechanic We use cookies to give you the best possible experience on our website.diehard: The check engine light came up on m car too, a lexus ES300. Scanned it and this same code came on, but on bank 2. Not sure where bank 2 is. Somebody advised me to change the catalyst converter. I read somewhere that the back O2 sensor are the ones that actually send signals used to determine the efficiency and …One of the most common trouble codes with the Lexus IS 300 is the P0446 code. This trouble code references a number that is given to you when you plug your I...Are there any other codes (besides DTC P0420 or P0430) being output? Check gas leakage on exhaust system. Check heated oxygen sensor (bank 1, 2 sensor 1) Check heated oxygen sensor (bank 1, 2 sensor 2) Replace both of exhaust manifold (front catalyst) and front exhaust pipe.

May 6, 2016 · How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av... P0446 is a diagnostic trouble code (DTC) associated with a vehicle’s evaporative emissions control system. It signifies an issue in the vent control circuit in your Lexus IS 300’s EVAP system, which prevents fuel vapor from being released into the atmosphere. A prevalent issue with the Lexus IS 300 is the P0446 code.6 months ago I bought my 2002 lexus is300, my car started to struggle shifting from 1st to 3rd, by letting off the throttle it would help shift. After a couple months I started hearing crackling noises, I wasn’t to sure if it was the pulleys pulling the serpatine belt or something else. Anyways...Save. nightsky.fusion · #7 · Jun 2, 2017. There are actually two VSVs on the car. You found the one up front but the other one is underneath the trunk. Here's a video for replacement (definitely a PITA). For reference, I bought a severely mistreated IS300 last year that had P0440, P0442 and P0446.6 months ago I bought my 2002 lexus is300, my car started to struggle shifting from 1st to 3rd, by letting off the throttle it would help shift. After a couple months I started hearing crackling noises, I wasn’t to sure if it was the pulleys pulling the serpatine belt or something else. Anyways...Nov 13, 2005 · kponti said: Sounds more like a catalytic problem than a sensor problem. The code reads: P0430- Catalyst System Efficiency Below Threshold (Bank 2) Using a simulator will do the job of removing the cel, but I bet your car will eventually (if not already) run a little like crap (just sometimes).

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P0420 is cat, not 02 sensor, a sensor would be 1133,35 etc something like that. If it were my car, I'd clear it out and wait and see if it comes back. If it does, replace the cat. 01 iS ASP Reply Save Like M MacDaddy_J_420 · #3 · ...Mar 1, 2012 · #1 · Feb 29, 2012 I have a 2002 Lexus IS300 with this curse of a code that never goes away. My car was randomly selected for a smog lab inspection by the DMV in order to reinstate my registration, however i have a CEL that keeps recurring P0420 (Catalytic converter efficiency below threshold BANK 1) So far ive done the following to attempt the fix: Whats up guys welcome back! Today we are fixing code p0442 evaporative emissions system leak ( Small leak ) With the culprit being Check valve. Enjoy! Like, ...Save. nightsky.fusion · #7 · Jun 2, 2017. There are actually two VSVs on the car. You found the one up front but the other one is underneath the trunk. Here's a video for replacement (definitely a PITA). For reference, I bought a severely mistreated IS300 last year that had P0440, P0442 and P0446.Code P0420 Lexus Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to …Lexus automobiles are designed and manufactured by Toyota Motor Corporation. Lexus is Toyota’s luxury vehicle brand, and the vehicles are manufactured in specific Lexus plants in Japan and Canada.

Lexus Models ; Lexus IS200 / Lexus IS300 Club ; Engine & Transmission ; P0420 + P0420P Fault Codes Catalyst Efficiency Below Threshhold (Bank ... p0420 and p0420p not sure what the p stands for at the end of the 2nd code. anyone have any ideas? anyone know the most common reason for this? i know its refering to the cat but there is …They called me and told me the compressor lock sensor is bad. They said unfortunately the sensor is built into the Compressor and to fix it would cost either almost $1200 for a new compressor and labor to install or around $275 to bypass the sensor. At first the $275 solution seems like a no brainer.Sep 13, 2023 · If any or both of these oxygen sensors fail, they can trigger the P0420 code. What is the p0420 code on a Nissan? The P0420 code means “Three-Way Catalyst Malfunction” in new Nissan models instead of “Catalyst System Efficiency Below Threshold (Bank 1).” Either way, the code indicates a decline in the catalytic converter’s performance. What is the Cost to Diagnose the Code P0430 Lexus? Labor: 1.0. The cost to diagnose the P0430 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.The P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. October 10, 2018. This article applies to the Lexus IS, RX, GS, LS, and ES (2005-Present)VIP GOLD. ₦ 13,000,000. Lexus RX 2010 Blue. 2010 Foreign used Lexus Rx 350 Low mileage Duty fully paid Well functioning engine and gear Clean... Foreign Used. Automatic. ₦ 19,000,000. Lexus GX 460 Premium 2013 Silver. 2013 Foreign used Lexus Gx460 Low mileage Duty fully paid Thumbstart Three roll seater...California registered 2003 IS300 (158K miles) with P0420 code with check engine light on and TRAC OFF flashing. Front - Answered by a verified Lexus Mechanic. ... I have a 2003 Lexus IS300 that comes up with code PO460 which says that back one catalytic converter has issues.Lexus: Reading Trouble Codes. If the ECU has detected a system malfunction, the check engine light will blink every .5 second. The first number of blinks will equal the first digit of a two digit diagnostic trouble code and after a 1.5 second pause, the second number of blinks will equal the second digit of same diagnostic trouble code.2007 lexus ES 350 108,000 lights on, scanned got p0420, & p0430 codes showing both o2 sensors & both cats bad. Reset - Answered by a verified Lexus Mechanic We use cookies to give you the best possible experience on our website.

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Are you looking for a Lexus dealership near you? Whether you’re in the market for a new or used Lexus, it’s important to find the right dealership that can provide you with the best service and selection. Fortunately, finding a Lexus dealer...Whats up guys welcome back! Today we are fixing code p0442 evaporative emissions system leak ( Small leak ) With the culprit being Check valve. Enjoy! Like, ...I pulled into autozone and had the code read and got the p0420. I searched the internet and found this site. I have read nearly all of the posts regarding this code, …Code P0420 Lexus Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.Apr 23, 2015 · Used car dealerships will always try to minimize the number of costly repairs to maximize profit on a vehicle. The P0420 is an easily masked problem. The P0420 is what they call a "two trip" code. Meaning that exact conditions need to be met for the car's computer to test the efficiency of the catalytic converters.. and this needs to occur twice. While driving cross country, the check engine light came on. In Abilene TX, the codes were P0128, P0430 and P0420. Finally got it to a Lexus dealer in El Paso, who reported codes P0128 and P0420. He s … read moreP0440 code mystery, 2001 IS300. One of the hoses was off near the charcoal canister valve, I secured the hoses and replaced the valve while I was in there. Thought for sure this would fix the P0440 code but the light came back on. I checked the hoses near the purge valve up under the hood and they seem to look ok.Mods and experts, please correct and add on to anything you believe is incorrect. Please keep in mind this writeup is coming from a casual driver whose most advanced auto repair skill is adding air to his tires. CEL Code: P0430 Catalyst System Efficiency Below Threshold Bank 2. Step 1.The Lexus is an automobile that is produced by Toyota. The Lexus LS 400 and the ES 250 debuted in 1989 as the first in a series of Toyota luxury vehicles. Following its entry into the U.S.The P0420 and P0430 codes, both indicating catalytic converter failures, are most commonly cause by this exhaust leak on the IS250, GS350 and GS300. The vehicle has four oxygen sensors, ... Lexus has updated the y …

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Jan 12, 2010 · ASE Certified Technician. High School or GED. 15,501 satisfied customers. Lexus LS430: 2002 Lexus LS430 had check engine lights on, no. 2002 Lexus LS430 had check engine lights on, no VSC light. Codes required replacement of both catalytic converters. Check engine light is off but … read more. Lexus IS300: Hi, I changed the sensor 2 bank 2 o2 sensor friday Hi, I changed the sensor 2 bank 2 o2 sensor friday and the check engine light went off as soon as i got 100 miles it came back on. What would cause this? the car is a 2001 Lexus is300 …Now for the Causes for these codes: Common Problems That Trigger the P0171 and P0174 Code. PCM software needs to be updated. Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.) Mass Airflow Sensor (MAF) Plugged Fuel Filter or weak Fuel Pump. Plugged or dirty Fuel Injectors.Whats up guys welcome back! Today we are fixing code p0442 evaporative emissions system leak ( Small leak ) With the culprit being Check valve. Enjoy! Like, ...California registered 2003 IS300 (158K miles) with P0420 code with check engine light on and TRAC OFF flashing. Front - Answered by a verified Lexus Mechanic. ... I have a 2003 Lexus IS300 that comes up with code PO460 which says that back one catalytic converter has issues.OEM DENSO 1x Mass Air Flow Meter MAF Sensor for 2001-2005 Lexus Is300 3.0l 4.8 out of 5 stars ... Yes I change my original upstream catalist converter to a headers and vehicle PCM set a p0420 code catalist efficiency Yes ...Whats up guys welcome back! Today we are fixing code p0442 evaporative emissions system leak ( Small leak ) With the culprit being Check valve. Enjoy! Like, ...Yup, the CEL will turn on if you remove the primary CATs. Maybe high-flow aftermarkets would help but I don't know for sure. I heard a rumor about people making some sort of electronic simulator to trick the car into thinking that the CATs are still installed.P0141 DTC stands for Oxygen Sensor Heater Circuit Malfunction on Bank 1, Sensor 2. It shows that the onboard heater circuit isn’t operating normally on the downstream oxygen sensor from bank 1. With a fault in the heater circuit, the PCM sets the P0141 trouble code. …Bank 1 Sensor 2 is for measuring catalyst efficiency not for setting fuel trim. Fuel trim is determined by the Bank 1 Sensor 1 and Bank 2 Sensor 1. I've never heard of a fuel trim of 99%. Usually short term trim is limited to 25-40%. Do you have long and short term trim numbers for banks 1 and 2. While each Lexus model differs in requirements as to what octane gas is recommended, nearly all models recommend only premium fuel be used. This ensures optimal smoothness of idle, acceleration and overall power.Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check engine light and pass an emissions test.The P0420 code is thr... ….

Nov 13, 2005 · kponti said: Sounds more like a catalytic problem than a sensor problem. The code reads: P0430- Catalyst System Efficiency Below Threshold (Bank 2) Using a simulator will do the job of removing the cel, but I bet your car will eventually (if not already) run a little like crap (just sometimes). 14,739 satisfied customers. Lexus 2002: 2002 Lexus GS300 175K Miles Symptoms: (1) 2002 Lexus GS300 175K Miles Symptoms: (1) terrible gas mileage and (2) check engine light - pulled codes p0420 and p0430 I used a … read more. According to the normal Lexus service schedule, the muffler, exhaust pipes, and mountings need to be inspected for cracks, deterioration, and damage at 105000mi or 168000km or every 18 months, whichever occurs first. Will a bad 1999 Lexus RX300 muffler cause a rattling sound from the wheel bearing?STARTING AT. $41,235 *. $46,725 * VEHICLE SHOWN. SHOP YOUR IS. BUILD YOUR IS. The 2024 Lexus IS combines more aggressive styling, new seamless connectivity and agile performance.Lexus Model: IS300 Year: 2001 Location: Texas (TX) Posted February 8, 2012 I posted in january that I had a trouble code 1349 along with trouble codes p0440 and p0430 and misfires in all cylinders. I have had the trouble codes p0440 and p0430 for awhile but the car ran fine and a few mechanics were not able to pinpoint the problem.jasonm4444 said: P420 B1 efficiency code should be taken care of the TS PNP. It's not related to anything else so i would verify your connections are ok and if it comes back on, i would think there's an issue with the TS delete/sim module and would contact TS. The spark plug change would not cause this code whatsoever.99 - 03 Lexus RX300 ; p0420 on 2002 rx 300 p0420 on 2002 rx 300. rx300; p0420; By sa3ma4na October 17, 2016 in 99 - 03 Lexus RX300 Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. sa3ma4na. Posted October 17, 2016. sa3ma4na. Regular Member;Oxygen sensor (Problem P0420 on the OBDII controler)The oxygen sensor is a device which determines the oxygen content of the exhaust gas. Since the amount of... P0420 lexus is300, ClubLexus - Lexus Forum Discussion. Lexus Model Forums. RX Models. RX - 1st Gen ... USA RX300 have the charcoal canister integrated into Evap Canister assemply, ... Check Engine P0420 & Air Filter. ayonnebay. ES - 1st to 4th Gen (1990-2006) 10. 04-12-09 03:57 PM., Labor: 1.0. The cost to diagnose the P0450 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto …, Code P0442 Lexus Tech Notes. The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0442 code. User Submitted Video. Check if Lexus has issued a Factory Service Bulletin for the P0442 code (2013 - Up Models): → …, 25,658 satisfied customers. Lexus 2002: 2002 Lexus GS300 175K Miles Symptoms: (1) 2002 Lexus GS300 175K Miles Symptoms: (1) terrible gas mileage and (2) check engine light - pulled codes p0420 and p0430 I used a … read more., Sep 21, 2011 · 1)The codes P0430 and p0420 indicate your catalytic converter efficeniency is reduced. This would lead one to believe. that the catalytic converter needs to be replaced which can be a major expense since your ls430 has. three catalytic converters. (two forward and one rear) . With a little investigation I found that. , A P0420 code is a trouble code on OBD-II equipped vehicles. from 1996-newer sold in North America support this generic powertrain code. This code is a pretty …, A diagnostic check shows up ' Fault Code P0420 -. Catalyst System efficiency below threshold (bank 1)'. I have looked up Lexus rx300 diagnostic Fault Code List on internet and that code shows trouble area. 1. 3 way cat. converter. 2., Lexus Model Forums. RX Models. RX - 1st Gen (1999-2003) Oxygen Sensor (O2) Bank 1, Sensor 2 DIY; RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models 12-16-14, 12:36 PM How-Tos on this Topic Last edit by: IB Advertising. See related guides and technical advice from ..., Lexus: Reading Trouble Codes. If the ECU has detected a system malfunction, the check engine light will blink every .5 second. The first number of blinks will equal the first digit of a two digit diagnostic trouble code and after a 1.5 second pause, the second number of blinks will equal the second digit of same diagnostic trouble code., Feb 8, 2012 · First Name:Lukas. Lexus Model: Is300. Year: 2002. Location: South Dakota (SD) Posted September 23, 2014. those codes are for the catalytic converters: p0420-bank 1 cat, p0430-bank 2 cat, p0440 is the cat in the y-pipe. Dont recommend using sims which can cause further issues down the road, when i got those codes, i replaced the cats with ... , Most annoying code I ever had was VSC. I learned after some research that as long as any CEL code was active, VSC would refuse to operate (bastard). After spending a few months clearing dirty ABS wheel sensors and oxygen sensor codes, VSC still refused to go out. So I did the ZPC, zero-point calibration., A diagnostic check shows up ' Fault Code P0420 -. Catalyst System efficiency below threshold (bank 1)'. I have looked up Lexus rx300 diagnostic Fault Code List on internet and that code shows trouble area. 1. 3 way cat. converter. 2., Lexus RX330 Check Engine Light With Codes P0440, P0441, P0442, or P0446 - 7 reports. Learn about this problem, why it occurs, and how to fix it., Dec 9, 2017 · If you are interested in buying the EVO resurrection Project car or The IS300 build project car, hit me upon IG @initialized_frsToday we are fixing my check ... , Are you looking for the best price on Lexus parts? Whether you’re a DIY enthusiast or a professional mechanic, finding the right parts at the right price can be a challenge. Fortunately, there are several ways to get the best price on Lexus..., Detailed information on the P0420 dtc trouble code. Includes why it happens and how to fix your car. Trouble Code - P0420 Catalyst System Efficiency Below Threshold (Bank 1) ... I just bought a lexus is300 and I popped up a p0420 code now a day after a exhaust valve dropped into the combustion chamber causing expensive engine damage. #68 ..., TobiasSing Super Moderator · #6 · Oct 10, 2022. Yep. Every consistent p0420 or p0430 code always means new cats are needed. Anything else is a waste of money. The O2 sensors were working properly and doing their job, that's why the codes came up. If they were not working, there are separate codes for it. Reply., May 6, 2016 · How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av... , 00-05 Lexus IS300 - 3.0L 2JZ-GE - Check Engine Light ON P0420 & P0430 - Catalytic Converter Replacement Vehicle has check engine light on with trac light fla..., Access our free Firing Orders Repair Guide for Lexus RX 2000-06 through AutoZone Rewards. These diagrams include: Fig. 3.0L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system. Fig. 2.0L engine with DIS Firing order: 1-3-4-2 Distributorless ignition system. Fig. 2.4L (2AZ-FE) and 2.7L (3RZ-FE) engines with DIS Firing order: 1-3 …, I have codes p0305, p0420, and p0430 on my 2003 lexus is300. could you please help me figure out what it might be? So - Answered by a verified Lexus Mechanic. ... My 2002 Lexus is300 was making weird grinding noises as I turned the wheel, both while moving and still., Hi there. I hope all is well with everyone. My wife and I have a 2000 ES300 Platinum Edition. The car has been simply wonderful in our three years of ownership. Recently however, the check engine/trac light illuminated and after a quick scan code PO446 was discovered. I started by tightening the ..., 1)The codes P0430 and p0420 indicate your catalytic converter efficeniency is reduced. This would lead one to believe. that the catalytic converter needs to be replaced which can be a major expense since your ls430 has. three catalytic converters. (two forward and one rear) . With a little investigation I found that., 🏎 P0430 Cheap Permanent Fix for my Lexus IS300 P0420 ch…, Product Details. EZ CEL Fix oxygen sensor eliminator is conveying the Electronic Engine Management with mimicked, fluctuating voltage signal and overrides the Electronic Control Unit into thinking the emissions are normal. Lexus IS300 oxygen sensor simulator will allow you to drive without cat and still keep the service engine soon light off. , 1st-Gen IS300. Go Fast Stuff P0430 CEL (completely stock motor) Jump to Latest ... Community dedicated to Lexus IS Enthusiasts. Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300, IS250, IS350. Full Forum Listing. Explore Our Forums., Dec 24, 2014 · This article applies to the Lexus ES (2007-2014). Replacing the stock exhaust with an aftermarket system is relatively easy on your Lexus. The most difficult aspect of this job is getting the clearance under the vehicle if you do not have access to a lift. Removing and replacing the catalytic converter is a little bit harder and a bit more ... , 1st-Gen IS300. Go Fast Stuff P0430 CEL (completely stock motor) Jump to Latest ... Community dedicated to Lexus IS Enthusiasts. Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300, IS250, IS350. Full Forum Listing. Explore Our Forums., Aug 25, 2011 · J. jasonm4. 18192 posts · Joined 2009. #4 · Sep 1, 2011. P0440 is same as P0441, which is detection of a lack of negative pressure in the system/ (tank) and tells you to check the same things pretty much as DTC P0446. The purge/vent sensor is used to detect abnormalities in the EVAP system (charcoal canister). , ASE Certified Technician. High School or GED. 15,501 satisfied customers. Lexus LS430: 2002 Lexus LS430 had check engine lights on, no. 2002 Lexus LS430 had check engine lights on, no VSC light. Codes required replacement of both catalytic converters. Check engine light is off but … read more., Jan 12, 2010 · ASE Certified Technician. High School or GED. 15,501 satisfied customers. Lexus LS430: 2002 Lexus LS430 had check engine lights on, no. 2002 Lexus LS430 had check engine lights on, no VSC light. Codes required replacement of both catalytic converters. Check engine light is off but … read more. , P0420 OBD-II Trouble Code. Technical DescriptionCatalyst System Efficiency Below Threshold (Bank 1) ... 01 - 06 Lexus IS300 ; Check Engine Light Theme . IPB 4.6 (Default), I hooked my scanner and soon enough I was slapped in the face with the holy trinity P0440 (EVAP Malfunction ), P0442 (Large Leak Detected), P0446 (EVAP vent Malfunction), and to top it all off I also got the Holy Matrimony P0171 (Bank 1 too lean) and P0174 (Bank 2 too lean) I decided to tackle all the EVAP codes first and leave P0171 and P0174 ...