P0138 chevy malibu

Honda describes the P0158 code this way:. The secondary heated oxygen sensor (HO2S) (sensor 2) detects the oxygen content in the exhaust gas downstream of the three-way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control based on the air/fuel ratio (A/F) sensor (sensor 1) output voltage.

Chevrolet Malibu P0011 definition: Intake Camshaft Timing – Over-Advanced Bank 1. Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. Diagnosis: This trouble code severely impacts the drivability of your vehicle.2013 malibu 2.5L ls having problems with stalling and idle dropping while at complete stop and foot is on brake. when put into neutral or park car idle returns to normal range. Just the engine shuts off all car lights and dash lights and radio remain on. car has 72,000 miles have changed the...Here are a few of the top reported P0138 code symptoms. Check engine Light; Reduced fuel economy; Misfiring engine; Rough idle; Trouble accelerating; Stalling engine; Causes of the P0138 Code. It might seem obvious that the P0138 trouble code comes on because the oxygen sensor has failed.Nov 9, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P013A Saving Repair Parts... 99 posts · Joined 2017. #1 · Apr 27, 2019. Strange thing happened today. My 2016 1.5T experienced a check engine light and a "reduced engine power" message. This issue only occurred for a short time. The reduce power mode was cleared after turning off the engine and restarting. The check engine light turned itself off several minutes later.

Bob Thomas is an automotive mechanic with 30 plus years experience. He is a contributor to several publications and has written many articles on automotive maintenance and repairs.He also has created many auto repair videos on YouTube.Diagnostic Trouble Code P0138 (DTC P0138) is defined as “O2 Sensor Circuit High Voltage (Bank 1 Sensor 2).”. Oxygen sensor 2 is a downstream oxygen sensor or the secondary heated oxygen sensor (HO2S 2) on Bank #1. It measures the air-fuel mixture or the oxygen storage capacity of the catalytic converter and produces a relevant output signal ... To diagnose the P0138 Chevrolet 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.The Chevrolet Malibu and Chevrolet Chevelle represent five decades of mainstay Chevys. Check out these Malibu and Chevelle profiles and pictures. Advertisement The Chevrolet Malibu, shown here in 1964 debut form, is a Chevy success story. S...When trouble code P0138 is set, this indicates that there is a high voltage (steadily above .9 volts) for more than 10 seconds indicating a lack of oxygen in the …

May 31, 2020 · when you remove the O2 sensor wire brush the O2 sensor ports so they are clean... check for any manifold/pipe leaks bolts rusted off ... just this 138 code ....138 says rich only on the driver side .. after the cat converter many times the old O2 sensor do fail 120K-140K miles... maf/injector/fuel regulator will throw other codes bank 1 sensor ... =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0131 Saving Repair Parts...P1101 Air Flow Volume Chevy Malibu “Help Needed” ... P0140 P0138 Code Chevy Truck, If you have a P0140 or a P0138 code in your chevy truck this video is for you. I will be showing you a few things you should check before replacing the oxygen sensor in your Chevy truck. Both these codes p0138 and p0140 are both for the bank 1 sensor 2 …American-made Chevrolet is one of the best-selling brands in the United States. If you are in the market for a used Chevy, whether a sedan, truck, SUV or sports car, this article highlights four of the best models to consider.P0138 is a common OBDII code that occurs in many vehicles, including theChevy Malibu. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more Voltage to...

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The most common signs of bad O2 sensor in Chevy Malibu are slow acceleration, loss of power, irregular idling, engine hesitation or jerking when accelerating, high fuel consumption, higher tailpipe emissions, foul odor from exhaust, check engine light illuminates, and sometimes stalling.Jul 31, 2012 · zblue1 Discussion starter · #5 · Aug 1, 2012 (Edited) Re: code P2138, P2138 P Resolved. Thanks for the info & pic. Since it was a powertrain/warranty related issue, I had the local dealer check it out. They checked I/P to body harness connector-OK. They came up with the same codes and an internal throttle position sensor fault (9094) remedy ... Oct 21, 2016 · Technician. automotive technology. 157 satisfied customers. 2014 2.4l chevy equinox. Wifes check engine light came on. 2014 2.4l chevy equinox. Wifes check engine light came on. Codes from diagnostic tool: P0138 and P0140. Research suggests Bad O2 … read more. Sep 26, 2018 · While it’s common for the HO2S to wear out over time, there are a number of other issues that trigger a P0138 diagnostic code and have nothing to do with the oxygen sensor. These include: An inefficient catalytic converter. Engine vacuum leaks that create a lean exhaust condition. Mass airflow sensor failure that creates a rich exhaust ... Dec 1, 2022 · According to a recent report from GM TechLink, some 2018 through 2022 Chevy Malibu vehicles may exhibit reduced engine power and one or more diagnostic trouble codes (DTCs) as the result of the ... Typically, the only symptom of P0138 is going to be the service engine soon light. In some cases, there can be other symptoms as well. These symptoms include: 1. Rough running engine 2. Smelly exhaust 3. Service light on 4. Poor MPG Most of the time, it’s not a breakdown risk. But, like anything that causes … See more

When the signal from the O2 sensor is detected by the PCM as being stuck lean or biased lean, this DTC is set. The P2270 DTC refers to downstream sensor (after the catalytic converter), sensor #2 on bank #1. Bank #1 is the side of the engine that contains cylinder #1. There may be a third sensor downstream, if that is the problem, a P2274 is set.when you remove the O2 sensor wire brush the O2 sensor ports so they are clean... check for any manifold/pipe leaks bolts rusted off ... just this 138 code ....138 says rich only on the driver side .. after the cat converter many times the old O2 sensor do fail 120K-140K miles... maf/injector/fuel regulator will throw other codes bank 1 sensor ...May 31, 2020 · when you remove the O2 sensor wire brush the O2 sensor ports so they are clean... check for any manifold/pipe leaks bolts rusted off ... just this 138 code ....138 says rich only on the driver side .. after the cat converter many times the old O2 sensor do fail 120K-140K miles... maf/injector/fuel regulator will throw other codes bank 1 sensor ... P0013 code on Chevy Malibu is like. Exhaust “B” Camshaft Position Actuator Circuit/Open (Bank 1) This code is related to “Variable Valve Timing” (VVT) or “Variable Camshaft Timing” (VCT) components. Sometimes, you might get the P0014 code for also. The VVT system’s main component is the camshaft actuator.Labor: 1.0. The cost to diagnose the P013A Chevrolet 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. Oct 25, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0138 Saving Repair Parts... Code P0131 is a result of the oxygen sensor incorrectly detecting the air/fuel ratio of the exhaust. This ratio is sent to the ECM which uses this data, along with comparisons to the outside air, to regulate the air to fuel ratio needed by the engine. This code is the result of this ECM detecting either a voltage outside of the specified range ...Service Manager, Service T... Associate Degree General... 1,402 satisfied customers. 2015 chevy cruze p0138, p0140, p013e. Found that the. 2015 chevy cruze p0138, p0140, p013e. Found that the downstream o/2's loom was riding on the axle boot and rubbed wires in two. replaced o/2 … read more.May 28, 2022 · Labor: 1.0. To diagnose the P2271 Chevrolet 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. P0138 คำอธิบาย. ความร้อน เซนเซอร์ออกซิเจน 2 (HO2S) (เซ็นเซอร์ O2 ด้านหลัง) หลังจากตัวเร่งปฏิกิริยาสามทาง (ท่อร่วม) ตรวจสอบระดับออกซิเจน ... Thank you for holding, The common cause for the fault code P0138 to set on your 2010 Malibu with the 2.4 engine is in most cases due to a failed HO2S( Bank 1 Sensor 2) but before you consider replacing it there is some testing that you can do to verify if, in fact, that is the case. I have enclosed the testing steps in the first link below.

May 27, 2022 · To diagnose the P0138 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.

SKU: 12633238. Other Names: ECM. Description: This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle Dictates the operation of your vehicle's vital systems, which is critical to the performance of your vehicle This GM ...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0138 Saving Repair Parts...SKU: 12633238. Other Names: ECM. Description: This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle Dictates the operation of your vehicle's vital systems, which is critical to the performance of your vehicle This GM ...Labor: 1.0. The cost to diagnose the P0131 Chevrolet 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. Search for P0131 Chevrolet Questions and Answers: Search ...01 dodge durango P0141-0132-0138 Help!!! 2001 dodge durango, 5.9, 139,000 miles, after trip up to phoenix, engine light came on, rough idle, started stalling, chugging, misfiring, scan revealed P0141, P0132, P0138, replaced first O2 sensor before cat, engine light still on, and same codes. Going to replace 2nd O2 sensor after cat, any ide...31 posts · Joined 2022. #1 · Sep 23, 2022. 2015 LTZ - I was reading the other day on Cars.com a question someone had about replacing the O2 sensors on their 2015 Malibu 2.5L. As I was reading the response, I noticed a couple of things mentioned sounded like my car. I've got 99K and change on my engine and am thinking I should replace the top ...Variable Valve Timing Code Code p0010, p0012, p0013, p0014, p0028 p0011 timing over advanced Variable valve timingPocket Scan Tool: https://amzn.to/2GlbzzY L...(My 2.4L LE5, Tuned, harness all cleaned up and redone) Bank 1 O2 Sensor 1 & Sensor 2 The Gen 7 2008-2012 Chevy Malibu with the 2.4L ECOTEC engine has two O2 sensors from GM. The first one is located on the drivers side on the exhaust manifold and is known as: Upstream O2 Sensor (Bank 1 , Sensor 1) This first priority of the upstream O2 …Dec 12, 2017 · The codes are for the intake cam actuator solenoid. Basically the intake cam is not advancing when it should and it sets the code. This could be low oil, the solenoid itself or a problem with the wiring. The P0011 is just a code that shows it out of range. Repair the solenoid to resolve both codes. 70K views 3 years ago FIX CODE P0036 P0054 P0137 P0138 P0141 ENGINE LIGHT CHEVY, CHEVROLET, GMC, BUICK, CADILLAC Car Scanner: https://amzn.to/2G5lxTi ...more ...more Shop the Auto Repair Guys...

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The intake air temperature (IAT) is between –20°C and +200°C (-4 and +392°F). The start up engine coolant temperature is warmer than –20°C (–4°F). The fuel control intrusive diagnostics are not active. The engine is operating under light acceleration, heavy acceleration, or cruise conditions.Soluzioni di codice P0138 OBDII Chevrolet. Prova le soluzioni indicate nel codice generico P0138, troverai sicuramente la soluzione adatta per il tuo veicolo Chevrolet. Cause del codice DTC P0138 Chevy. Le cause saranno legate ai componenti coinvolti nel funzionamento del sensore O2 a valle, tra cui:P0138 : Heated oxygen sensor (HO2S) 2, bank 1 -high voltage: Wiring short to positive, H025, ECM: P0139 : Heated oxygen sensor (HO2S) 2, bank 1 -slow response: Heating inoperative, wiring, H028: P013A: O2 Sensor Slow Response - Rich to Lean-P013B: O2 Sensor Slow Response - Lean to Rich-P013C: O2 Sensor Slow Response - Rich to Lean …May 28, 2022 · Labor: 1.0. To diagnose the P013E Chevrolet 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. Chevy Malibu P0068 Causes + Diagnosis. Make sure to check for any other OBDII codes. If there’s a code related to one of the sensors listed below, start your search there. Below are the most common causes of P0068 in a Malibu. 1. Vacuum Leak. It can be tough to find a vacuum leak in this mess. Vacuum leaks are known to throw P0068. …What is the Cost to Diagnose the Code P0401 Chevrolet? Labor: 1.0. The cost to diagnose the P0401 Chevrolet 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.What is the Cost to Diagnose the Code P0140 Chevrolet? Labor: 1.0. The cost to diagnose the P0140 Chevrolet 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.code p0138 engine light on - Chevrolet 2010 Aveo question. Search Fixya. Browse Categories ... DTC P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2) ….

What is the Cost to Diagnose the Code P013E Chevrolet? Labor: 1.0. The cost to diagnose the P013E Chevrolet 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.Help I need a wiring diagram 4 a 2013 Chevy Malibu eco 2.4L. Back to Top. lurch228 . Silver - Posts: 1,338. Joined: August 08, 2012. Posted: September 19, 2016 at 12:02 AM / IP Logged Here's the 2 that I posted and a 3rd by someone else. 2013 Chevrolet Malibu Smart Key Wiring . 2013 Chevrolet Malibu Wiring . 2013 Chevrolet Malibu.What does this mean? Code P0138 Tech Notes Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem. User Submitted Video ⚠ Does your Car have Safety Recalls? → Check here How to Fix the DTC P0138? Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors.P1407 EGR Air Intrusion In Exhaust Supply To EGR Valve - Read Our Article on EGR Valve Codes For Help With This Chevy Check Engine Light Code. P1408 Intake Manifold Pressure Sensor Circuit. P1409 EGR Vacuum System Leak - Read Our Article on EGR Valve Codes For Help With This Chevy Check Engine Light Code.The most common symptom of a P0128 trouble code in a Chevy Malibu is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Chevy Malibu is the lack of heat. When the thermostat …Dec 1, 2022 · According to a recent report from GM TechLink, some 2018 through 2022 Chevy Malibu vehicles may exhibit reduced engine power and one or more diagnostic trouble codes (DTCs) as the result of the ... What is the Cost to Diagnose the Code P0401 Chevrolet? Labor: 1.0. The cost to diagnose the P0401 Chevrolet 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.AutoEclinic 25.9K subscribers 923K views 11 years ago Emission & Evap Manufacturers constantly strive to build their vehicles to meet tougher emission standards each year. This can be a nightmare... P0138 chevy malibu, Chevy S10 P0138 Symptoms. Typically, the only symptom of P0138 is going to be the service engine soon light. In some cases, there can be other symptoms as well. These symptoms include: ... Chevy Malibu P0138: Oxygen Sensor High Voltage (Bank 1 -Sensor 2) Chevy Silverado P0138: Oxygen Sensor High Voltage (Bank 1 -Sensor 2) ..., 0:00 / 2:27 How to Fix P0138 Engine Code in 3 Minutes [2 DIY Methods / Only $8.99] nonda 76.1K subscribers 141K views 2 years ago UNITED STATES ============================= Claim your FREE..., 2011 Silverado 2500hd with a 6.0 cats stolen and already replaced also added a new pig tail on sensor 2 bank 2 has a code p2273 p0158 p0138 p2271 … read more Ian Crabtree, P0132 is a common OBDII code that occurs in many vehicles, including the Chevy Malibu. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. The air fuel sensor stays in rich biased mode for too long. There are also some less likely problems that can., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0131 Saving Repair Parts..., Labor: 1.0. The cost to diagnose the P013E Chevrolet 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., El código P0138 es común en: Chery, Chevrolet Aveo, Chrysler Town & Country, Dodge Dakota, Dodge Neon, Dodge Ram 1500, Dodge Stratus, Ford Explorer, Ford ..., To diagnose the P0138 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., Dec 14, 2019 · P0140 P0138 Code Chevy Truck, If you have a P0140 or a P0138 code in your chevy truck this video is for you. I will be showing you a few things you should ch... , P0138 Code: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) - In The Garage with CarParts.com P0138 is the OBD-II code that is recorded when a high voltage signal is detected from the downstream oxygen sensor in bank 2. Read on for more., The car debuted with a mild-hybrid system teamed to a four-cylinder called the Chevrolet Malibu Eco that returns 37 mpg on the highway. We reviewed that powertrain earlier this year. The world ..., Illuminated - DTC P0132 and/or P0138 Set Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Equinox 2018 2019 GMC Terrain 2018 2019 All All Holden Equinox 2018 2019 Involved Region or Country North America, N.A. Export Regions, Australia Additional Options (RPOs) Condition, After my TCM issue was fixed, 3 codes remained. P0036, P0141 and P0054. (I also occasionally get P1818 and my dash doesn't show when I'm in park, drive, etc. but that's CURRENTLY working at least). I had my O2 sensor replaced (Bank 1, sensor 2) with an AC Delco. No luck., Jul 31, 2012 · zblue1 Discussion starter · #5 · Aug 1, 2012 (Edited) Re: code P2138, P2138 P Resolved. Thanks for the info & pic. Since it was a powertrain/warranty related issue, I had the local dealer check it out. They checked I/P to body harness connector-OK. They came up with the same codes and an internal throttle position sensor fault (9094) remedy ... , The most common signs of bad O2 sensor in Chevy Malibu are slow acceleration, loss of power, irregular idling, engine hesitation or jerking when accelerating, high fuel consumption, higher tailpipe emissions, foul odor from exhaust, check engine light illuminates, and sometimes stalling., Labor: 1.0. The cost to diagnose the P0405 Chevrolet 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., SKU: 12633238. Other Names: ECM. Description: This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle Dictates the operation of your vehicle's vital systems, which is critical to the performance of your vehicle This GM ..., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0137 Saving Repair Parts..., P0138 is a common OBDII code that occurs in many vehicles, including the Chevy Silverado. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. There are also some less likely problems that can cause P0138., P0137 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 is failing to increase the voltage output above .21 volts indicating excessive oxygen in the exhaust. This code occurs when the engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 below .21 volts when the ECM has commanded the fuel to a ..., Code P0138 is triggered when the powertrain computer or PCM determines that the rear oxygen sensor voltage remained above 450 millivolts for more than twenty seconds (varies with vehicle make and model) or that the air fuel ratio sensor remained in a rich-biased mode for too long (varies with vehicle make and model). , Code P0442 Chevrolet Tech Notes. The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is the most common cause that will trigger the P0442 code. There is a factory service bulletin for all the models from 2000 through 2021. The factory states that there …, P0138 is a common OBDII code that occurs in many vehicles, including theChevy Malibu. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more Voltage to..., P0138. DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0201, P0202, P0203, P0204, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496 are not set. The Loop Status parameter is Closed. ... I have a 09 chevy malibu with a 2.4l engine. The engine light is on. I have had a code check ran on it and it came back as the …, Replacement of camshaft actuator exhaust and intake on a 2011 Chevy Malibu. Not endorsed by any of the manufacturers you see in the video., P0138 is a common OBDII code that occurs in many vehicles, including the Chevy Captiva. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. There are also some less likely problems that can cause P0138., Código P0138 Chevrolet Descripción del código de falla P0138 Chevrolet . Se arroja en el escáner automotriz cuando la computadora del vehículo detecta un alto voltaje en el circuito del sensor de O2 aguas abajo ubicado en el banco 1. Qué significa el código P0138 Chevrolet en español, 16 sept. 2022 ... 1K Likes, TikTok video from The Maryland Mechanic (@themarylandmechanic): "Chevy Malibu loose intake manifold #MechanicTikTok ..., Diagnostic trouble code (DTC) P0138 stands for O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). The code will set when your car’s primary computer—also called the powertrain control module (PCM)—detects that, for a given period of time, the voltage signal from the rear O2 sensor is too high., To diagnose the P0138 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 …, P0135 is a very common OBDII code that occurs in the Chevy Malibu. It is caused by a failure in one of the oxygen sensors heated elements, specifically bank 1 sensor 1. It technically stands for: P0135: Heated Oxygen Sensor → Sensor Heater Circuit Malfunction → Bank 1, Sensor 1. The purpose of the heated element in the oxygen sensor is to ..., The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S voltage is greater than 1, 050 mV. P0158 ..., P0138 Code (Symptoms, Causes, and How to Fix) When your check engine light comes on, it can mean anything from a catastrophic issue with the motor itself to a loose sensor connection. That’s why it’s crucial to run the codes and see what’s going on underneath the hood. Code P0138 indicates an issue with the O2 sensor for Bank 1, Sensor 2.