P0136 Chevrolet Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
Quick Answer
Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0136 Chevrolet indicates Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0136 Chevrolet Description
The HO2S bank 1 sensor 2 and HO2S bank 2 sensor 2 are used for catalyst monitoring. This diagnostic runs once per ignition cycle. This diagnostic consists of two tests, a passive test, and an intrusive test. During the passive test, if the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 voltage transitions below 350 mV and above 709 mV, the DTC will pass for this ignition cycle. If the DTC does not pass during the passive test, the intrusive test will begin. During the intrusive test, the control module will force the air-to-fuel ratio rich and/or lean. The control module then waits for a predicted response from the HO2S. If the HO2S voltage transitions below 350 mV and/or above 709 mV, the DTC will pass for this ignition cycle. If the control module does not receive the expected response from the HO2S, DTC P0136 will set for HO2S bank 1 sensor 2 or DTC P0156 will set for HO2S bank 2 sensor 2.
What are the Possible Causes of the DTC P0136 Chevrolet?
- Faulty Heated Oxygen Sensor Bank 1 Sensor 2
- Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P0136 Chevrolet?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0136 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0136 Chevrolet Code
1. What are the common symptoms of OBDII code P0136 in a Chevrolet?
- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.
2. What does the OBDII code P0136 "Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2" mean?
- This code indicates a problem with the heated oxygen sensor (HO2S) located downstream of the catalytic converter on bank 1 of the engine.
3. What are the possible causes of the P0136 code in a Chevrolet?
- The P0136 code can be caused by a faulty HO2S, wiring issues, exhaust leaks, a failed catalytic converter, or an issue with the engine's fuel system.
4. How can I diagnose the cause of the P0136 code in my Chevrolet?
- Diagnosis typically involves checking the HO2S for proper operation, inspecting the wiring for damage, looking for exhaust leaks, and testing the catalytic converter and fuel system components.
5. Can I drive my Chevrolet with the P0136 code present?
- It is generally safe to drive your vehicle with the P0136 code, but it is recommended to address the issue promptly to prevent further damage and ensure optimal performance.
6. How difficult is it to repair the P0136 code in a Chevrolet?
- Repairing the P0136 code usually involves replacing the faulty HO2S, repairing any damaged wiring, fixing exhaust leaks, or addressing issues with the catalytic converter or fuel system, which can vary in difficulty.
7. Are there any DIY tips for fixing the P0136 code in a Chevrolet?
- DIY enthusiasts with automotive experience can attempt to replace the HO2S themselves, but diagnosing and repairing other potential causes of the code may require professional assistance.
8. Will resetting the check engine light clear the P0136 code in a Chevrolet?
- Resetting the check engine light may temporarily clear the code, but it will likely return if the underlying issue causing the P0136 code is not addressed.
9. Can a faulty HO2S cause other problems in a Chevrolet besides triggering the P0136 code?
- Yes, a faulty HO2S can impact fuel efficiency, emissions, and overall engine performance in addition to triggering the P0136 code.
10. How much does it typically cost to repair the P0136 code in a Chevrolet?
- The cost of repairing the P0136 code can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.
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