P0156 Chevrolet Code - Heated Oxygen Sensor Circuit Malfunction Bank 2 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 2 Sensor 2, Heated Oxygen Sensor Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 2 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
- P0156 Chevrolet indicates Heated Oxygen Sensor Circuit Malfunction Bank 2 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor Bank 2 Sensor 2, Heated Oxygen Sensor Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 2 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 P0156 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 P0156 Chevrolet?
- Faulty Heated Oxygen Sensor Bank 2 Sensor 2
- Heated Oxygen Sensor Bank 2 Sensor 2 harness is open or shorted
- Heated Oxygen Sensor Bank 2 Sensor 2 circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P0156 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 P0156 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.
Need more information about the P0156 Chevrolet code?
Need more information on how to fix the P0156 Chevrolet code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0156 Chevrolet code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0156 Chevrolet Code
1. What are the common symptoms of OBDII code P0156 in a Chevrolet?
- Common symptoms include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light.
2. What does the OBDII code P0156 in a Chevrolet indicate?
- The code indicates a malfunction in the heated oxygen sensor circuit for Bank 2 Sensor 2 in the vehicle's exhaust system.
3. What are the possible causes of a P0156 code in a Chevrolet?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the vehicle's powertrain control module.
4. How can I diagnose a Heated Oxygen Sensor Circuit Malfunction Bank 2 Sensor 2 issue in my Chevrolet?
- Diagnosing the issue typically involves using an OBDII scanner to read the code, inspecting the sensor and its wiring for damage, and testing the sensor's operation.
5. Can I drive my Chevrolet with a P0156 code present?
- It is generally not recommended to drive the vehicle with a P0156 code present, as it can lead to decreased fuel efficiency and potential engine performance issues.
6. How can I repair a P0156 code in my Chevrolet?
- Repairing the issue may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or reprogramming the powertrain control module.
7. How much does it cost to fix a Heated Oxygen Sensor Circuit Malfunction Bank 2 Sensor 2 issue in a Chevrolet?
- The cost of fixing a P0156 code can vary depending on the specific issue, but it can range from around $100 to $300 for parts and labor.
8. Can I reset the check engine light after fixing a P0156 code in my Chevrolet?
- Yes, the check engine light can be reset using an OBDII scanner after the issue causing the P0156 code has been repaired.
9. How often should the oxygen sensors be checked in a Chevrolet to prevent a P0156 code?
- It is recommended to have the oxygen sensors inspected during regular maintenance intervals or whenever you notice symptoms of poor engine performance.
10. Is a P0156 code a common issue in Chevrolet vehicles?
- While not extremely common, a P0156 code can occur in Chevrolet vehicles, especially as they age and the oxygen sensor components wear out.
Discuss the causes and fixes for P0156 Chevrolet OBDII Code
Code P0156 Chevrolet comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
