P0156 Pontiac 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 Pontiac 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 Pontiac 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 Pontiac?
- 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 Pontiac?
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 Pontiac 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 P0156 Pontiac Code
1. What are the common symptoms of OBDII code P0156 in a Pontiac?
- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.
2. What does the OBDII code P0156 indicate in a Pontiac?
- OBDII code P0156 indicates a Heated Oxygen Sensor Circuit Malfunction on Bank 2 Sensor 2 in a Pontiac vehicle.
3. What are the possible causes of OBDII code P0156 in a Pontiac?
- Possible causes include a faulty oxygen sensor, wiring issues in the oxygen sensor circuit, exhaust leaks, or a malfunctioning catalytic converter.
4. How can I diagnose the cause of OBDII code P0156 in my Pontiac?
- You can diagnose the issue by using an OBDII scanner to read the code, inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the catalytic converter.
5. Can I drive my Pontiac with OBDII code P0156?
- It is generally safe to drive your Pontiac with code P0156, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent further damage to the vehicle.
6. How can I repair OBDII code P0156 in my Pontiac?
- Repair options may include replacing the faulty oxygen sensor, repairing any wiring issues, fixing exhaust leaks, or replacing a malfunctioning catalytic converter.
7. Is it possible to reset the OBDII code P0156 in my Pontiac without fixing the issue?
- While you can clear the code using an OBDII scanner, it will likely reappear if the underlying issue is not addressed. It's best to diagnose and repair the problem to prevent recurrence.
8. How much does it cost to fix OBDII code P0156 in a Pontiac?
- The cost of fixing code P0156 can vary depending on the root cause of the issue and whether you do the repairs yourself or take your Pontiac to a mechanic. Costs may range from $100 to $500 or more.
9. Can a DIY enthusiast repair OBDII code P0156 in a Pontiac?
- Yes, a DIY enthusiast with some mechanical knowledge and tools can potentially repair code P0156 by replacing the oxygen sensor, checking wiring, and addressing any other related issues.
10. How often does OBDII code P0156 occur in Pontiac vehicles?
- OBDII code P0156 is a relatively common issue in Pontiac vehicles, especially in older models or those with high mileage. Regular maintenance and timely repairs can help prevent this code from appearing.
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