P0156 Code - O2 Sensor Circuit Malfunction Bank 2 Sensor 2

What Does P0156 Mean?

An oxygen sensor for a one particular engine bank has delivered a voltage signal that is not within the accepted parameters, causing the PCM to store a trouble code and possibly illuminate the service engine soon light. Bank 2 typically denotes the engine bank of the engine block that does not contain the number 1 cylinder. S2 tells you that the fault is found in sensor 2, or the downstream sensor (aft of the catalytic converter/s).

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What are the common causes of P0156 ?

• Gas leaks in the exhaust
• Air leaks in the intake
• Defective fuel injectors
• Broken or exposed wires
• Voltage wires or circuits that have shorted out
• Exhaust holes that are located near or around the oxygen sensor
• Engine vacuum leaks
• Oxygen sensor wires touching the exhaust

What are the symptoms of P0156 ?

Symptoms of a P0156 diagnostic trouble code may include:

• Excessive exhaust leak
• Hesitation upon acceleration
• Malfunction Indicator Lamp (MIL) illuminated
• Diminished fuel efficiency

How do you troubleshoot P0156 ?

Repairs for this error code of course, are as easy and as straightforward as its diagnosis, which are:

• Repair of vacuum leaks
• Repair broken, shorted or exposed O2 sensor wires
• Repair exhaust damage as needed
• Replace faulty fuel injector
• Replace the O2 sensor Bank 2 sensor 2
• Though not really considered as a serious trouble code, P0156 can definitely increase the vehicle’s fuel consumption and can cause it to release excessive air pollutants into the air.

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