P0155 Code - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1

What Does P0155 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 P0155 ?

To sum things up, the common causes for code P0155 are as follows:

• Problem on the ground side of the O2 sensor heater circuit
• Problem on the power side of the O2 sensor heater circuit
• O2 sensor heater element has high resistance
• O2 sensor heater element has an open circuit

What are the symptoms of P0155 ?

Symptoms of a P0155 diagnostic trouble code may include:

• Blown fuse (if applicable)
• Engine surge
• Reduction in engine performance, especially at low RPM levels
• The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

How do you troubleshoot P0155 ?

• Fix broken wires or bare wires
• Replace the coolant temperature sensor
• Replace the oxygen sensor
• Replace the power control module (PCM), in the rare case that it is necessary

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