OBD2 Error Code P0155: How to Fix It

Q: Can I drive with P0155 error code?

You can drive with P0155, but it will affect fuel economy and emissions. The engine may run rich, causing increased fuel consumption and potential catalytic converter damage over time.

Q: How much does it cost to fix P0155?

Repair costs typically range from $150-400, with most being O2 sensor replacement ($50-200 for parts plus labor). Wiring repairs may cost less, while PCM replacement would be significantly more expensive.

Q: What causes P0155 error code?

Common causes include a faulty O2 sensor heater element, damaged wiring to the sensor, poor electrical connections, blown fuses, or rarely, a faulty PCM.

Q: How do I know which bank is Bank 2?

Bank 2 is the side of the engine that does not contain cylinder #1. In V6 and V8 engines, this is typically the passenger side, but always consult your vehicle's service manual for confirmation.

Abstract

OBD2 error code P0155 indicates a malfunction in the oxygen sensor heater circuit for Bank 2 Sensor 1, which is located downstream of the catalytic converter on the side of the engine opposite cylinder #1. This error occurs when the PCM detects that the O2 sensor heater is not warming up properly, affecting fuel efficiency and emissions performance.