Posts Tagged: P0155 code

P0155 Code: Causes, Symptoms, and P0155 Repair Cost

Understanding the P0155 Code and Typical Repair Costs Quick Summary The P0155 code is a common diagnostic trouble code indicating a problem with the oxygen sensor heater circuit on Bank 1, Sensor 1. In simple terms, the engine computer has detected that the heater element inside the upstream oxygen sensor is not working properly. This heater is critical because it brings the sensor up to operating temperature quickly, allowing the engine computer to accurately control the air-fuel mixture. The most common causes of a P0155 code include a failed oxygen … Read More