What is the meaning of OBD-II code P0155, and what are the possible causes and solutions for this code to be generated?

The P0155 code indicates slow heating of the oxygen sensor's heater element. The PCM stores the code, and the Check Engine Light turns on to alert the driver of the issue. There are several possible causes for a P0155 code, such as: -The oxygen sensor located in bank 2, sensor 1 is not functioning correctly -There may be a damaged or missing wire connected to the oxygen sensor -The fuse in the circuit for the oxygen sensor has malfunctioned -The engine coolant temperature sensor is not functioning optimally -It is less likely, but the power control module (PCM) may also be faulty To diagnose the problem, a mechanic typically uses an OBD-II scanner to collect trouble codes and inspects the wiring leading to the oxygen sensor while also using the scanner to view live data. In rare cases, they may consider a defective PCM as the issue only after all other repair attempts have failed. The resolution to the P0155 code depends on the root cause but may involve fixing broken or bare wires, replacing the coolant temperature sensor and oxygen sensor, or replacing the PCM if needed. It's important to note that removing the oxygen sensor can be challenging without an oxygen sensor set and propane tank. Access to the sensor may vary in different vehicles, and it may need a heating element if it's stuck in the exhaust.