How do I fix code P0155?
What repairs can fix the P0155 code?
- 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.
What is a rear oxygen sensor?
Rear Oxygen Sensor A rear or downstream oxygen sensor is installed in the exhaust after the catalytic converter. It measures the amount of oxygen in the exhaust gases coming out of the catalytic converter. The signal from the rear oxygen sensor is used to monitor the efficiency of the catalytic converter.
What causes code P0155?
Code P0155 occurs when the powertrain control module tests the upstream heated oxygen sensor’s heater circuit on Bank 2 and detects a short in the circuit or excessive resistance in the heater circuit.
Is Bank 2 upstream or downstream?
Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. Many buyers brought the wrong Oxygen Sensor because they donot pay attention to the plug and the length of the sensor.
What does the Check Engine code p0155 mean?
If it detects an issue in the heater circuit for the engine bank 2’s oxygen sensor, it activates the Check Engine Light and sets the P0155 code. Vehicles that are prone to code P0155 include various models of Jeep (especially Jeep Grand Cherokee), Chevrolet, Ford, GMC, and Toyota.
Can a ho2s heater cause a p0155 code?
From an open HO2S heater ground circuit to a defective HO2S heater, many issues can trigger the P0155 code. Unless you are an automotive expert, making an accurate diagnosis can be difficult. So it’s best to let a professional handle the task.
What does the code mean on the O2 sensor?
The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up.