The P0156 trouble code indicates a malfunction within the oxygen (O2) sensor circuit of bank 2 sensor 2. This code typically points to issues related to the oxygen sensor positioned after the catalytic converter, monitoring the oxygen content in the exhaust gas, and aiding in emission control.
O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
Code symptoms P0156.
1. Poor fuel efficiency.
2. Engine performance issues.
3. Malfunction indicator light (MIL) illumination.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0156.
1. Faulty oxygen (O2) sensor.
2. Wiring or connector issues within the sensor circuit.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0156.
1. Replace the oxygen (O2) sensor if it is faulty.
2. Check and repair any wiring or connector issues in the sensor circuit.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.