The P0161 trouble code indicates a malfunction in the oxygen (O2) sensor heater circuit of bank 2 sensor 2. This code typically points to issues related to the heating element within the oxygen sensor positioned after the catalytic converter, helping the sensor reach operating temperature faster for optimal performance.
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
Code symptoms P0161.
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 P0161.
1. Faulty oxygen (O2) sensor heater.
2. Wiring or connector issues within the sensor circuit.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0161.
1. Replace the oxygen (O2) sensor if the heater 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.