P0153 Aging of oxygen sensor ahead of catalytic converter P0154 Oxygen sensor ahead of catalytic converter P0156 Oxygen sensor after catalytic converter P0157 Oxygen sensor after catalytic converter P0158 Oxygen sensor after catalytic converter
Okay, let's break down those OBD-II trouble codes: These codes (P0153, P0154) refer to issues specifically with the **Oxygen sensor located ahead of the catalytic converter**, which is part of your vehicle's exhaust system monitoring for emissions control. Here's a breakdown of each code you mentioned: ### P0153: Oxygen Sensor Circuit Malfunction - Bank 1, Sensor 2 (Aging/Poor Signal) or similar variations * This refers to an issue detected by the PCM in the circuit for the **Oxygen sensor located ahead of the catalytic converter**. * It monitors oxygen levels *before* passing through your catalytic converter. ### P0154: Oxygen Sensor Voltage High (Bank 2, Sensor 2) - Bank 2 The codes **P0153**, **7**, and **8** all relate to the upstream (ahead of catalyst) O₂ sensors. Here's what each specific code means: | Code | Description | |------|-------------| | P0154 | Oxygen sensor circuit high input detected for bank 1, sensor 2 (upstream). | ### Key Points * ...