BMW DTC P135C – Knock/Combustion Vibration Sensor 2 Circuit (Bank 1)
DTC P135C meaning on BMW
The DTC P135C code on a BMW indicates an issue with the Knock/Combustion Vibration Sensor 2 Circuit on Bank 1. This sensor is responsible for detecting abnormal combustion or knocking in the engine, which can lead to poor performance and potential damage if not addressed.
BMW DTC P135C symptoms
Symptoms of a DTC P135C on a BMW may include engine misfires, rough idling, reduced power, increased fuel consumption, and potentially even engine knocking noises. The vehicle’s check engine light may also illuminate to indicate a problem.
BMW DTC P135C causes
The DTC P135C code on a BMW can be triggered by various factors, including a faulty Knock/Combustion Vibration Sensor 2, wiring issues in the sensor circuit, or problems with the engine control module (ECM). Additionally, poor fuel quality or incorrect ignition timing can also contribute to this fault code.
BMW DTC P135C seriousness
Ignoring a DTC P135C on a BMW can lead to decreased engine performance, potential engine damage, and increased emissions. It is important to address this issue promptly to prevent further complications and ensure the vehicle operates efficiently.
How to diagnose DTC P135C on BMW
To diagnose a DTC P135C on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and perform a thorough inspection of the Knock/Combustion Vibration Sensor 2 and its circuitry. They may also check for any related wiring issues or ECM malfunctions that could be causing the problem.
How to fix DTC P135C on BMW
Fixing a DTC P135C on a BMW may involve replacing the faulty Knock/Combustion Vibration Sensor 2, repairing any damaged wiring in the sensor circuit, or addressing any ECM issues. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure the problem is resolved correctly.
How to erase DTC P135C on BMW
Once the underlying issue causing the DTC P135C on a BMW has been fixed, the fault code can be cleared using a diagnostic scanner. By erasing the code, the vehicle’s ECM will reset and monitor the system for any recurring faults. It is important to verify that the issue has been resolved before clearing the code.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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