BMW DTC P135B – Knock/Combustion Vibration Sensor 2 Circuit Range/Performance (Bank 1)
DTC P135B meaning on BMW
The DTC P135B code on a BMW indicates a Knock/Combustion Vibration Sensor 2 Circuit Range/Performance issue in Bank 1. This means that the engine control module (ECM) has detected a problem with the sensor responsible for monitoring knock or combustion vibrations in the engine.
BMW DTC P135B symptoms
Symptoms of a DTC P135B code on a BMW may include engine knocking or pinging noises, reduced engine performance, rough idling, and potentially even engine misfires. The Check Engine Light may also illuminate on the dashboard.
BMW DTC P135B causes
The causes of a DTC P135B code on a BMW can vary, but common reasons include a faulty knock sensor, wiring issues in the sensor circuit, poor electrical connections, or a problem with the sensor itself. Additionally, engine mechanical problems or issues with the fuel system could also trigger this fault code.
BMW DTC P135B seriousness
Ignoring a DTC P135B code on a BMW can lead to potential engine damage or reduced fuel efficiency. It is important to address this issue promptly to prevent further complications and ensure the proper functioning of the engine.
How to diagnose DTC P135B on BMW
To diagnose a DTC P135B on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the knock sensor and its wiring. They may also conduct tests to check the sensor’s resistance and functionality to pinpoint the exact cause of the issue.
How to fix DTC P135B on BMW
Fixing a DTC P135B code on a BMW usually involves replacing the faulty knock sensor, repairing any damaged wiring or connectors, or addressing any underlying engine issues that may have triggered the fault code. Once the necessary repairs are made, the code should be cleared from the ECM.
How to erase DTC P135B on BMW
To erase a DTC P135B code on a BMW, a mechanic can use a diagnostic scanner to clear the code from the ECM’s memory. After the repairs have been completed and the issue resolved, the code can be erased to turn off the Check Engine Light and ensure that the fault has been successfully addressed.
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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