BMW DTC P266C – ‘A’ Rocker Arm Actuator Position Sensor Circuit Low (Bank 2)
DTC P266C meaning on BMW
DTC P266C on a BMW indicates a fault with the ‘A’ Rocker Arm Actuator Position Sensor Circuit on Bank 2. This fault code is specific to BMW vehicles and is related to the variable valve timing system.
BMW DTC P266C symptoms
Symptoms of DTC P266C on a BMW may include rough idling, reduced engine performance, engine misfires, and in some cases, the vehicle may go into a limp mode where power is limited.
BMW DTC P266C causes
The most common causes of DTC P266C on a BMW are a faulty ‘A’ Rocker Arm Actuator Position Sensor, wiring issues in the sensor circuit, or a problem with the engine control module (ECM).
BMW DTC P266C seriousness
While DTC P266C may not cause immediate harm to the vehicle, it can lead to poor engine performance and reduced fuel efficiency. Ignoring this fault code can potentially cause further damage to the engine over time.
How to diagnose DTC P266C on BMW
To diagnose DTC P266C on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the ‘A’ Rocker Arm Actuator Position Sensor and its wiring. Testing the sensor’s resistance and checking for any loose connections or damaged wires can help pinpoint the issue.
How to fix DTC P266C on BMW
Fixing DTC P266C on a BMW usually involves replacing the faulty ‘A’ Rocker Arm Actuator Position Sensor. Additionally, repairing any damaged wiring or connectors in the sensor circuit may be necessary. Once the repairs are made, the fault code should be cleared from the ECM.
How to erase DTC P266C on BMW
To erase DTC P266C on a BMW, a diagnostic scanner can be used to clear the fault code from the engine control module. After the repairs have been completed and the issue resolved, clearing the fault code will reset the system and turn off the check engine light.
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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