BMW DTC P264A – ‘A’ Rocker Arm Actuator Position Sensor Circuit (Bank 1)
DTC P264A meaning on BMW
DTC P264A indicates a fault in the ‘A’ Rocker Arm Actuator Position Sensor Circuit on Bank 1 in a BMW vehicle. This fault is related to the sensor that monitors the position of the rocker arm actuator, which is responsible for controlling the variable valve timing system.
BMW DTC P264A symptoms
Symptoms of DTC P264A in a BMW may include rough idling, reduced engine performance, decreased fuel efficiency, and in some cases, the vehicle may go into a limp mode where power is limited to prevent further damage.
BMW DTC P264A causes
The most common causes of DTC P264A in a BMW are a faulty rocker arm actuator position sensor, wiring issues in the sensor circuit, or a malfunction in the engine control module (ECM) that is responsible for monitoring the sensor.
BMW DTC P264A seriousness
While DTC P264A may not cause immediate harm to the engine, it can lead to reduced engine performance and efficiency if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P264A on BMW
To diagnose DTC P264A on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the rocker arm actuator position sensor and its wiring. They may also conduct tests to check the sensor’s functionality and the ECM’s ability to communicate with it.
How to fix DTC P264A on BMW
Fixing DTC P264A on a BMW usually involves replacing the faulty ‘A’ Rocker Arm Actuator Position Sensor and addressing any wiring issues in the sensor circuit. In some cases, reprogramming or replacing the engine control module (ECM) may be necessary to ensure proper communication with the new sensor.
How to erase DTC P264A on BMW
Once the underlying issue causing DTC P264A has been fixed, the fault code can be erased using a diagnostic scanner. This will clear the code from the ECM’s memory and turn off the check engine light, indicating that the problem has been resolved.
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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