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The BMW P13B6 fault code is linked to a problem with the crankshaft position sensor that monitors the crank's movement. When the onboard diagnostics detect speed data that doesn't match the crankshaft's expected range, this error code is triggered. Typically, this indicates a need to replace the sensor or repair faulty wiring, connectors, or harness. You may also see the "check engine" light come on with this code. If the crankshaft position sensor fails, you might notice issues like intermittent stalling, trouble starting, uneven acceleration, misfiring, and engine vibrations. The cost of replacing the CKS in a BMW ranges from $270 to $350 for parts and labor.
In a BMW, if you see the code P13B6, it indicates an issue with the camshaft position sensor.
I've replaced both the camshaft sensor and crankshaft sensor, and I might have to replace the cam variable timing gears once more. I just did this maintenance in August 2021, and it's frustrating dealing with these components.