Engine internals
Camshaft position sensor
Reports camshaft position so timing can be checked and adjusted.
At the cylinder head near the camshaft trigger wheels.
Its signal identifies the cylinder cycle and lets VANOS control measure actual cam timing.
A second clock that confirms which stroke the engine is on.
Timing correlation faults or rough running can involve sensors, wiring, oil supply or the timing drive.
Usually condition-based rather than a routine replacement. Lubrication, overheating and the exact engine affect wear.
Internal-engine work is usually labor-intensive. Diagnosis and the engine code determine the repair scope.
Each VANOS-equipped camshaft on a BMW engine typically has its own sensor.
BMW petrol and diesel engines; petrol-only systems are identified individually.
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