Mercedes GLA Engine Issues and Camshaft Sensor

I had a similar issue with my 2018 Volvo XC60 (gasoline engine) where the car stalling was related to the camshaft position sensor. The engine control system relies heavily on this sensor for proper ignition timing and fuel delivery. When the sensor malfunctions, it can lead to poor starting, idling problems, and engine misfire. A defective encoder wheel is a likely cause. I would suggest carefully checking the wiring and connectors to the sensor first. Sometimes, a loose connection or damaged wire can mimic a sensor failure. Sensor testing can be done with a multimeter to check for proper signal output, but it might require a professional scan tool to properly interpret the results. If it's indeed the sensor, replacing it should resolve the issue.

When you mention sensor testing with a multimeter, could you elaborate on the specific parameters I should be measuring and the expected values? Also, if the encoder wheel is indeed the root cause, is this typically rectified by replacing the sensor, or does it necessitate a more involved mechanical intervention?

Regarding sensor testing with a multimeter, you would typically measure the voltage output of the sensor while the engine is running or cranking. The specific voltage range will depend on the sensor type and your Mercedes' specifications. Your best bet is to consult the service manual for your specific engine. As for the encoder wheel, it is usually integrated with the camshaft. If it's defective, replacing the camshaft or the entire sensor including the wheel is often the only solution. Given the potential complexities involved, it's probably prudent to have a trusted workshop diagnose the issue definitively. They can confirm whether it's a faulty sensor, wiring problem, or something else entirely causing your car stalling and engine misfire.

I appreciate your feedback and guidance. It appears that engaging a qualified workshop is indeed the most judicious course of action. I shall proceed accordingly and report back with the resolution for the benefit of the community. The assessment confirmed the camshaft sensor was defective, and the encoder wheel needed replacement. The repair cost was, as anticipated, 695€. The ignition timing is now correct, and the car is behaving normally.