- Do It Yourself Auto Repair
Engine Sensor Failure in a 2005+ Volkswagen
The Volkswagen 2005+ car has 16 sensors in the engine area, all fed into the car's computer module for instant measurement and adjustment. No different than most 2000+ cars. Usually, if the sensor fails, there is reading taken by another sensor that is fed into the computer. For instance, the Camshaft Position Sensor (G40) is attached to the toothed belt guard wheel below the camshaft gear. It scans seven teeth on the camshaft sensor wheel. If it fails, the engine control module computer will use the Engine Speed Sensor (G28) instead. However, if the G28 fails, the engine will turn off because the sensor provides both the engine speed and the exact position of the crankshaft. This ties into the injection point and amount of fuel to be used. This sensor is attached to the cylinder block. Also, cars with a manual transmission have a Clutch Vacuum Vent Valve Switch in the pedal, if this fails, shuddering will occur if the clutch is engaged or when shifting gears.
There is an accelerator sensor called the Throttle Position Sensor (G79) built into the pedal to regulate fuel. If the sensor fails, the engine will only idle had high RPM. The Intake Manifold and Intake Air Temp sensors both improve engine performance, if either one fails, such performance will be noticed.