The Volkswagen Jetta Camshaft Position Sensor is the watchdog of the engine, which relays real-time data regarding the camshaft to the electronic brain to ensure combustion occurs at the highly appropriate time. The sensor allows the engine control module to pulse the fuel injectors and start the spark at the right moment each cylinder requires, keeping the power smooth and the emissions at a minimum by monitoring the position and rotational speed of the camshaft. The current Volkswagen engines rely on this feedback mechanism to have a smooth idling mode and a quick start. The majority of the units are mounted slightly above the camshaft, although some engines may mount the device behind the cylinder head, and a few can be mounted close to the block; thus, the placement of the device may vary depending on the model year. In each location the target remains constant to equalize the movement of the valves with the motion of the piston. The Camshaft Position Sensor constantly communicates with the crank sensor, which in turn adjusts the four-stroke cycle during startup and alters variable valve timing as the revs increase, a collaboration that also provides the dashboard with correct RPM values. Over the years Volkswagen has depended upon two convenient packages, either a stand-alone Camshaft Position Sensor or an integrated timing plan in which the sensor is functionally matched with the crank unit, the distinction being whether each component is operated independently or in cooperation with another in a common package. Regardless of what configuration exists, a damaged sensor may cause misfiring, poor acceleration or even the inability to start the engine altogether; thus, keeping the Jetta well maintained is a good way to ensure reliable Volkswagen service and performance as well as economy.
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