The Audi A4 Camshaft Position Sensor provides the engine control module with exact information of the camshaft position and speed, enabling the computer to initiate the firing of the spark plugs and spray of fuel at the highly appropriate time. This little piece of electronics, which is picked up by the camshaft in most Audi engines, but which is sometimes mounted behind the cylinder head or just in front of the block, demonstrates that mounting points have changed as the body styles and engine bays have changed. The Camshaft Position Sensor, no matter where it is located, always compares the rate of rotation of the camshaft to the data received by the crank sensor to ensure that the pistons and valves remain in proper synchrony, a requirement for fast startups, smooth idling, and variable valve timing engines. The Camshaft Position Sensor supplies the ECM in thousandths of a second and enables it to fine tune the fuel injection and spark, and when it malfunctions an A4 may stumble, pause, or even not start at all. Audi thus combines this sensor and the crank sensor since the two are among the highly important gauges in any modern powerplant, with one sensor monitoring the movement of the cam and the other monitoring the overall engine speed revolutions per minute. Although the quoted material does not provide the various electronic formations, it is clear that all Camshaft Position Sensors employed by Audi are aimed at the same purpose, the correct timing data, and that the primary difference that will be observed by an owner is the place in which the part is bolted. Maintaining good health of the Camshaft Position Sensor is hence an important aspect in ensuring that an Audi retains full performance and fuel efficiency.
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