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Message: <blockquote data-quote="jarance" data-source="post: 389387" data-attributes="member: 21">In some cars, there are two sensors. One is the crankshaft sensor and the other is the knock sensor sensor.Crankshaft sensor or some people call it timing sensor sense the TDC of the crankshaft. This will enable the ecu to precisely fired the spark plugs. If this sensor fail, then the ignition and fuel system is disable. This is a fail-safe feature of the Ignition system.The knock sensor prevent the engine from knocking due to low content of lead in the petrol. There are also other sensors like the Oxygen O2 Sensors which help to optimise the firing of the fuel. Some cars have 2 sensor and some car have 1 sensor.</blockquote>