Can anyone tell me what the camshaft sensor does, and if it is faulty/broken what will happen to the car?
Thank you.
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It's a phase sensor, which allows the ECU to determine which of the pairs of cylinders which move together in a 4 cylinder engine (1 and 4, 2 and 3) is actually being fired, and which is on overlap.
Without it, the ignition will function no differently (it's a so-called wasted spark system), but, the injection will revert to *ganged mode, where all injectors fire together every 180 degrees of the crank, as opposed to operating in sequential mode when each injector opens while the relevan inlet valve is open.
Failure of this sensor will usually put the engine management light on, but the car will probably remain quite driveable.
* ganged mode sounds much worse than it really is - many fuel injection systems did this and much worse until the mid 90's or so.
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