Question about 2001 Audi A4

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Banging noise coming from engine

I have a 2001 Audi A4, my oil light came on and i had to drive about 20 miles to nearest store where i put some more oil in but the engine contineus to make a banging noise and black smoke comes out of the tail pipe a few times, lightly.

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There are 3 possible reasons the oil light would go on. The 1st and 2nd reason would be due to no oil lubrication of engine components. This could be from a failed oil pump, or critically low oil level. The 3rd possibility would be a defective oil sending unit giving a false reading of a problem. You should always immediately pull over and shut the vehicle off if the oil light goes on, as driving the vehicle could result in severe damage to the engine. The banging noise you hear and the black smoke is probably due to a major engine problem, due to lack of engine lubrication. How much oil did you have to add to bring it up to full level?

Posted on Apr 20, 2009

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Sound like rod and main bearings failure.

Posted on Apr 20, 2009

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If you are confident the problem is not with the oil pressure, disconnect the wiring from the switch for a period of time. If the light still comes on periodically the fault must be with the wiring circuit shorting to earth. There will be no fire hazard to this approach as the voltage will drop over dash lamp.

However if the problem is with the oil supply system, the danger with this approach is you are potentially unaware of a serious problem

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