Question about 1999 Audi A4

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Engine fault light

I have an Audi a4 2001, just had the engine fault light come on.Before this the oil light came on but I topped up the oil had the car serviced oil changed @83400.Now its Engine fault light that has come on @ 83499 on checking the oil I noticed a creamy substance on the oil cap but I have read that this could be condensation???I have booked the car for dealer diagnostic I hope its not the driver's worst nightmare head gasket.Any idea roughly the cost of replacing this from dealer.Iam keeping my options open with the worst in my mind.No oil observed in coolant and the coolant levels are fine.

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There's a good web site for getting estimates on auto problems. In my area, a head gasket on your car is estimated at around $1500 at a dealer, $200-300 less at an independent garage. The site will also show a list of independent garages in your area.

Posted on Feb 05, 2009

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1. A fault with the actual oil pressure.
2. An electrical fault with the switching circuit.

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

Such as the oil filter collapsed or the oil pressure release spring could be jammed open/closed which would cause the engine to not have the correct operating pressure.

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