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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Re: Engine fault light
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.
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sensor fail is common fault. can be a build up of dirty oil blocking the sensor. should of just kept the the old type that just tells the ecu there is oil. you may be lucky and it could be the sensor plug at fault check that first.
What kind of oil? Is its not synthetic it's wrong...the Audi engines have a small oil pickup tube and the cheap oil gunks up the engine and clogs pump screen causing light to come on eventually engine failure....you need to flush engine ....you can use kerosine or go to parts store and tell them you want to clean the internals of gunk ...pour in engine oil let run for few min drain oil ...buy cheap oil for this do same thing 3 times ...when light goes off your done fill with fully synthetic oil and you just saved your engine ...only synthetic oil
This could be a low oil pressure problem or a failing oil pressure sending unit (sensor). It could even be diluted engine oil. If it has been a while since the engine oil was changed, then change the oil and filter. If you still have the problem, then perform an oil pressure test and measure the actual oil pressure. It should not drop lower than 7 PSI at idle with a warm engine. If it does, then there is an internal problem with the engine like failing oil pump or worn bearings. If the oil pressure tests ok, then have the oil pressure sending unit replaced.
Audi cars do not use much oil as far as I know.A new engine which is not warned together can take some oil of course.Make sure that you use the proper oil type specified by the manufacturer.Try to change the oil and filter completely,then measure the oil consumption.Should not be more then 1 liter on 10000kms.
Well, if the low-oil-pressure warning light is on, and the engine is knocking, and there is plenty oil in the crankcase, then the oil pump must not be circulating oil thru the engine. So, I agree -- I think your oil pump is bad.
There are potentially two different problems here. 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.