Question about 2000 Audi A4

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Low presure oil light

Ok on idle comes as revs increase

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I had a low oil pressure alarm on my 1.8T 2003 model. It was caused by carbonized oil in the sump that was causing a blockage. The mechanics dropped the sump and cleaned out the gauze. They said it appeared that poor quality oil had been used on a previous servicing.

Posted on Apr 02, 2009

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Have you made sure the oil level is OK? If it is, you may have a faulty sending unit or you may have oil sludge blocking the pickup for the sender.

If the level is OK, get a can of Seafoam (parts store, Walmart), and pour half the can into the oil. Drive 50-60 miles, then come home, add the other half of the can, let it idle for 10 minutes or so, and then change the oil. Seafoam is really good at breaking down sludge, and if that's the cause of your problem, it should fix it. Make sure you change the oil filter too.

Try that out and see if it helps. If not, you may want to look at a new pressure sending unit - if it's flaky it won't matter how much oil you have in the car - it'll still give false readings.

Posted on Oct 26, 2008

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