My 03 Audi A4 1.8T check engine light keeps coming on and computer and mechanical inspections reveal nothing. My mechanic who has taken care of the car with regular synthetic oil changes thinks the problem is oil sludge build up which is fatal . Anyone have any other ideas or is this car toast?

SOURCE: Audi 80 oil pressure light

i think from memory that the oil pressure switch is at the back of the cylinder head, if its not there it will be located just above the oil filter, these switches are very cheep to buy and can be bought from any good motor factors. You are right to suspect the switch, its the first thing to eliminate before bogging your self down with more complicated and expensive problems.

SOURCE: Check Engine Soon Light

tc52 Every time your check engine light comes on there should be a code. there is no such thing as just a light coming on. there is a reason. if you take your car to a autozone or advance auto parts they will come right out and read it right in front of you and tell you what the code is and what it means when you find this out e-mail for further assistance [email protected]

SOURCE: oil and brake light flashing

Is the ABS light on as well? If you have ABS and the light is on (like in Guest's comment) is it probably the ABS Control Module. You should have someone read the code to see if you get ABS as one of the issues. Rather than spending a fortune with the dealer or having a non dealer replacement, check out ModuleMasters.com. You take the the unit off (easy and OK to drive without it, you'll just have no
ABS - which you probably don't have now!), mail it out to them, they rebuild it for $200, send it back and you install it, problem solved. They have step by step photo instructions on their site. A mechanic I use for diagnosis and difficult repairs initially wanted to replace the instrument cluster and then talked about replacing it with a new unit. I went online, read about the issue and fixed it myself. I let him know about it and now he has done it three times the same way with great results.

SOURCE: A6 engine ''deep rattling'' noise

go to scottykilmer.com - i use this guy a lot - you just have to sign in - first name only! or whatever you want to call yourself. it is 100 percent free and he is an expert on all cars - you can expect an answer within an hour or so! this guy knows more than one person should know - trust me - no fee for free info? cant go wrong

Scott Young

• 91 Answers
• Posted on Aug 03, 2009

SOURCE: 2001 Avalon Check engine codes P0440,p0441 and p0446.

yes it would be a smart thing to do and no it is not that hard it should onlt have two bolts holding it on