Question about 2003 Audi A4 Cabriolet

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Yellow warning engine light is blinking on A4 Audi 2003. Engine is vibrating. What could it be ?

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I have the same problem. What is happening is called a missfire. Your coil(s) is bad and you will need to replace one(all) of them. Take it to checker, kragen, NAPA or any other auto parts store and borrow the code reader (scanner) they have. The connection is under the dash on the left side right next to the hood release. Plug in the tool, turn the key to the on position. That is the last notch when you turn the key BEFORE you start it Then follow the on screen instructions on the scan tool.

Good Luck

Posted on Feb 18, 2009

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ONE OF THE COILS FAULTY,COMMON PROBELM.

Posted on Feb 18, 2009

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It could well be an ignition coil (assuming that it is a petrol engine) I have just had to change all mine. Audi charged £240 for changing all 4 - I had to go to them as the failed one had broken in the shaft - otherwise I would have done it myself.

First step - if you are not sure whether it is a coil get a code reader (they are about £40 online for a simple one with a manual) read the code and look up what it is in the manual.

If it is a coil then it is really easy to change. And there are good guides on the web - even if it does take a while to find them.

The instructions below are based on my A4 1.8T Petrol.

In simple terms open the bonet, remove the plastic cover from the engine (three pop up qtr turn screws on my A4 Cabrio), you will see 4 rectangular plugs, one going to each cylinder. Disconnect the faulty one (carefully so you don't break the connector) and then pull up the coil.

A quick search of audi ignition coil will give you sites with pictures of what it should look like - and lots of offers on selling you one - it is a common problem.

If all the coil comes up in one piece then either pick one up from your Audi dealer or get one from an independent.

If only half the coil comes out (the other half stays stuck to the spark plug) then you will probably have to get the dealer involved -my guess is they have a tool for that situation.

Audi dealer told me that there is an Audi bulletin saying that when one goes all 4 should be changed for the modified coils that said Audi roadside assistance fitted the old one (waranty), as did a dealer 3 months ago (which also failed today - a complaint is on its way since either Audi, Dealer 1 or Dealer 2 has either not done what they shouldor has lied)

HTH

Phil

Posted on Feb 02, 2009

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I would take it to a auto parts store that does free trouble codes diagnostic and they will tell you what it is from the codes that your car will read out this is the most accurate way.

Posted on Jan 23, 2009

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