At 167,000 kilometres the engine light came on in the Audi A4, and I couldn't get an appointment with the Audi dealer, so I decided to troubleshoot and fix the problem myself!
Tightened a loose bolt near the electrical harness
Decided to replace spark plugs, and also use a complete fuel system cleaner
After removing the two small screws that hold the harness, the electrical connector must be gently released from the coil without breaking the tabs
(see this post for more detailed images in the Audi A3)
Lift the ignition coils out of the cylinder head
Remove and replace the spark plugs
Dirty petrol and a fuel cap that isn't shut properly can also cause the engine light to come on
From my experience, I think Shell has cleaner petrol (gasoline) than Esso!
For more detailed images, see how I replaced spark plugs in the Audi A3
Happy driving!
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