Engine Light Is On: 2008-2017 Audi A5 Quattro - What to Do ... (Randall Arnold)
The specific error or failing part could be one of many Wait a second and keep your eye on the check engine light. Vibration or shaking may be caused by misfires, poor fuel pressure, or faulty spark plugs. There is no way to know what the problem is until you plug a scan tool into the vehicle's diagnostic connector and read out the code.
Okay now check engine light came back on.
The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there?
The specific error or failing part could be one of many Wait a second and keep your eye on the check engine light. Is the check engine light on in your Porsche or Audi? The check engine light is an irritation for many drivers, but it gives you essential information about your car and shouldn't be ignored.
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