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Why does my Audi A2 have a rough idle when the engine is cold?

I've noticed that my Audi A2 has a rough idle when the engine is cold, but it smooths out once the car warms up. What could be causing this issue and is there a solution?

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Answers (3)

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This could be due to a dirty or faulty idle air control valve. It regulates the engine's idle speed and can become clogged with carbon buildup over time. I recommend getting it cleaned or replaced by a mechanic for smooth idle.

Another possible cause is a malfunctioning oxygen sensor. This sensor measures the amount of oxygen in the exhaust and helps the engine adjust its fuel mixture. If it's not working correctly, it can cause rough idle and decreased fuel efficiency. Have it checked and replaced if necessary.

J

Check your spark plugs and wires as well. If they are worn or dirty, it can cause engine misfires and rough idle. Replace them if needed and also consider a fuel system cleaning to improve engine performance.

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