Why would indicator light#13 come on my dash and stay on causing a rough idle. on 2003 Volkswagen Passat

It occurred today causing the car to shut down when it comes to complete stop. And when you start the car up the idle goes up and down nonstop

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1 answer
you would have to scan the computor for codes we can do that for you for free.my number is 631-422-4010 stacks auto thank you tom