P0421 trouble code update
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AudiWorld Member
Joined: Apr 2001
Posts: 382
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P0421 trouble code update
I posted a few weeks back regarding this trouble code. Brought the car to the dealership to diagnose for free by the way, and they reset it, and told me if it comes back on within a week or so, it will mean its a bad cat. so a few days later the CEL came back on, called up the dealership and brought my car back in and they replaced both cats. all covered under the emissions warranty!
thank goodness, otherwise it would have been around $2000.<ul><li><a href="https://forums.audiworld.com/a4/msgs/2192697.phtml">https://forums.audiworld.com/a4/msgs/2192697.phtml</a</li></ul>
thank goodness, otherwise it would have been around $2000.<ul><li><a href="https://forums.audiworld.com/a4/msgs/2192697.phtml">https://forums.audiworld.com/a4/msgs/2192697.phtml</a</li></ul>
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