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VAG-COM: P0421 need ideas on troubleshooting - AudiWorld Forums
P0016 Audi A4 2.0t
P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In
Check Engine Light on with Code P0421, How Do I Fix It?
P0471 code on 1.6TDI | Audi-Sport.net
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