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P0421 Diagnostic Trouble Code Discussion for October 2012

Warmup Catalyst Efficiency Low (Bank 1)


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Trouble Ticket Help Requests for DTC P0421
Help Request Posted
2001 Volkswagen Passat GLX 2.8L Surge, Cuts out VIN: WVWBH63B01
... turning right while accelerating. Never straight or left. We do not currently possess a VW factory scan tool. The exhaust repair will most likely solve the P0421,P0431, and P1176 codes (unless cat is damaged), our question is mainl...
October 29, 2012