P0431 Diagnostic Trouble Code Discussion for February 2018
Warmup Catalyst System Efficiency Low (Bank 2)
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| Help Request | Posted | |
| 2002 Audi A4 Quattro 3.0L Surge VIN: WAULT68E22 P0431: Bank 2 Warm-up catalyst efficiency below threshold. Greetings all, I have a 3.0L Audi with a odd issue. One the engine reaches operating temp, It begins to surge at about 1000 RPM. It starts off as a random misfire then builds to a full on surge. This will happen sometimes at a dead idle or 1000-1400 RPM(Sp... |
February 27, 2018 |
