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Showing results for tags 'p0021'.
Good morning, here is my challenge with my 2004 high mileage Cayenne Turbo: on initial startup, I get a very rough idle that will settle after a minute or two, after the typical start-up cycle, although it will remain a bit rough afterward as well. I ran my codes and came back with these: P0199 - engine oil sensor (more on that in a moment) P0021 - cam position timing over advanced or system performance B2 P0431 - catalyst system efficiency below threshold bank 2 Plus misfires on 1, 3, 4 P0446 - evaporative emission vent control implausible signal