annoyance of those codes and keep running it unless they are definitely degrading. maybe the CEL comes on with that code only after it has been set for a continued amount of time. when i set it for each side of the exhaust, it didn't turn the CEL on...but I do remember erasing them after i saw them.
mike
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'06 B7 A4, Black, 6spd 2.0T GT2876R/0.64a/r, Avant
'01.5 S4, Santorin, 6spd, Sedan
'01.5 S4, Silver, GT28 6spd, Sedan
'01.5 S4, Black, 6spd, Sedan
'92 G60 Corrado, 5spd with built 20V 1.8T, GT2871R/0.60/0.86, full drive by wire
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mike AT vastperformance DOT com