what could this be????
#4
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You need to get a wideband done to check your air fuel ratio. But it sounds like the codes were a lean condition detected by the PCM based a number of conditions. The codes were probably P0171 and P0174.
Check here: Gearchatter
Check here: Gearchatter
#5
and how would it detect cylinder 1 lean in bank 2 when cylinder 1 is on the opposite side?