Post Chip Check Engine Light

Tom Mullane tmullane at
Fri Jun 14 23:28:01 EDT 2002

Hello All,

I just installed my newly IA chipped ECU and took my car for a spin; the
car runs great and there is definitely a power improvement.  I got about
2 miles before the Check Engine light came on.  VAG-COM reports an
oxygen sensor problem.  I cleared the faults, but the light was back
within a few miles.  The OXS is of unknown age and condition, but the
light has not been on before.  Is the new chip and resulting changes to
the turbo and air/fuel programs too much for an older OXS?  Comments?


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