Post Chip Check Engine Light

[Tom Mullane]

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?
Thanks.

Tom