My '93 965 has been running a little rich for months. I have replaced the
O2 sensor (out of spec), the AMM (out of spec), fixed a leaking vacuum line
and swapped out the coil packs with my S90. The only fault code remaining
is 2-3-1, indicating the fuel mixture is too rich or too lean. What tests
should I perform before guessing the catalytic converter has been damaged by
overheating due to the rich mixture? Thanks.
