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94 944 failed emissions, high nox--ideas on readings? regina system 900 1994

posted by  someone claiming to be The Iron Chef on  Fri Aug 7 08:13 CST 2009 [RELATED]

My '94 944 Regina car also had High N0x readings like yours. The catalytic convertor needed replacing. that solved the NOx problem. However, the old CAT died from carbon build-up from a long standing rich condition. That problem was mostly solved by replacing the 02 sensor, the water temp "sensor" and water temp "sender" (2 different things). There is still an issue with the sensor that I need to fix. Still running a little rich. You will be surprised on how far the NOx fall when a new CAT is installed.

HTH

-Keith






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