[mlue]

kiwior, I think the cat on a 951 is setup a little different and is not as straight forward as a 944NA, hence the more complicated exhaust plumbing. I may be mistaken but isn't there some sort of air pump that supplys air to the cat to aid in the catalyst action. If this pump failed ???

Has any of the exhause pipes between the engine and the O2 sensor being remove and reinstalled ? If there are any air leaks in the system prior to the O2 sensor this could cause the sensor to read a lean condition and conpensate by richening the mixture.

I would still check the O2 sensor though, cann't hurt!


Mark
'86 944NA

PS. I know I have written alot, so I will be quiet now !!! ;~)