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OBD-II scanner or software S90-V90

uid 11021's pic
posted by  dewfpo on  Sat Jan 20 06:01 CST 2007
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last visit: Thu Oct 23 18:34 CST 2014
[RELATED]

This is the info for generic OBDII code P0422

P0422 Main Catalyst Efficiency Below Threshold (Bank 1)

Sounds like a malfunctioning rear O2 sensor or a bad catalytic convertor.

If you have a infrared thermometer gun, check the temp at the front of the cat and at the rear of the cat after a drive, there should be a minmal difference of about 100F if it's working. If you do have that, then the rear 02 sensor or wiring may be defective. If you have no change in temp from the front to the rear of the cat, you could have a bad cat.

DEWFPO
--
1998 S90 077,400 and 1995 964 154,100






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