Re: Fiat Stilo, 51 reg, 1600 16v failed MOT emissions on CO Archived Message
Posted by Graham Bullock on December 10, 2007, 11:22 pm, in reply to "Re: Fiat Stilo, 51 reg, 1600 16v failed MOT emissions on CO"
Hi Martin, you said "Rear 02 sensor working ok at around 0.4 to 0.7v." If the cat was not there at all then the rear sensor would switch just the same as the front sensor, a good cat would have an almost constant voltage (maybe around 0.6 v) from the rear sensor, is yours switching between 0.4 to 0.7? If it is then the cat is not efficient. Graham
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