Fiat Stilo, 51 reg, 1600 16v failed MOT emissions on COArchived Message
Posted by Martin Kelly on December 10, 2007, 10:27 pm
Hi, above car has engine code 182B6000. MOT emissions results at fast idle: CO 0.4 Failed HC 0.0 Lambda 0.997 O2 0.15
At normal idle, as above but CO was 0.2 and passed.
Only code was P0430 low fuel level sensor. Front O2 sensor had good response at normal idle but at fast idle it slowed down quite a bit and was renewed. This made no difference to the gas readings. Rear 02 sensor working ok at around 0.4 to 0.7v. CTS working ok, scoped coils all ok, throttle housing cleaned out. New plugs fitted. Forte Gas Treatment added and given 'strenuous' road test and still have 0.4 to 0.5 CO at fast idle. It looks like the cat is working okay and the car drives fine.
Have I missed something blindingly obvious, any pointers please?