CO2 emissions

[baz1701]

I have a 1.4LX 2000 and it is struggling to get through the CO2 MOT emissions test.

I have replace all the throttle body sensors, lamda sensor, replaced the CAT and fitted a new head.

I barely got through this year and other than this 0.2% over the limit the car is in good condition for the year (all new front and rear suspension).

An RAC man told me that if the car runs cool it could produce higher CO2, mine generally runs around 70 to 80 DegC where are my wife's 2001 Meridian runs close to 90. Any ideas as I want to try and sort this out before the next MOT in Feb.

[powerandtorque]

What figures did you get for the CO, HC and lambda readings on the emissions test?

[baz1701]

What figures did you get for the CO, HC and lambda readings on the emissions test?

Don't have the exact figures to hand but the HC and Lambda where fine in the middle and the CO2 was a 0.02 over for the first test and 0.39 after I changed the CAT. The new CAT was a type on not a standard one.

[John1.4]

i would say that's because it wasn't up to temp, a lot of the aftermarket ones have to be almost red-hot to do anything, coolant temps being lower may affect it, these TU lumps do run at about 90-95 degrees normally, do you run coolant or have you just got water in there?

ideally go for a good italian tune-up just before the Mot and get it put on the emissions tester straight away