Hi,

new, hoping someone can help. I took my Brava P plate for it's MOT and it failedonthe CO only, but the readings where high. could anyone give advice as too what i should do to reduce them. the readings where

fast idle - CO 2.71% , HC 105ppm, Lambda 0.98
sec fastidle - CO 1.59% , HC 64ppm , Lambda 1.00
Natural Idle - CO 1.26%

Hope this helps and thanks for any replies

I've had a look about and high CO seems to suggest the CAT needs replacing.

Sorry

Yes High CO is lambda sensor or cat.
Lambda is cheap and easy to change. You takes your choice

To bump it through this year you could try the old red-ex and thrash technique? Might be enough to get it through this year and gives you time to get the parts changed in prep for next year.

Deckchair5 said:

Yes High CO is lambda sensor or cat.
Lambda is cheap and easy to change. You takes your choice

Click to expand...

I'd go with trying that first, it happened to me last year and after a change and driving for a few days, all was good and passed fine. Cats are costly and despite the damage I've done to mine (due to lots of exhaust problems), it still works fine so hopefully not that.

Had the same problem but the guy at the garage managed to get it through by testing it again after the car was hot. Had the CAT changed anyway and was much better but now have problem with the new CAT as its very noisy.

noisey as in rattling (in whihch case rip the heat shield off)
or noisey as in blowing / leaking (in which case slap whoever fitted it and get them to use exhaust paste this time)


and you are right, before every mot you should get the car nice and hot, give it a good long hard drive. also add a bottle of an emissions reducing additive, they actually work