Failed Mot Need Help

[delboy21]

Celica failed its mot today on emissions

Fast Idle Test

CO=0.57 Fail

HC=00017 Pass

Lambda=0.99Pass

Second Fast Idle Test

CO=2.16 Fail

HC=00028 Pass

Lambda=0.94

Normal Idle Test

CO=0.50

its either my cat or my lambda sensers. Can anyone tell from these readings which it could be? As lambda sensors aint cheap and a new cat for my car is uber expensive.

[GT4 BOOSTER]

try using Cataclean - a lambda is either good or bad , there's no inbetween.

http://cgi.ebay.co.uk/CATACLEAN-500ml-GOOD...A1%7C240%3A1318

[delboy21]

try using Cataclean - a lambda is either good or bad , there's no inbetween.

http://cgi.ebay.co.uk/CATACLEAN-500ml-GOOD...A1%7C240%3A1318

do these readings point to the lambda being ok then

[martin_longbow]

I would try the lambda first, how much is one?

[GT4 BOOSTER]

lambda limits are some thing like 0.90 to 1.05 for the mot test . yours passed on both idle tests , hydro carbons are really low also ,so its not unburnt fuel causing the problem. as the cat filters co2 and the car failed on co2 's - but do please buy a new lambda and let us know of the outcome.

[delboy21]

lambda limits are some thing like 0.90 to 1.05 for the mot test . yours passed on both idle tests , hydro carbons are really low also ,so its not unburnt fuel causing the problem. as the cat filters co2 and the car failed on co2 's - but do please buy a new lambda and let us know of the outcome.

you think its defo the cat then ,you think i should just buy the cat as its far more likely in your experiance

[GTForbes]

what sort of service history has the car had? i'd be very surprised if a car less than 10 years old has a failing CAT.

[delboy21]

lambda limits are some thing like 0.90 to 1.05 for the mot test . yours passed on both idle tests , hydro carbons are really low also ,so its not unburnt fuel causing the problem. as the cat filters co2 and the car failed on co2 's - but do please buy a new lambda and let us know of the outcome.

was th cat