Bad times bloody car failed MOT yesterday on drop links and emissions, drop links not the problem but getting emissions down is i've left the 3'' decat down pipe on and fitted standard middle CAT and back box but emissions still really really high anyone got any ideas on how i can lower them. Thanks Andy

 

Is your lambda sensor working?

 

I had similar, but as said, make sure the lambda sensor is up to scratch, they can get tired over time.

Also, and pretty important, ensure the cats are harry red pigs. A longish drive around with some good lengthy blats should help things along.

By how much did it fail (if you know) as this might point out what is at fault.

I have a sports cat on, and it needed to be really hot for it to be of any use to the point where the MOT guy told me to give him ten minutes notice so he was ready with the machine. I had to drive around the trading estate, getting funny looks of everyone while I warmed the cat up. Pain but it passed.

 

Same on my test, new lambda and sorted

 

Looking like a new lambda then, just been looking at fail sheet and the CO was .521% over what it should be and the lambda reading should be 0.970-1.030 but it was 1.040, so more bloody expense scooby= money pit
Thanks for advice guys

 

but a 1.040 lambda is very lean.......so wouldnt you expect that to have better emissions than summat runningn richer?

..and why is there a top limit for the lambda reading...I would have thought that >0.970 would be acceptable?


...guess I dont understand lambda readings so much???

 

i was gonna fit a decat downpipe,dont think i will now with the MOT in the next 5 mths, too much hassle.

good luck

 

Find a garage that lets it thru with decat pipes on and passes em, that all i do with mine, keep an eyey on my emmission thru wide band on the lap top

 

but from the query above you aint gonna be able to tell from the wide band - even if the lambda shows >1.00 the emissions could be out from what was originally posted
...thats now got me worried for my MOT on tuesday ...idle lambda is 1.00 to 1.03, but I have no idea what the emissions will be!!!