maslin4863 Posted March 14, 2009 Share Posted March 14, 2009 Forgive me if this is in the wrong forum, apologies if it is. I put my V reg mondeo ghia X auto which has done 79k in for a mock MOT yesterday (I am a little paranoid about my car as my last one died on me doing over a ton on the autobahn in germany and don't understand how they work) and was told it had failed the fast idle emissions on CO levels which were at 0.537% and the second at 0.632% which are both over the 0.300% the lamda results were increased at the second result but it passed the lamda test.I spoke to a Ford garge who said they would diagnose it at an extortionate cost and said becaus of the lamda results my CC is probably gone and I would need a replacement at some £600+! I was adviced from the garage that did the test that if I replaced my air filter (which was replaced on my last service at 74K) my emissions might be lowered enough to pass. I did this but got the wrong one and took it to a seperate garage who cleaned my air filter and tested my fast idle again and the CO result was 0.000% but my lamda result had increased again which was a rise from before?! Does this mean my CC is going or I have a dodgy sensor somewhere which might be playing up as a drop from 0.632 to 0.00 seems steep for just a bit of dirt in a filter and the garage just told me it happens sometimes which has me confused, could I need a new cat?! Quote Link to comment Share on other sites More sharing options...
SierraYankee99 Posted March 15, 2009 Share Posted March 15, 2009 It could mean you need a new Cat but it could also be a faulty lamda (oxygen) sensor near the cat thats giving the ECU a bad oxygen reading so its adjusting the settings to try and get the emissions safe. The only real way of telling is getting a diagnostic done. Quote Link to comment Share on other sites More sharing options...
RIIIDAA Posted March 18, 2009 Share Posted March 18, 2009 Engine being cold would give higher co2 readings than when it's all warmed up... Quote Link to comment Share on other sites More sharing options...
danny2252 Posted April 1, 2009 Share Posted April 1, 2009 i had a car in at my old garage with same prob and i put some cat clean in it and gave it a good run to get it nice and hot and it went straight thru the test give it a try its worth it only 8 quid for a bottle i think:) Quote Link to comment Share on other sites More sharing options...
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