MOT failed on emissions

Car failed MOT on CO emissions today, CO 0.68% HC 145ppm, O2 1.11%, LAMBDA 1.03. They are trying a new lambda sensor, when I got home I noticed the oil temp reads 20 C, surely this is far too low? Could this be the reason for high CO reading?

Asked on 20 October 2011 by zippyone

Answered by Alan Ross

Well yes you are correct in that the oil temp should be 70.C
As for the other readings
Your Lambda reading should be 0.97- 1.03(at increased idle speed)
Your CO reading should be 0.5 (at idle speed) HC at 100PPM
Your O2 level should be at 0.1 to 0.5 at idle speed.
Would suggest that you ask the garage to re test ( at no extra cost) at the correct oil temp.

Tags: mot technical issues co2 emissions

Similar questions

MOT failed on emissions

My Peugeot 306 Meridian just failed its MOT based on its high emissions despite having a new catalytic converter and lambda sensor. Any ideas what it could be? I really dont want to pay even more money...

MOT emissions failure - how do I fix it?

My 2001 Polo just failed MOT on emissions, high on everything. The mechanic advised I should replace the manifold cat, the standard cat and the lambda sensors. Quote for parts alone is over £700. I'd like...

Buying an old car

Hello. I am thinking of buying a Mercedes saloon between 10-20 years old. Pardon my ignorance but I dont know much about CO2. Is the car bound to fail MoT if it does not have a catlytic converter fitted?...