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Car ('95 M5) just failed the MOT on exhaust emissions. I don't have the figures in front of me but the CO2 was about 6% instead of .5 and the hydrocarbons were double with the lamda miles out too. Stuck it on a BMW test machine and it came up with an open circuit Lamda, and also the air flow meter was showing it had had 4 faults, but none current. Changed the Lamda and re-tested it and it made no difference, figures still terrible. Changed the Air flow meter which has ALSO made no difference....
The car drives fine and the fuel consumption has not changed....what the hell's wrong? Would the cats have failed and could it be causing the figures this high? What test can I do to narrow this down as according to the BMW box of tricks the car should now be fine.... I'm running out of things to check here, anyone got any ideas please?
The car drives fine and the fuel consumption has not changed....what the hell's wrong? Would the cats have failed and could it be causing the figures this high? What test can I do to narrow this down as according to the BMW box of tricks the car should now be fine.... I'm running out of things to check here, anyone got any ideas please?