MOT Failed on Lambda
Could anyone shed some light on my confusion. I put 147 through MOT today but bloody failed. 2 points, 1 was the exhaust was too loud! Old mans discretion I can assure you! and the second was it failed on emissions as the lamda readings were too high the first idle was 1.28 and the second fast idle was 1.43 with the limits being 1.03. Hydrocarbons were all OK. On the advisory note it said there was a minor leak of exhaust gases on the centre part of exhaust system!
My question is am i right in thinking that exhaust gasses leaking would interfere with the Lambda readings or is it likely to be the lambda sensors??
Any help would be appreciated. Luke