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MOT emmisions and lambda


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Does everyone have a perfect 1 lambda reading on their MOT emission history for the IS250? Mine passed with 0.000 CO and 0ppm Hydrocarbons but lambda is 1.013. The lambda is up from last year which was 1.012 last year but CO and HC have gone all the way down. Using cataclean recently. I've got new AFR sensors, new downstream O2 sensors too. So what else could be effecting the perfect 1 lambda reading?

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in the first place, that's nothing to worry about.

High lambda readings can be caused by an exhaust blow but the it would probably be higher than what you report. More likely that its' caused by air leaking in from the 'other' exhaust outlet. If you (or the tester) were to bung up the unused exhaust outlet and seal up the one with the probe (with a rag or similar) it would probably be back to pretty much zero.

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