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MartynS

Mot - Weird Emissions Results?

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My car passed its first MOT today and looking at the emissions results the CO level for both idle and fast idle engine speeds is -0.01%. How can it be negative, is my car actually cleaning the environment?! The other thing is the lambda level; 1.02 and the allowed range is 0.97-1.03. Does this mean anything as it's near the limit? And lastly, I'm guessing 18ppm on the HC level is good as the allowed range is 0-200?

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They're all good.

CO negative has more to do with machine that tested it, it is nothing to worry about.

HC measures unburnt fuel, so closer to zero the better, 18ppm is very good

Lambda is good as long as its within range, being a very narrow band, near the limits is fine either way.

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