MartynS Posted August 31, 2013 Share Posted August 31, 2013 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? Quote Link to comment Share on other sites More sharing options...
wase16ll Posted August 31, 2013 Share Posted August 31, 2013 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. Quote Link to comment Share on other sites More sharing options...
MartynS Posted August 31, 2013 Author Share Posted August 31, 2013 Cheers for the info, knew if was ok as it passed :P but good to hear it's all normal. Quote Link to comment Share on other sites More sharing options...
robdougalriley Posted September 5, 2013 Share Posted September 5, 2013 Would it not mean it's less than 0.01%... I've got my first MOT on my car tomorrow having only passed my test in July... Just hoping my poor child will make it through unscaved! Quote Link to comment Share on other sites More sharing options...
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