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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Failed MOT - Emissions Lambda



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      11-14-2012, 03:37 PM   #1
Dragon88
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Failed MOT - Emissions Lambda

My E92 320i failed its MOT on emissions lambda reading. The sheet shows lambda upper limit reading as 1.03, my actual was 2.20.

Now after doing a bit of research, I come across:

http://www.bmwland.co.uk/forums/view...p?f=4&t=133386

and

http://www.bimmerforums.co.uk/forum/...ssions-t74667/

Can anyone here confirm if the lambda upper limit should be 4.0 on the N43 petrol engines?
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      11-14-2012, 03:57 PM   #2
doughboy
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Yep,

similar thread here a few days ago. MOT man using the wrong engine type.

Regular 'normal' petrols run lambda 0.98 to 1.03 ish.

Yours is a lean burn engine as the forums describe, go back to the garage and tell them.
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      11-14-2012, 04:28 PM   #3
Dragon88
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Thanks, just saw the thread from stevew, will be on the case first thing in the morning grr!
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      11-14-2012, 06:25 PM   #4
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Can tell you for an N53 30i, min is 0.700; max is 4.000, so can't think the N43 is much different if at all.

Common MoT tester mistake not selecting the lean burn engine on the Sun tester!
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      11-15-2012, 01:14 PM   #5
Dragon88
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All sorted, they had to select the engine manually, rather than enter the reg.
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