[Dragon88]

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?

[doughboy]

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.

[Dragon88]

Thanks, just saw the thread from stevew, will be on the case first thing in the morning grr!

[G82Dude]

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!

[Dragon88]

All sorted, they had to select the engine manually, rather than enter the reg.