MOT - Carbon Monoxide level

[embee]

Yes, functioning normally for the fast idle test, but if it wasn't hot enough when the normal idle test was done it won't have been converting efficiently. If they had repeated the normal idle test when fully up to temp it might have shown a much lower figure.
We are guessing, whatever the cause. The fact that it performed fine on the fast idle says there's nothing to worry about.

[sparky Paul]

Yes, functioning normally for the fast idle test, but if it wasn't hot enough when the normal idle test was done it won't have been converting efficiently. If they had repeated the normal idle test when fully up to temp it might have shown a much lower figure.

The fast idle test is always done first, immediately followed by the natural idle test.

Both have to pass in one go, parts of the test can't be repeated individually.

[embee]

OK, thanks, I wasn't sure what the order was. I know it has be done all in one sequence.
In that case we can only guess.

[sparky Paul]

In that case we can only guess.

Indeed, I really wouldn't worry unless there's a problem at the next MOT.

[John Marshall]

A big thank you for all the replies

Keep safe

Regards

John