NCT corsa 99 1.0 failed high idle 0.50% (limit 0.30%)

voytas

High idle CO 0.50% (limit above 0.30%) FAIL

Is anybody know how to reduce high emissions of my corsa 1.0 1999? NCT failed just this morning...

George Dalton

Put up all the emissions figures from the sheet. Low idle and high idle. Exactly as they appear on the sheet. Then someone may be able to suggest a cause.

voytas

Engine/oil temp 104 C
Low idle CO 0.11% (limit 0.5%) PASS
1,060 rpm HC 89 ppm (limit 0 ppm) N/A

Lambda 1.00 (limit 0.97-1.03) PASS
High idle CO 0.50% (limit 0.30%) FAIL
2,750 rpm HC 57 ppm (limit 200ppm) PASS

George Dalton

From looking at that I would say you most likely have a cat problem. It is impossible to do a 100% diagnosis over the internet though

voytas

I'm trying to get used one, would it help? But i know used one might not help me. I have to go to make a diagnosis anyway then will see whats wrong. Thanks anyway!!!

George Dalton

A good used one would help. The problem is that you won't know whether it is any good or not until you fit it and have another emissions test done.

voytas

exactly but i found one 50 quit so this is the cheapest way to do it

Nissan doctor

The usual 3 cylinder cracked manifold could be a possible cause too..

mecanoman

Possible O2 sensor at fault too. Happened on my Clio, last year.

Diagnositic scan by a friend, showed the O2 sensor, bought one off ebay

€60, half an hour under the car(awkward enough, but got there :pac:).

Did the retest, flew thru and running fine.