NCT CO Emissions Fail

[Randy]

Mine failed on Saturday as well.. Pretty much the same results as before replacing the cat.
Going to have a look at the AFR, and maybe weld on a second cat (Out of other ideas at this stage).

[Johnny]

Sorry to here that, let us know if you get it sorted.

[MX5Spares]

The 914 I am rebuilding passed with good used cat fitted .Reading were 1.1 and limit is 3.3 so well under.and cert til July 2016.!!

[Randy]

Tried again, but still no success.
They were down a good bit after adjusting the AFR, but the lambda was way out..
Going to try one more time, and go mental on the AFR to see if it can pass.

[Johnny]

The lambda reading relates to oxygen I think, so maybe a vacuum/air leak in the intake after the AFM or in the exhaust or oxygen/lambda sensor needs replacing.