MOT Lambda Values

[alcal]

Just had a close shave at the test centre with my Sigma 140. It failed on the first attempt but passed second go when the tester held the revs. at exactly 2500. The tester speculated that Caterham may have mapped it to do this - does anyone know if this is the case ?

There is a slight leak/blow at the cat/silencer joint. Could this affect the test?

Thanks

[Ian Mackenzie]

Yes a leak will affect this as fresh air will be pulled in and effect the reading, a hot Cat is also needed, cold and it will probably fail.

cheers

Ian