Emissions failure with Xsara VTS - where to start?

[francebiker]

Hi all, took my Xsara VTS in for a "controle technique" in France (equivalent of an MOT) and it failed on emissions.

The reading is as follows:

C0 1.12
Acc 3.08 (think this was ok?)
Lambda 0.910

I think the fail was for the Lambda and the C0 readings.

Where do I start to try and fix this for the re-test?

I think the Cat is OK as it is fairly recent and a genuine citroen cat. Had it on about 3 years/ 15k miles and no signs of it blowing.

Thanks.
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[francebiker]

Hi Carl, would a faulty lambda affect all the readings? thanks.