Engine management warning light keeps coming on.

[mikeyb]

The engine management warning light intermittently comes on for days at a time. The car appears to be running fine. On it's first visit to the local garage the fault code indicated that one of the cat sensors was faulty, this was replaced. All ran fine for 2 weeks then the light came back on, the garage now recon that the code indicates a faulty cat, this was replaced less that a year ago.
Any comments or advice would be appreciated, I've used this garage for years and accept what they say but I would like to know and understand whats going on. Cheers for any help :y:

[Jagztorious]

could be anything tbh, go to a garage and get a diagnostic check done, Also check that your cat is connected!

[mikeyb]

Garage did run diags, seems funny that one day they say cat sensor and 2 weeks later say it's the cat.

[craigy_87]

might be a good idea to take it to citroen for a diagnostic on their machines