This is my first post here
I passed my driving test 18months ago, after 10 attempts 
and 24 years of learning I bought my first car in feb 08, an escort. My C3 I bought secondhand in May 09 (its 03). Exactly a month after I got it the engine warning light came on, I took the car straight to Citroen garage who told me the car needed a catalytic converter. The car had 3 month warranty so I went back to the seller who told me only parts inside the engine were covered 
Anyway I decided to get an independant to do the job, which he did, two weeks later the warning light was on again. Took it back, he took exhaust of and checked it, changed the sensor and said it would be ok. Few weeks later light on again
He then decided cat must of been faulty so changed it. Again light has come on I am at this moment without my car, as I decided to take it to the Citroen garage to get all the other jobs done (cambelt, alternator, brake pads/discs...and know a phone call to say radiator is leaking too
)My reason for this post, is I wondered if anyone else has suffered with their warning light keep coming on, and how I can actually resolve this
...whoever had the car before me decided to tape up the hose...the mechanic showed me the one he had taken off