Just had today fitted a cat/back system from longlife and within 2 hours the engine management light showed up and immediately thought the lambda sensor so have asked question on google and other people have had the same problem, would it be best to part with the cash for a code reader getting hooked up or is there something I can try first?
I would find someone with a code reader nearby, they could reset it and see if the light stays off...
Yeah think that's my best bet to be honest, better get it done sooner than later 'cos i'm a born worrier especially when it comes down to me motors i'll of lost half a stone by next weekend - LOL..
Just off the topic a sec mate - I see you have Citroen screen washers what exactly have you changed around 'cos I've always been on the lookout for a better screen wash than originals?
As said if youve got rid of the cat I can supply kits to turn the mil light off. But if you haven't best get a cheap code reader, I got off of eBay for sub ?20.