Hi Pirate,
My advise would be to go and get the engine ECU plugged in and check fault codes. If nothing is an issue the light can be put out - job done.
As for the cats, if you take these off it will probably fail future MOT's as I believe that from a certain date they have to be in place to achieve the correct emissions. Also there is the issue of lambda sensors (2 per side)- removal will almost certainly mean re-mapping the engine management.
Air con - yes it does work on MK1's & any local air con service center should be able to sort it out, without you having to drive half way across the UK.
I'm having a new exhaust fitted to my MK1 and the cats are staying put as they will cut just below the second cat and weld on the new free flow silencers.
Service work - well it's up to you, but I do all my service work as it's not that difficult - contact me if you require more info. rob.brooks@blueyonder.co.uk or call me on 0117 9571869
Good Luck
Robo
Last edited by Robo; 03/08/12 12:29 PM.