Which is what i was in the middle of doing yesterday,was finishing the job,when a sudden downpour occured,quickly finished up,but before i got into the car to check the new bulb was working,i noticed what i thought was a very faint burning smell...unable to pinpoint if it was even from the car i started it up to find the "SERVICE" Light was now illuminated along with the TOXIC fumes light 
.Car is still running fine no misfiring,starts ok(although has been a little hesitant on these colder mornings)doing a search on this problem seems to point to problems with petrol models ignition/coils...anyone indicators what problems i might be looking at?Have ordered a OBD2 scanner of ebay to help with fault codes....cheers TEL.