SOURCE: I have a BMW Z4 2003 2.5 with the exhaust emission
The Exhaust Emission Light can come on if the car is driven slowly over short distances.It will not happen on cars driven at speed. A short trip of ten miles at over 3000 revs should reset the warning light,although it may not go out for a couple of days after you have tried it . Hope this helps and saves a bill at the local dealer. JK
SOURCE: BMW wont start - Exhaust emission values have deteriorated light
HAVE IT TESTED FOR TROUBLE CODES THAT IS THE KEY TO FIND THE PROBLEM.
Testimonial: "Sound advice, many thanks"
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