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HELP!!! I have just replaced my cat converter with a part I bought from German and Swedish which I was advised would do the job. After this was fitted I noticed an improvement in the performance of the vehicle and the distinct rattle noise disappeared.
After approximately 20 miles my Engine light appeared and I appreciate this confirms an emmission problem. I have taken the vehicle to a BMW specialist who ran a diagnostic test on the vehicle using laptop etc. They said that their was no code and that the brain was not advising them of the problem diagnosis.
How do I get rid of this light? is it because I did not use an original BMW part when I replaced the cat converter? All replies would be thoroughly appreciated.

Cheers Pete

UK
 
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