My car did not pass emmision inspection
SOURCE: 1996 328i bmw sometimes loses power and won't pass smog test
Ok you will have to have it scanned. It probably has cylinder misfire codes and random cylnder misfires. You could need spark plugs and or coils. The scan will tell you exactly which cylinder is missing. That will cure your problem and remember to change your oil and filter right before you go in for the smog test. Also if the car hasn't been serviced in a while it would be a good idea to replace the air filter and fuel filter.
SOURCE: inside tire ware [rear tires] on 98 bmw 540
either you have alot of weight in the trunk all the time or your rear struts are blown
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