Question about 2002 BMW 3 Series
Sounds to me that the O2 sensors are sensing a problem with the emissions, or other emision controls have detected a problem that may not necessarily cause a driveability issue.
If you have emissions inspections in your area of the country, then I would have it repaired before the next inspection.
Have the OBD-II scanner check out the computer codes and descriptions by Autozone or Advance Auto Parts for free, or buy your own scanner for under $100 from Sears or Walmart.
Good luck on the repair.
Posted on Nov 12, 2010
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Posted on Jan 02, 2017
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