BMW 740 IL Troble Codes & Repair

1998 BMW 740
100,000 MILES • V8 • 2WD • AUTOMATIC
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MR.M
  • MEMBER
  • 1 POST
PO302 = Cylinder 2 Misfire Detected. ? PO430 = Catalyst System Efficiency Below Threshold (bank 2). ? PO420 = Catalyst System Efficiency Below Threshold (bank 1). ? PO133 = 02 Sensor Circuit Slow Response (bank 1 Sensor 1).? Any idear where to start to repair these trouble codes? Car not running that good at this time misfiring and chuging.
Aug 14, 2011 at 10:20 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Where to start is a good question. I would see if the compression is even in all cylinders first.
Aug 21, 2011 at 6:19 PM
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DR LOOT
  • ✓Experienced Mechanic
  • 2,311 POSTS
those particular code all lead to a vacuum leak
Dec 19, 2011 at 8:33 PM
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