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BMW 740 IL Troble Codes & Repair

Tiny
MR.M
  • MEMBER
  • 1998 BMW 740
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
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.
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Sunday, August 14th, 2011 AT 5:20 PM

2 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Where to start is a good question. I would see if the compression is even in all cylinders first.
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Monday, August 22nd, 2011 AT 1:19 AM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
Those particular code all lead to a vacuum leak
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Tuesday, December 20th, 2011 AT 4:33 AM

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