failed catalystic converter

2003 BMW 325I
76,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ERAHME
  • MEMBER
  • 1 POST
HOW I KNOW IF THE CATALYST CONVERTER IN MY BMW 325I 2003 IS BAD?
May 28, 2011 at 2:02 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Get a 5gas analysis test this will tell if its scrubbing the gases or not-
May 28, 2011 at 2:30 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Also, your car's PCM monitors this for you. It will set a code PO420 or PO430 for the other side.
May 28, 2011 at 4:46 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
And report back here straightaway with the readout numbers from the 5 gas analysis.
Jul 5, 2011 at 2:38 PM
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