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John Vollenweider
Joined: 02 Mar 2006 Posts: 52
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Posted: Mon Jun 16, 2008 11:18 am Post subject: PO420 / B1 code |
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I cleared PO420 code , What O2 sensor / or sensors should I replace if any.
Any help would be appreciated.
I have 97 528i.
Thanks John |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Mon Jun 16, 2008 6:18 pm Post subject: |
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This code denotes "Catalyst Efficiency Below Threshold, Bank 1". Either the cyl 1-3 post-cat O2 sensor is bad, or the cat is bad.
Cheaper to replace the sensor to see if the problem goes away.
You should get the Bentley's service manual.
You should mention the mileage in your post: cats are normally replaced at 100k intervals. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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