Petrol Diagnostics: Re: BMW 523i, E39 - Code 203 bank 2 O2 sensor and lumpy idle

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Re: BMW 523i, E39 - Code 203 bank 2 O2 sensor and lumpy idle

Posted by andyhyoung

on March 2, 2009, 12:14 pm, in reply to "BMW 523i, E39 - Code 203 bank 2 O2 sensor and lumpy idle"

Andrew Young

Lambda sensor dtcs on these are usually caused by air leaks.If the inlet manifold has been off ,then I would assume that the breather pipe between cyls #1 and #6 is ok.Another common fault is the crankcase breather/oil seperator valve (sits under inlet manifold).Looks like ice-cream cone.Also is the oil filler cap a tight fit?

BMW 523i E39 1996 - Fault code 203 bank 2 O2 sensor and lumpy idle # - Ian Staples March 1, 2009, 7:12 pm

Re: BMW 523i, E39 - Code 203 bank 2 O2 sensor and lumpy idle - andyhyoung March 2, 2009, 12:14 pm

Re: BMW 523i, E39 - Code 203 bank 2 O2 sensor and lumpy idle - Ian Staples March 9, 2009, 11:59 pm

Re: BMW 523i E39 1996 - Fault code 203 bank 2 O2 sensor and lumpy idle # - Peter Wright March 10, 2009, 10:34 am
- Re: BMW 523i E39 1996 - Fault code 203 bank 2 O2 sensor and lumpy idle # - Ian Staples March 13, 2009, 10:47 pm
  - Re: BMW 523i E39 1996 - Fault code 203 bank 2 O2 sensor and lumpy idle # - Gwyn Williams March 14, 2009, 11:15 am
    - Re: BMW 523i E39 1996 - Fault code 203 bank 2 O2 sensor and lumpy idle # - Gwyn Williams March 14, 2009, 11:34 am

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