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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-16-2013, 07:28 PM
kgorczyn kgorczyn is offline
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Is It Necessary To Replace Post-Cat O2 Sensors as Prev. Maint?

I have a 2000 528i w/ 235k miles - no codes or anything. I replaced pre-cat at 100k and 200k. Post Cat are still original.

Do they affect anything other than emissions?
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  #2  
Old 01-16-2013, 07:38 PM
edjack edjack is offline
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They only monitor cat performance. If you do not get any post-cat codes, relax.
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  #3  
Old 01-16-2013, 07:55 PM
ian@jewelorjalopy ian@jewelorjalopy is offline
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Nope, what Ed says. They are only there to measure the cat efficiency, and will tell you when they go bad. If they don't throw a code, keep them.
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Old 01-17-2013, 04:47 PM
professorman professorman is offline
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Quote:
Originally Posted by ian@jewelorjalopy View Post
Nope, what Ed says. They are only there to measure the cat efficiency, and will tell you when they go bad. If they don't throw a code, keep them.
How about the pre-cat oxygen sensor for me? I have 168k miles. Should I replace them 'just because', or wait for something?
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  #5  
Old 01-17-2013, 09:41 PM
ian@jewelorjalopy ian@jewelorjalopy is offline
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Unless you are having issues with them, or funny idle or other symptoms, just run them.

Even if they fail, the car will still run, and you can replace them then.

When they fail they slow down, and you can start to feel a slight flutter at idle.

(FWIW - I worked on OBDII systems for one of the Big 3 for 3 years)
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  #6  
Old 01-18-2013, 07:35 AM
kgorczyn kgorczyn is offline
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Thanks - I'll let my 1/4 million mile O2 Sensors at work a while longer
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