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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 11-04-2012, 08:06 PM
autoque autoque is offline
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Question Pre-cat oxygen sensor?

The ones that are changed when something is amiss, which are they?
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  #2  
Old 11-04-2012, 08:15 PM
ard ard is online now
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you change them when they are causing issues... not guessing what is causing a transient 300 rpm blip on cold start up.

looks like the first one.
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Old 11-04-2012, 11:50 PM
autoque autoque is offline
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Yeah, well, I'm desperate. The vehicle has a three year old issue. This will likely be my last try before I give up and just live with it. Painful, but knowing I did everything I can, at least I'll have no regret.

Shouldn't it be the first one AND the second one as well? I thought they go in pairs.
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Old 11-05-2012, 07:47 AM
ard ard is online now
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I think there is one pre-cat (which is what you asked) and one post cat sensor.

Has anyone confirmed that what you are seeing is 'real' or abnormal? And not us idiots on this forum... mechanic, tech, etc?

A
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Old 11-05-2012, 03:49 PM
autoque autoque is offline
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Yeah, a BMW master tech had a look at it for two weeks, admits there's a symptom, but can't pinpoint what's wrong. Told me to come back when there's a fault code recorded or if the symptom gets worse.
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Old 11-05-2012, 07:08 PM
autoque autoque is offline
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Went to the dealer but the SA strongly dissuaded me from replacing the o2 sensor, saying a faulty o2 sensor brings drivability issues or CEL. Now all I can do is just wait for a fault code.
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