1 series O2 sensor query

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1 series O2 sensor query

Post by hap » Fri Aug 14, 2015 2:52 pm

Rough starting in morning intermittent no fault codes except O2 sensor my mech thinks this wouldn't cause rough starts
No other codes of timing etc
Will be 200 to change n no guarantee it will solve it

Any advice please

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Post by hap » Sun Aug 16, 2015 10:00 am

Anyone please??
Rough again this am 11 degrees shaking and misfire.had to turn off n back on to get it going
Don't want to spend changing O2 if it won't solve it
Thanks

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Post by Bat » Sun Aug 16, 2015 10:12 am

Hi,
On older models it made no difference to cold running as the sensor had to warm up first.
I've got no experience of the 1 series though..
Have you got access to diagnostic gear to check live data from cold start up?
Cheers,
Gavin :)

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Post by hap » Sun Aug 16, 2015 10:45 am

Thanks Gavin I don't but it's had only O2 sensor going bad or something like that it's 2004 car they cleared it and came back with O2 nothing about coils or misfire codes but as it gets colder it will struggle massively as we ain't even in winter and frosty mornings

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Post by John_C » Sun Aug 16, 2015 1:49 pm

I think you've got to start there really, I had a bit of a google which suggests a bad pre-cat O2 sensor can give the symptoms you're experiencing but nothing concrete.

If that's the only fault code you're seeing I can only suggest fixing it and then going from there. Either way if it's throwing a code on the sensor then it needs replacing. :(
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Post by hap » Sun Aug 16, 2015 2:15 pm

Thanks I just have a feeling I'll do it and the cold starts will still be an issue but guess may need to do it to rule it in or out
Thanks all

Normal day to day is fine only on damp coldish mornings but it's never had a warning light either which doesn't help diagnostics

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Post by Bat » Mon Aug 17, 2015 10:20 pm

Hi,
Not all fault codes will put the light on. Might be worth getting the codes read again...
Cheers,
Gavin:)

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Post by hap » Mon Aug 17, 2015 10:24 pm

Funny thing it was coldish with dew on the car and guess what......no shakes nothing at all!!
So as you can seeu dilemma in spending cash when it may not be that
Fed up😢

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Post by John_C » Tue Aug 18, 2015 11:35 am

Been thinking about this, and it depends on what the O2 sensor code is. Sounds almost like an intermittent air leak, that could throw the O2 sensor reading out. What's the exact fault code? The O2 sensor might not actually be failing, might just be reading outside of the range.

If the pre-cat and post-cat O2 sensors are the same part then swapping them might be the way to go - if the fault doesn't follow the sensor then it's not a sensor issue.
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Post by drewjak » Tue Aug 18, 2015 7:00 pm

I would also agree that an air leak seems the likely culprit
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Post by hap » Tue Aug 18, 2015 8:39 pm

O2 sensor aging or summit like that
Where would air leak likely to be ?
Thanks chaps

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Post by MCB » Tue Aug 18, 2015 9:24 pm

You can try spraying "Easy Start" on your pipes and around your gaskets. As soon as you notice a rise in engine revs you have found the air leak :D
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Post by Bat » Wed Aug 19, 2015 7:52 am

Hi,
Looking at your post again you say it was missing, then you switched it off and restarted it.
Did it run cleanly from the moment you restated it?
Cheers,
Gavin :)

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Post by hap » Wed Aug 19, 2015 3:54 pm

Yes it did Gavin
Today started fine no issues!!

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Post by hap » Sat Sep 12, 2015 6:17 pm

More updates
Few cold start probs dying revving nothing happening but partner said at junction stopped and went to go and car had cut out no lights on dash
Today the yellow engine light came on and she has told me leaving work the light has stayed on

Could it still be O2 sensor

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