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E85 code deciphering
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E85 code deciphering
I've just ran a scan on my car with Carly and overall I really like it but sometimes it just throws back absolute nonsense.
I've swapped coils 4 (bad) with 1(good) as it was just saying number 4 was bad but now the new code makes no sense to me. The first screenshot there says cylinder 9!?
Anyone help with these?
I've swapped coils 4 (bad) with 1(good) as it was just saying number 4 was bad but now the new code makes no sense to me. The first screenshot there says cylinder 9!?
Anyone help with these?
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Maldives Blue 2.5i E85
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- enuff_zed
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E85 code deciphering
Really sorry. I can never work out what Carly is on about. Seems unnecessarily obscure.
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E85 code deciphering
I usually put straight into Google:
BMW z4 fault code 27C3
Then have a sift through the hits that come up
BMW z4 fault code 27C3
Then have a sift through the hits that come up
If the forum helped you, why not help the forum back. Thats the Z4 way!
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E85 code deciphering
Get yourself the Creator 410 plus code reader. Cheap as chips and very good at reading and resetting codes.
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E85 code deciphering
Yeah, Carly has had a bit of a funny moment here and it's driving me up the wall!
Maldives Blue 2.5i E85
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E85 code deciphering
Did this but because one of them relates to a waste gate issue, it's giving me more confusing information!
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E85 code deciphering
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E85 code deciphering
Strange
When I put them in Google and do a bit of searching I get a misfire on cylinder 4 and the next two are related to the misfire- the o2 sensors detecting an over fuel?
When I put them in Google and do a bit of searching I get a misfire on cylinder 4 and the next two are related to the misfire- the o2 sensors detecting an over fuel?
If the forum helped you, why not help the forum back. Thats the Z4 way!
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E85 code deciphering
I swapped the coil pack from cylinder 4 to 1 but then I ran the code reader again and it gave me that nonsense so not sure what's going on.
O2 sensors is something I'll check (when I find out where they are!). In the mean time I've ordered a new boot that comes from the air filter as that has a split in it. Quite a big one I may add so starting there as its very obvious that may cause a running rich error.
Maldives Blue 2.5i E85
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E85 code deciphering
So I've had more time to look into this (realise it's been a while, got hammered at work with overtime). I've replaced an air line that I thought might cause the issue as it was badly cracked. It hasn't but was nice to fix that regardless.
The codes do mention lambdo sensors. I refuse to believe it's a misfire though as it's not running rough at all. Starts up perfectly and then idles as it should. Even under load it's fine.
So next course is the sensors. But I have zero experience with these. Where are they, and how do I replace them (ie is it hard or is it a DIY job).
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- x-driver
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E85 code deciphering
There are 4 O2 (lambda) sensors on M54 engine, 2 before cats and 2 behind. The front pair is more important as it measures pure exhaust gases and determines whether the combustion is good or not. The other 2 sensors are more like extra control of the first 2.
These sensors sometimes just get dirty and give wrong measurements and therefore fault codes. The ECU will adjust combustion parameters based on O2 sensors readings so it will ajdust those wrong if it's receiving wrong data from O2 sensors.
It is however recommended to replace them in any case of troubles.
It's also recommended to use original engine sensors as most others won't work correctly. I have good experience with Bosch however, works fine on my e39 for quite some years now.
After replacing the O2 sensors you must reset engine adaptations or you will face heavy increased fuel consumption.
The front O2 sensors are accesible from top, they sit on top of each exhaust manifold, you can do it yourself but you'll need some special tools to unscrew them. Just google O2 sensor tool.
These sensors sometimes just get dirty and give wrong measurements and therefore fault codes. The ECU will adjust combustion parameters based on O2 sensors readings so it will ajdust those wrong if it's receiving wrong data from O2 sensors.
It is however recommended to replace them in any case of troubles.
It's also recommended to use original engine sensors as most others won't work correctly. I have good experience with Bosch however, works fine on my e39 for quite some years now.
After replacing the O2 sensors you must reset engine adaptations or you will face heavy increased fuel consumption.
The front O2 sensors are accesible from top, they sit on top of each exhaust manifold, you can do it yourself but you'll need some special tools to unscrew them. Just google O2 sensor tool.
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E85 code deciphering
Cheers mate. Appreciate that.x-driver wrote: ↑Fri Mar 01, 2024 2:38 am There are 4 O2 (lambda) sensors on M54 engine, 2 before cats and 2 behind. The front pair is more important as it measures pure exhaust gases and determines whether the combustion is good or not. The other 2 sensors are more like extra control of the first 2.
These sensors sometimes just get dirty and give wrong measurements and therefore fault codes. The ECU will adjust combustion parameters based on O2 sensors readings so it will ajdust those wrong if it's receiving wrong data from O2 sensors.
It is however recommended to replace them in any case of troubles.
It's also recommended to use original engine sensors as most others won't work correctly. I have good experience with Bosch however, works fine on my e39 for quite some years now.
After replacing the O2 sensors you must reset engine adaptations or you will face heavy increased fuel consumption.
The front O2 sensors are accesible from top, they sit on top of each exhaust manifold, you can do it yourself but you'll need some special tools to unscrew them. Just google O2 sensor tool.
What do you mean by engine adaptations?
I would have thought a sign of this fault would be rough idle etc. This is why this check engine light is confusing me so much because I have no other symptoms. No tough idle, no issue on start up, no lumpy running. No loss of power or limp mode.
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