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  #1  
Old 12-18-2022, 09:36 PM
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Location: Ontario, Canada
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2004 X5, 3.0i - Engine light Oxygen Sensors

Hi Everyone,
I have the codes shown below and its related Freeze Frame.
Does this mean that I have to replace all 4 Oxygen sensors?
Your insights much appreciated.
Thanks

Trouble Codes
Fault Code Status Description
EB DME: Trimming, oxygen sensor before cat., bank 1
EC DME: Trimming, oxygen sensor before cat., bank 2


Freeze Frame
Name Value Unit
DTC that caused required freeze frame data storage P1093
Fuel system A status CL
Fuel system B status CL
Calculated load value 29.8 %
Engine coolant temperature 79 C
Short term fuel trim -bank 1 11.7 %
Long term fuel trim - bank 1 0 %
Short term fuel trim -bank 2 10.9 %
Long term fuel trim - bank 2 0 %
Engine RPM 2024 rpm
Vehicle speed sensor 34 km/h
Ignition timing advance for #1 cylinder 26
Intake air temperature 28 C
Air flow rate from mass air flow sensor 21.7 g/s
Absolute throttle position 12.2 %
Commanded secondary air status OFF
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  #2  
Old 12-19-2022, 08:36 AM
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Location: Boston, MA
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Effduration is on a distinguished road
It’s possible, but I don’t think it’s likely. It’s rare they fail at same time.

I think you have a problem with fuel trims, rich or lean but most likely lean..
The fuel trim data listed in “snapshot” above is a little suspicious. S/T above 10% an L/T at 0%…that’s kind of doubtful.

It could be something as simple as a torn intake boot (have a look) or vacuum leak causing a lean condition, but it could also be many other things.

I’d suggest a consult with a proper non-dealer BMW specialist fir this.
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  #3  
Old 12-19-2022, 10:33 AM
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Rear O2 sensors are rarely changed compared to front ones. Rears fail due to bad FT over long periods of time. Front ones take a lot of abuse. It's adding too much fuel. Good sign it's a vacuum leak.
Check the O2 sensor voltages. Do readings oscillate?
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  #4  
Old 12-19-2022, 11:43 AM
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Thank you guys. How about MAF, could that be a culprit?
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  #5  
Old 12-19-2022, 11:53 AM
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Suddenly adding a bunch of fuel suggests either a vacuum leak or a failing fuel pump to me.

Could it be a MAF? Sure. But that's not my first choice. I'd be doing a fuel pressure test and looking for vacuum leaks first, though.
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Old 11-12-2023, 09:45 PM
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Any updates to this forum? I am having the same two error codes on my car. I had it smoked, but did not see any leaks. I did the CCV replacement but that hasnt fixed it. At 216k miles, I am kinda ok driving around with a check engine light... but maybe this is fixable,

I have seen suggestions of clogged injectors, and I never use any injector cleaner... but wouldn't that have misfires codes along with it?
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