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E46 O2 Sensor Error
#1
Hallo all,

I have run the diagnostics and my E46 2002 throws out the error post cat O2 sensor going to ground. Where are the most common places where the wire will be going to ground from the ECU/DME to where the sensor plugs in? 

Also can I eliminate this error by using the unused Pre-cat sensor wires instead of the post cat sensor wires coming from the DME?

Thanks in advance  Praise
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#2
I often read your posts and go WTF.

If your sensor is faulty either replace it or get the car flashed with software so its coded out.
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#3
This is a common error.

Easy fix. Just get some old speaker rip cord, tie one end to the left reverse light, and the other end to the no.2 spark plug.

No need to use solder or anything.

You gonna have to run the wire through the cabin, which is a bit of a PITA, but hey, it will save you some moneys, so worth it!
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#4
(30-06-2020, 02:53 PM)VictorMike Wrote: This is a common error.

Easy fix. Just get some old speaker rip cord, tie one end to the left reverse light, and the other end to the no.2 spark plug.

No need to use solder or anything.

You gonna have to run the wire through the cabin, which is a bit of a PITA, but hey, it will save you some moneys, so worth it!

I hope people see the fun you making in this, because I imagine someone is going to follow your advice. Some people have the sense of humor needed to understand your post, many don't!
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#5
(30-06-2020, 02:58 PM)Tinuva Wrote:
(30-06-2020, 02:53 PM)VictorMike Wrote: This is a common error.

Easy fix. Just get some old speaker rip cord, tie one end to the left reverse light, and the other end to the no.2 spark plug.

No need to use solder or anything.

You gonna have to run the wire through the cabin, which is a bit of a PITA, but hey, it will save you some moneys, so worth it!

I hope people see the fun you making in this, because I imagine someone is going to follow your advice. Some people have the sense of humor needed to understand your post, many don't!

And that, my friend, is how we separate the wheat from the chaf.
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#6
(30-06-2020, 02:07 PM)GPGrobler Wrote: Also can I eliminate this error by using the unused Pre-cat sensor wires instead of the post cat sensor wires coming from the DME?

please explain this again... you kinda lost me here...
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#7
(30-06-2020, 03:07 PM)Kish2604 Wrote:
(30-06-2020, 02:07 PM)GPGrobler Wrote: Also can I eliminate this error by using the unused Pre-cat sensor wires instead of the post cat sensor wires coming from the DME?

please explain this again... you kinda lost me here...
The M54 has four oxygen sensor wires coming from the DME, two are unused/blocked off the other two are attached to the post cat oxygen sensors, the M54 has four wires but only two sensors.

The wire(s) of one of the sensors in use coming from the DME is going to ground, so you can "flash" the car and replace oxygen sensors until you go Blue in the face, it will not clear the error.

(30-06-2020, 02:26 PM)Nikhil Wrote: I often read your posts and go WTF.

If your sensor is faulty either replace it or get the car flashed with software so its coded out.
The wires of the one sensor are grounded, replacing the sensor and flashing the DME does not clear the error.
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#8
(01-07-2020, 01:17 PM)GPGrobler Wrote:
(30-06-2020, 03:07 PM)Kish2604 Wrote:
(30-06-2020, 02:07 PM)GPGrobler Wrote: Also can I eliminate this error by using the unused Pre-cat sensor wires instead of the post cat sensor wires coming from the DME?

please explain this again... you kinda lost me here...
The M54 has four oxygen sensor wires coming from the DME, two are unused/blocked off the other two are attached to the post cat oxygen sensors, the M54 has four wires but only two sensors.

The wire(s) of one of the sensors in use coming from the DME is going to ground, so you can "flash" the car and replace oxygen sensors until you go Blue in the face, it will not clear the error.

(30-06-2020, 02:26 PM)Nikhil Wrote: I often read your posts and go WTF.

If your sensor is faulty either replace it or get the car flashed with software so its coded out.
The wires of the one sensor are grounded, replacing the sensor and flashing the DME does not clear the error.

Are you 100% sure about that?

I see on https://www.ms4x.net/index.php?title=Siemens_MS43 you can effectively disable full load detection (which learn from the O2 sensors) by setting the lower limit for FL detection to 8160 rpms.

So its not just a flash, its a flash after changing a very specific parameter.

Correct me if I am wrong, I obviously never done this myself.
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#9
Short to ground normally means there is a problem within the sensor
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#10
Update, Pre cat wires not working, both give the same error as the active (in use) faulty sensor wire.

(30-06-2020, 02:53 PM)VictorMike Wrote: This is a common error.

Easy fix. Just get some old speaker rip cord, tie one end to the left reverse light, and the other end to the no.2 spark plug.

No need to use solder or anything.

You gonna have to run the wire through the cabin, which is a bit of a PITA, but hey, it will save you some moneys, so worth it!
I guess the people who take this advice are the same ones who believe wearing a stupid mask and sanitizing your hands will prevent you from contracting a virus. The same ones who believe that viruses will only attack you in the checkout line at Shoprite if you do not practice "Social Distancing"  Rofl Rofl
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