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Old 01-22-2020, 01:24 PM   #1
rmassoud
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Hi guys I just wanna share my experience with my own e46, am a car electrician so I must say am freaking lucky otherwise if I was a customer I would had a nightmare. To cut the story short I had my car giving me all sorts of issues, including loss of power and general drivabilty issue on a scanner I would get mixed messages from fuel trim to o2 sensors I turn them off an hour later they turn on all of a sudden I turn on the car and I have gear icon on dashboard and car drives on 3rd gear LIMP Mode, I tried accessing the TCM I was not able I can only access DME or anything else, now being electrician came as a bless, borrowed a TCM module didn't make a difference, unplugging transmission plugs and still no access, I noticed a burnt fuse on EBOX installed a new one the car worked perfectly for few seconds then the fuse blew, I determined I had a short somewhere started isolating main cables untill I found the 4 cables going to o2 BANK 2 sensor has touched the manifold and they are melted together, I cut the wires installed the fuse and YES everything worked perfectly, rewired the burnt wired and isolated everything and now the car is back to it's original stated which was perfect with no MIL or SES messages at all, so their u go if u face the same thing don't start crying as I did thinking I had to replace a full transmission body


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Last edited by rmassoud; 01-22-2020 at 01:31 PM.
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Old 01-22-2020, 01:43 PM   #2
PabloCruise
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Excellent! Glad you found it!
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Old 01-22-2020, 03:53 PM   #3
HarleyRob
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Originally Posted by rmassoud View Post
Hi guys I just wanna share my experience with my own e46, am a car electrician so I must say am freaking lucky otherwise if I was a customer I would had a nightmare. To cut the story short I had my car giving me all sorts of issues, including loss of power and general drivabilty issue on a scanner I would get mixed messages from fuel trim to o2 sensors I turn them off an hour later they turn on all of a sudden I turn on the car and I have gear icon on dashboard and car drives on 3rd gear LIMP Mode, I tried accessing the TCM I was not able I can only access DME or anything else, now being electrician came as a bless, borrowed a TCM module didn't make a difference, unplugging transmission plugs and still no access, I noticed a burnt fuse on EBOX installed a new one the car worked perfectly for few seconds then the fuse blew, I determined I had a short somewhere started isolating main cables untill I found the 4 cables going to o2 BANK 2 sensor has touched the manifold and they are melted together, I cut the wires installed the fuse and YES everything worked perfectly, rewired the burnt wired and isolated everything and now the car is back to it's original stated which was perfect with no MIL or SES messages at all, so their u go if u face the same thing don't start crying as I did thinking I had to replace a full transmission body


Regards

Glad you figured it out! Know that was a good feeling!

I had something similar when a 330ci I sold to my son's friend came up limp. (after he had owned for year and half) My son found out he was about to take the car to the scrap yard and I called him up and offered to buy it back. After getting home and deciding I didn't have time to fool with it I sold it to another e46 fanatic as he was looking for a track car. I actually delivered the car to him and 45 minutes after leaving and heading home he called and asked me if I wanted the car back as he had solved "limp mode". Turns out the o2 cable had gotten pinched ever so slightly between the rear valve cover and block during a VCG replacement some time back. My son's friend never had the VCG replaced (nor did I before selling). So it is no telling how long it actually took to rub through the outer insulation and eventually the wires themselves causing them to melt, blow the fuse, and cause limp mode.

So to your point, don't cry just yet, as there may be a somewhat "simple" fix.
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Old 01-22-2020, 04:29 PM   #4
PabloCruise
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Originally Posted by HarleyRob View Post
Glad you figured it out! Know that was a good feeling!

I had something similar when a 330ci I sold to my son's friend came up limp. (after he had owned for year and half) My son found out he was about to take the car to the scrap yard and I called him up and offered to buy it back. After getting home and deciding I didn't have time to fool with it I sold it to another e46 fanatic as he was looking for a track car. I actually delivered the car to him and 45 minutes after leaving and heading home he called and asked me if I wanted the car back as he had solved "limp mode". Turns out the o2 cable had gotten pinched ever so slightly between the rear valve cover and block during a VCG replacement some time back. My son's friend never had the VCG replaced (nor did I before selling). So it is no telling how long it actually took to rub through the outer insulation and eventually the wires themselves causing them to melt, blow the fuse, and cause limp mode.

So to your point, don't cry just yet, as there may be a somewhat "simple" fix.
Did you take the car back?
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Old 01-22-2020, 06:18 PM   #5
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Good job!!!
Now try to use commas and periods to keep the post readable.

Quote:
Originally Posted by rmassoud View Post
To cut the story short I had my car giving me all sorts of issues, including loss of power and general drivabilty issue on a scanner I would get mixed messages from fuel trim to o2 sensors I turn them off an hour later they turn on all of a sudden I turn on the car and I have gear icon on dashboard and car drives on 3rd gear LIMP Mode,
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Old 01-22-2020, 06:39 PM   #6
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Massoud
Glad u figured it out.Thank you for the update.Which fuse and where is this E Box? Is this the one in the drivers side engine compartment?
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Old 01-23-2020, 01:30 AM   #7
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Which fuse and where is this E Box? Is this the one in the drivers side engine compartment?
F1-F5 in the e-box under the hood. See details here.
https://fusesdiagram.com/bmw/fuse-bo...bmw-3-e46.html
https://blog.bavauto.com/5677/bmw-e4...derhood-e-box/
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Old 01-23-2020, 02:39 AM   #8
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Good stuff, no better feeling when working on your rig. I had the same type of problem before on my m3. Oil was getting on the o2 sensor plug and causing a headache.
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Old 01-23-2020, 07:29 AM   #9
MrMCar
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Cool beans, glad you sleuthed it out.

FYI for everyone here. Old O2 sensors, the wire in particular is very useful to hold onto.
It's very hard and has an incredible coating owing to the environment it was designed to function in.
We cut the wire off when replacing O2 sensors and save.

Many a BMW has issues whereas the wires that are in the loom going from the body over to the trunk lid and/or wagon door will break, causing the failure of backup, brake lights and/or trunk lock mechanism.

When repairing such we use the leftover O2 wires as they're almost impossible to break from repeated bending.

Caveats:
The wire is extremely difficult to solder and requires much tinning to do so with the right tool.
We use high quality but connectors. Strip the coating longer than normal on both sides. Insert them far enough in so that both ends touch each other inside the connector (not too difficult, there's a space in the middle) and there is no exposed wire outside the but connector.
Heat shrink and you're done.
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Old 01-23-2020, 08:03 AM   #10
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Originally Posted by PabloCruise View Post
Did you take the car back?
Indeed I did!
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Old 01-23-2020, 01:27 PM   #11
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Thank you Balidawg!
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Old 01-23-2020, 03:28 PM   #12
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Indeed I did!
That's awesome!
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