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Old 08-08-2013, 08:57 AM   #1
bmwci323
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E46 p0155, o2 changed. Code still apparent

Hey guys,

My car threw a p0155 o2 heater circuit malfunction(bank 2, sensor 1) code a few months ago.
Yes, Iam finally dealing with it now.

So, which seemed obvious.. I changed the bank 2 precast sensor. Cleared the code , started thee motor and the code was back, I was a little shocked , so I even did it again. Same outcome..

Seeing as though the o2 sensors wire runs behind the motor, could it be loose on the other end? Or make ripped where I can't see it?

Any help appreciated!
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Old 08-08-2013, 09:12 AM   #2
jfoj
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Sometimes these codes can be a bit misleading.

First you need to check fuses, not sure if there are individual fuses for Heated O2 sensors or a single fuse.

Then you need to test to see if you actually have power at the O2 sensor connector.

You can also verify that the O2 sensor heater has continuity. Most sensors are 4 wire sensors, 2 wires are the sensor and 2 wires are for the heater. You can search around and see what colors are typically uses for the heater circuit.

What brand sensor did you purchase? I always use Bosch sensors and have very good luck with them.
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Old 08-08-2013, 09:31 AM   #3
bmwci323
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I agree with you ib misleading, usually.
I'll see what I have for fuses.

I have the proper voltage / ohmeter testing equipment, so would I want to unplug the harness and touch the prongs to each socket? (for the harness that leads to the DME , not the o2 sensor)

The new sensor was also Bosch !

Last edited by bmwci323; 08-08-2013 at 09:54 AM.
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Old 08-08-2013, 11:34 AM   #4
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I had to clear the code after replacing it, no lights or problems 1.5k later. Post cat btw. Lol, never mind read your entire post, I'm with the other guys, make sure the circuit itself isn't toast, because no matter how many sensors you put in, nada.

Last edited by GuiltySpark; 08-08-2013 at 11:35 AM.
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Old 08-08-2013, 02:01 PM   #5
bmwci323
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Quote:
Originally Posted by GuiltySpark View Post
I had to clear the code after replacing it, no lights or problems 1.5k later. Post cat btw. Lol, never mind read your entire post, I'm with the other guys, make sure the circuit itself isn't toast, because no matter how many sensors you put in, nada.
The heater wireing circuit?
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Old 08-18-2013, 04:13 PM   #6
bmwci323
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I definitely know it is the o2 sensor harness for sure.
I even switched around the harnesses and the code remained the same for that harness..
I have chased the wiring all the way to the ecu.
There are various small burn marks, but none penetrated the insulation..

Iam unsure where to go from here? Is there a relay or fuse for a single 02 sensor? I couldn't find anything online that suggested it.
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Old 08-18-2013, 04:35 PM   #7
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Possible valve cover pinch damage? This seems to be a common problem at times.

The heater circuit is only 2 wires per sensor, ground and positive feed.

Problem is the O2 sensor heaters do not run all the time.

Luckily since you have 2 banks, you can compare readings and behavior with the good bank and maybe figure out what is going on?
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Old 08-18-2013, 04:58 PM   #8
bmwci323
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Not sure about the pinch your talking about?
I can chase the wire freely all the way to the black box on the driver side.

I was tried checking the prongs on the harness with a voltmeter/ohmeter. But I don't know what to look for, nothing was coming up.
Do I have to wait until the motor is at running temp for any readings?
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Old 08-19-2013, 05:47 AM   #9
jfoj
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Heat O2 sensors work mainly at cold start up. There has been some discussion that they may turn on at extended idle under certain conditions, but do not bank on that.

So you likely will see the O2 heater on for only the first 1-3 minutes at cold start.

You could measure the good side to see if what pins have 12 Volt output and then compare to the bad side.

I have read where sometimes people replacing the valve cover gasket have pinched the O2 sensor wires under the valve cover when reinstalling the valve cover. This can damage the insulation. I have also heard problems where mice or rodents have chewed the wiring as well on cars.

Sounds like you have a break in the heated O2 wiring for the bank than it throwing the code?
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-23-2013, 08:33 PM   #10
bmwci323
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*** PrObLEm SOLVED!!***

I ended up cutting the heat insulation wrapped around all the wires, and I found all of the wires burnt together , and one of them cut .
I fixed the wire, code gone. And for good!
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