Fault codes for O2 sensor heater and intergrated power supply. Need urgent help!!

Potatos · 08-15-2018, 10:32 PM

Got these codes after downpipe, charge pipe and spark plug install. The first code always come on and the O2 sensor heater codes follows. Anyone experienced these before? NEED HELP!!!!

Codes are:
1B5202
12B302
12B402
12B102
12B202

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Potatos · 08-16-2018, 02:08 PM

Need help！ Anyone？

4everkidd · 08-17-2018, 04:10 PM

looks like you may have twisted the wires to the O2 sensors creating a short.

Did you unplug the sensors prior to removal and install?

tinpot · 08-24-2018, 09:06 PM

This seems to be a common issue when DP's are installed. The O2 sensors are easily damaged if not disconnected first. My guess is the O2 sensor got damaged during DP install (happened to me) and needs replacing.

CAustin · 07-15-2020, 01:19 AM

Sorry to bring this up after nearly 2 years, but im struggling with the same codes after DP install.
Checked the fuses, wiring and replaced the power distribution board but still getting code 1b5202 which I believe is cause of heater faults on all 4 O2 sensors.

Potato's, did you ever find the solution to this fault?

CAustin · 07-15-2020, 02:49 PM

FOR FUTURE HELP!

Mine had damaged the Integrated Supply Module - PN 7614585. Its found left hand side of left front strut. Replaced with a used unit for £15!

Ricky_Blayz · 06-11-2021, 10:01 PM

Quote:

Originally Posted by CAustin

FOR FUTURE HELP!

Mine had damaged the Integrated Supply Module - PN 7614585. Its found left hand side of left front strut. Replaced with a used unit for £15!

Hey sorry old post so when you replaced the Integrated Supply Module, that completely fixed everything? So you had no more o2 sensor codes/and no cel? I have these same exact codes and Ive been struggling to find the fix

ICantDrive4Sht · 06-12-2021, 12:40 PM

Quote:

Originally Posted by Ricky_Blayz

Quote:

Originally Posted by CAustin

FOR FUTURE HELP!

Mine had damaged the Integrated Supply Module - PN 7614585. Its found left hand side of left front strut. Replaced with a used unit for £15!

Hey sorry old post so when you replaced the Integrated Supply Module, that completely fixed everything? So you had no more o2 sensor codes/and no cel? I have these same exact codes and Ive been struggling to find the fix

I have 12B304 code.
Will replace the O2 sensor part 11787848486 after next week.
That should fix it.

Ricky_Blayz · 06-21-2021, 09:23 PM

Quote:

Originally Posted by ICantDrive4Sht

I have 12B304 code.
Will replace the O2 sensor part 11787848486 after next week.
That should fix it.

So ive replaced that integrated supply module that the other guy changed out and it fixed everything. No more codes and cel

g2 · 08-09-2023, 05:54 AM

Where exactly is the integrated power supply? What needs to be removed to get to it? I have a 2016 m4 with the o2 heater issue.

g2 · 08-11-2023, 02:57 PM

Found it. See any issues?

08-15-2018, 10:32 PM	#1
Potatos New Member 9 Rep 14 Posts Drives: 17 340Xi 17 M3 30Jahre Join Date: Nov 2017 Location: Winnipeg iTrader: (0)	Fault codes for O2 sensor heater and intergrated power supply. Need urgent help!! Got these codes after downpipe, charge pipe and spark plug install. The first code always come on and the O2 sensor heater codes follows. Anyone experienced these before? NEED HELP!!!! Codes are: 1B5202 12B302 12B402 12B102 12B202 Last edited by Potatos; 08-15-2018 at 11:56 PM..
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08-16-2018, 02:08 PM	#2
Potatos New Member 9 Rep 14 Posts Drives: 17 340Xi 17 M3 30Jahre Join Date: Nov 2017 Location: Winnipeg iTrader: (0)	Need help！ Anyone？
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08-17-2018, 04:10 PM	#3
4everkidd Major 646 Rep 1,336 Posts Drives: F80 AY M3 Join Date: Apr 2016 Location: Calgary iTrader: (1)	looks like you may have twisted the wires to the O2 sensors creating a short. Did you unplug the sensors prior to removal and install?
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08-24-2018, 09:06 PM	#4
tinpot Captain 74 Rep 722 Posts Drives: 2015 F82 M4 Join Date: Sep 2009 Location: Houston, Texas iTrader: (3)	This seems to be a common issue when DP's are installed. The O2 sensors are easily damaged if not disconnected first. My guess is the O2 sensor got damaged during DP install (happened to me) and needs replacing.
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07-15-2020, 01:19 AM	#5
CAustin Registered 2 Rep 3 Posts Drives: BMW F80 Join Date: Jul 2020 Location: Leeds iTrader: (0)	Sorry to bring this up after nearly 2 years, but im struggling with the same codes after DP install. Checked the fuses, wiring and replaced the power distribution board but still getting code 1b5202 which I believe is cause of heater faults on all 4 O2 sensors. Potato's, did you ever find the solution to this fault?
	Appreciate 0 Quote

07-15-2020, 02:49 PM	#6
CAustin Registered 2 Rep 3 Posts Drives: BMW F80 Join Date: Jul 2020 Location: Leeds iTrader: (0)	FOR FUTURE HELP! Mine had damaged the Integrated Supply Module - PN 7614585. Its found left hand side of left front strut. Replaced with a used unit for £15! Attached Images
	Appreciate 1 TopJimmy5449.50 Quote

08-09-2023, 05:54 AM	#10
g2 Private First Class 22 Rep 145 Posts Drives: E30 24V Join Date: Oct 2007 Location: Atlanta iTrader: (0)	Where exactly is the integrated power supply? What needs to be removed to get to it? I have a 2016 m4 with the o2 heater issue.
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08-11-2023, 02:57 PM	#11
g2 Private First Class 22 Rep 145 Posts Drives: E30 24V Join Date: Oct 2007 Location: Atlanta iTrader: (0)	Found it. See any issues? Attached Images
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