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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Is the O2 sensor heater circuit fuse protected?



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      11-15-2010, 02:09 PM   #1
C4sF80M3
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Is the O2 sensor heater circuit fuse protected?

In a previous post I stated having trouble with the ecu throwing a DME code for all 4 heater circuits. Since the heater circuit is the only car supplied power circuit to the sensor, is it possible that the heater circuit is fused and no power is getting to this circuit? If so, anyone have a clue where to look?

I'm thinking that my shorted o2 sensor wire could have somehow shorted the entire heater sensor circuit. Didn't think this was possible, but it's starting to seem like the only alternative.
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      11-22-2010, 02:53 PM   #2
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Answer is yes and it's in the glove box fuse box.

Last edited by C4sF80M3; 11-23-2010 at 07:19 PM. Reason: image
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      02-22-2015, 02:17 PM   #3
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I know this is an super old thread but that looks like an e90 fuse box my e92 looks different. Same question though
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      02-23-2015, 08:11 AM   #4
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Quote:
Originally Posted by Acekid187 View Post
I know this is an super old thread but that looks like an e90 fuse box my e92 looks different. Same question though
Yes the heater circuit is fused, and the correct fuse is circled in the picture.
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      05-01-2015, 08:07 AM   #5
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Do you know where to find replacement fuses? I'm having a similar problem where I get heater circuit error codes for bank 1&2 sensor 1. I'm replacing one of the o2 sensors but I think I probably need to replace the fuse after too.
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      05-01-2015, 01:07 PM   #6
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Is it not in the same location in the glove box in the pic above circled in red?

Quote:
Originally Posted by KmndntKlink View Post
Do you know where to find replacement fuses? I'm having a similar problem where I get heater circuit error codes for bank 1&2 sensor 1. I'm replacing one of the o2 sensors but I think I probably need to replace the fuse after too.
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      05-01-2015, 03:29 PM   #7
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For my e92 it was in the mini fuse box under the hood. It's in the dme case. You will see a small black fuse box. There are YouTube videos on how to remove and open the box
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      05-01-2015, 05:39 PM   #8
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Quote:
Originally Posted by Acekid187 View Post
For my e92 it was in the mini fuse box under the hood. It's in the dme case. You will see a small black fuse box. There are YouTube videos on how to remove and open the box
Thanks guys, but do you know where to buy replacement fuses? Can you get fuses at any auto part store or does bmw being silly again with proprietary ones? I have no idea what the part # would be
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      05-01-2015, 06:02 PM   #9
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Quote:
Originally Posted by KmndntKlink View Post
Thanks guys, but do you know where to buy replacement fuses? Can you get fuses at any auto part store or does bmw being silly again with proprietary ones? I have no idea what the part # would be
Yeah auto zone or wherever
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      07-19-2015, 08:18 AM   #10
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Quote:
Originally Posted by c4s335i View Post
Answer is yes and it's in the glove box fuse box.
This is correct for any e92 335 i just swapped out the fuse and no more engine light. Fuses can be bought at autozone 30a fuse.
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      10-27-2015, 04:47 PM   #11
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O2 heater code on all four O2 sensors

For those of you getting O2 heater codes from all four sensors check the wiring to your crankcase vent heater . . that was the problem with mine. Its located under the intake with two wires going to it . . I just touched the wires with a screwdriver and they fell apart. Cost is about $90 and you need to remove the intake to get to it.
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      11-06-2015, 10:40 PM   #12
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crankcase vent heater

So my crankcase vent heater burned itself up and burned up the wires attached to it. does anyone know which of the two terminals on the vent heater is hot? They are marked terminal 1 and 2 ? If you're removing your intake manifold can you check for me? thanks! Car is 2006 330xi
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      01-26-2016, 02:26 PM   #13
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Uh so my Fuse box looks nothing like the one pictured (E92 07 335i). I'm getting a o2 sensor heater issue on all 4 sensors. I suspect it's a fuse. Anyone know what number it is?
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