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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
c4s335i
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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 c4s335i; 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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