M-Class (W166) Produced 2012-2015

OM651 P0132

Old Oct 22, 2025 | 05:12 AM
  #1  
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2012 Mercedes-Benz ML 250 BlueTec
OM651 P0132

Hey guys, Been getting this code for a month now, clear it and comes back every time. Where is this sensor located on the car? I can't find any pics online for the OM651 engine

Regards

Amir
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Old Oct 23, 2025 | 03:27 AM
  #2  
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Originally Posted by Amirhz
Hey guys, Been getting this code for a month now, clear it and comes back every time. Where is this sensor located on the car? I can't find any pics online for the OM651 engine

Regards

Amir
Have you looked for it yet where I suggested. If you clear it and it comes back there is an issue with it. You either need to try replacing the O2 sensor or check the wiring to it.


7

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The Mercedes W166 OM651 P0132 code indicates an "Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 1)," meaning the upstream oxygen sensor on the first bank of the engine is sending a signal that is consistently too high. This usually points to a faulty sensor, a wiring problem, or a rich air-fuel mixture condition caused by other issues like fuel injectors. The primary fix is to diagnose and replace the faulty O2 sensor or repair the wiring, but a mechanic should also inspect for underlying fuel system issues.
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Old Oct 23, 2025 | 05:27 AM
  #3  
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I saw your reply but I asked in the other forum if you have a pic of the location as I couldn't find it
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Old Oct 23, 2025 | 05:45 AM
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Originally Posted by Amirhz
I saw your reply but I asked in the other forum if you have a pic of the location as I couldn't find it
Try looking here on your exhaust system after the turbo.

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Old Oct 23, 2025 | 10:24 PM
  #5  
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Thanks mate found it

What a **** spot though, it's right next to the chassis leg so barely any room to fit tools plus air box is on top

I'll figure out sometime how to remove it lol
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Old Oct 23, 2025 | 10:30 PM
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Originally Posted by Amirhz
Thanks mate found it

What a **** spot though, it's right next to the chassis leg so barely any room to fit tools plus air box is on top

I'll figure out sometime how to remove it lol
Think that’s bad try working on an Audi. No consideration to the old mechanic at all 😂
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Old Oct 24, 2025 | 12:39 AM
  #7  
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Originally Posted by Mattml430
Think that’s bad try working on an Audi. No consideration to the old mechanic at all 😂
I know mate, own a 2013 Touareg personally😂
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Old Oct 24, 2025 | 01:27 AM
  #8  
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2014 ML63, 2018 GLC43, 1929 DB victory six sports roadster
Originally Posted by Amirhz
I know mate, own a 2013 Touareg personally😂
You know exactly what I mean then. I’m just doing the EGR and turbo on a Q5 and the alternator on a Q7. ****s of things
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Old Nov 1, 2025 | 06:16 AM
  #9  
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Originally Posted by Mattml430
You know exactly what I mean then. I’m just doing the EGR and turbo on a Q5 and the alternator on a Q7. ****s of things
***Update*** It ended up being the O2 sensor, one of the wires was a bit torn as it had torn through the main grey casing through to the wire casings All fixed now
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