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P0155 and P0161, 2001 Mitsubishi Montero 3.5 limited


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Chanuka4
New User

Oct 18, 2021, 1:31 AM

Post #1 of 3 (1265 views)
post icon P0155 and P0161, 2001 Mitsubishi Montero 3.5 limited Sign In

Hello Guys, recently my Mitsubishi Montero 2001 limited 3.5 v6 displayed Service engine light, I checked with the OBDII tool and two codes poped up, p0155 and p0161 which are O2 sensor fault codes, (bank 2 1&2 sensor) I replaced both of them, but fault codes still stay on, I checked wiring, it seems fine, checked fuses, but this model doesn't have a fuse for o2 sensors, I also reseted the ECU, still nothing, I am stumped, if anyone has encountered this problem or knows how to deal with it please help.

Thank you


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 18, 2021, 3:48 AM

Post #2 of 3 (1249 views)
Re: P0155 and P0161, 2001 Mitsubishi Montero 3.5 limited Sign In

Yes, they do have a fuse but that fuse runs though the PCM so it will not be marked clearly.

Your problem is with the heater circuit of the 0/2s on the driver's side of the engine.

Your best approach is to check at the sensor for power and ground to determine which one is missing. If it turns out to be power, then you have to go back and test all the fuses with a test light with the key on.

The power wire is black and the ground is white. Unplug the sensor to test the plug.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 18, 2021, 3:49 AM)


Chanuka4
New User

Oct 18, 2021, 6:02 AM

Post #3 of 3 (1235 views)
Re: P0155 and P0161, 2001 Mitsubishi Montero 3.5 limited Sign In

Ok, thanks. will check that out.






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