I have 2002 mitsubishi montero sport 3.5L with a check engine code for O2 sensor no circuit activity Bank 2 Sensor 1. Any Help?

Bank 1 is the passenger side, so yes, the left side at you stand in front and face the windshield..

https://mitsubishiforum.com/forum/mitsubishi-montero-montero-sport-14/o2-sensor-bank-2-a-30747/

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MR988905 costs $300+

SNG O2 sensor is just below $100

they may claim being made with the same quality and both are tagged "direct fit" for easy installation.

its just my idea, good luck.

No it has nothing to do with the cat.
Code 161 is for a problem with the heater circuit for sensor 2 bank two. Either the heater in the sensor has failed, or the circuit that powers the heater is not working.

Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).

with those codes showing, it could be either bad O2 sensors or there is a problem with the wiring to those sensors. Also, the wrong sensors may be installed. I'm assuming codes P0134, P0135, P0155.

For others viewing this:

P0134 = O2 sensor circuit-no activity detected (bank 1 sensor 1)

P0135 = O2 sensor heater circuit malfunction (bank 1 sensor 1)

P0155 = O2 sensor heater circuit malfunction (bank 2 sensor 1)

P0130 - O2 Sensor Circuit Bank 1 Sensor 1
P0135 - O2 Sensor Heater Circuit Bank 1 Sensor 1

Here is a visual aide that will clear up the confusion on where the affected sensor is located.

P0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
this could be a fluke code I would earse it and see if it comes back before putting the sensor in there not cheap. Bank 2 means witch side of the engine bank 1 is the side that #1 cylinder is on bank 2 is the other side sensor 1 means upstream above the catalytic converter on the engine side sensor 2 is below the catalytic converter

Hi Garcha,

Both codes relate to O2 Sensor # 2

Code P0139: O2 Sensor Circuit Slow Response - Bank 1, Sensor 2
Code P0140: O2 Sensor Circuit No Activity Detected - Bank 1, Sensor 2

A faulty O2 sensor will mean incorrect signals will be sent to the EFI computer, causing erratic engine running.


Cheers,


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Replace the oxygen sensor. Left side, before cat converter.

P0154 HO2S-11 (Bank 1 Sensor 1) No Activity Detected
P0174 Fuel System Lean (Bank 2)