o2 sensor problem? Code P0154 and P0174

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o2 sensor problem? Code P0154 and P0174

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Mitsubishi >> Mitsubishi Models >> Mitsubishi Montero & Montero Sport >> o2 sensor problem? Code P0154 and P0174

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o2 sensor problem? Code P0154 and P0174 - 12/11/2006 10:52:26 AM

callgauer

Posts: 2
Joined: 12/11/2006
Status: offline

03 Montero Sport XLS 3.5L

So my Service engine Soon light came on the other day and I went to AAP and used the OBDII reader. It gave the following codes:
P0174 System too Lean (Bank 2)
P0154 o2 Sensor, CKT No Activity (Bank 2 Sensor 1)

I looked under the truck and I noticed there are 2 oxygen sensors on the passengers side where the 2 exhaust pipes coming from the engine combine into 1 pipe. There is also an o2 sensor on the drivers side.

Which sensor is bad? I am not sure what this code is referring to. Any ideas on how to fix it?

Thanks

Post #: 1

RE: o2 sensor problem? Code P0154 and P0174 - 12/11/2006 6:17:32 PM

Manybrews

Posts: 816
Joined: 5/23/2003
From: United States
Status: offline

theres actually a software upgrade that may deal with that issue. It may still require O2 sensor replacement, but the bulletin that deals with it is 04-13-002rev.
try a mitsu dealer for that update before swapping any parts.

(in reply to callgauer)

Post #: 2

RE: o2 sensor problem? Code P0154 and P0174 - 12/12/2006 9:15:00 AM

callgauer

Posts: 2
Joined: 12/11/2006
Status: offline

Ok thanks, I'll check with the tomorrow...

I stopped by the dealership this morning to find out what Bank 1 and 2 are.
On the 3.5L the sensor positions are as follows:
Bank 1 - Passenger side
Bank 2 - Driver side
Sensor 1 - Upstream
Sensor 2 - Downstream (after converter)

I'll probably check for vaccuum leaks tonight and if I can't find a leak I'll try changing the o2 sensor...

(in reply to Manybrews)

Post #: 3

RE: o2 sensor problem? Code P0154 and P0174 - 12/12/2006 6:59:33 PM

Manybrews

Posts: 816
Joined: 5/23/2003
From: United States
Status: offline

the problem with the code is that it INCORRECTLY identifies the O2 sensors. In other words, there may be a dead one, but it is NOT the one indicated.
thats part of the software update.

(in reply to callgauer)

Post #: 4