04 endeavor code po155 locaction of 02 sensor

SOURCE: where is bank 1 sensor 1 on mitsubishi endeavor

There are only V6 endeavors in the US, are you certain you do not have a 3.8L V6?


Bank 1 refers to the side of the engine that contains cylinder number 1. This is the side of the engine nearest the firewall.
Sensor 1 refers to the first sensor off the manifold, or closest to the engine.
This also is the O2 sensor that is located before the catalytic converter in the manifold. Sensor 2 is located after the catalytic converter, further down below the car.

ZJ Limited

• 17989 Answers
• Posted on Oct 02, 2010

SOURCE: CODE PO155 BANK2 SENSOR 1 WHERE IS THIS SENSOR

A code P0155 may mean that one or more of the following has happened:
* O2 Heater element resistance is high
* Internal short or open in the heater element
* O2 heater circuit wiring high resistance
* open or short to ground in the wiring harness

Possible Solutions:
* Repair short or open or high resistance in wiring harness or harness connectors
* Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2

Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2

Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.

Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.

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SOURCE: 2004 mitsubishi endeavor 3.8 p0141 code which points to 02 sensor but where is the bank 1 sensor 2 located

Locate cyl number 1 that is bank #1. Sensor #2 will be located on the portion of the exaust that corresponds to that particular bank after the catalytic convertor. Sensor before the Catalyst is refered to as #1