Question about 2000 Mitsubishi Galant

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Oxygen sensor 2000 galant

Check engine light is on - code is PO125 - bank two, sensor one. Which sensor is this?

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The first sensor closest to the exhaust manifold is for the air to fuel ratio. The second one if it has one will be further downstream and checks to see if exhaust is plugged.

Is your car running right especially at idle????

Posted on Jan 20, 2009

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Engnine light on code reads po135 bank 1 sensor 1 02 sensor where is that located

Posted on Apr 06, 2009

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1 Answer

Position of oxygen sensors


all you have to do is follow the exhaust from the manifold back and you will come to the sensors. bank 1 O2 sensor is on the bank cylinder 1 is and bank 2 O2 sensor is located on the bank cylinder 2 is on. the first sensors you come across is sensor 1 then the next sensor you come across sensor 2 and so on. so you can have a sensor code like bank 1 sensor 2 meaning the sensor on bank one but the sensor is the 2nd sensor in the exhaust.

Jun 25, 2015 | 2002 Mitsubishi Galant

1 Answer

Why the codes po125 & po135 &po155 keep coming back?


Hi there:

DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level).


DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
or
DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

A code P0135 and 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

In order to solve just...
  • 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)


  • Hopoe this helps.

    Aug 28, 2012 | 1999 Toyota Sienna

    1 Answer

    P0421 warm up catalyst...below threshold (bank 1).. 1st of all, what is BANK 1 and is P0421specific to the problem or it is just a general code for cat converter or oxygen sensor


    A v-6 or v-8 engine will have two banks. Bank one is the side of the engine with the number 1 cylinder. Bank 2 is the other side of the engine. In your case Bank 1 is cylinders 1-3-5 on the back side of the engine closest to the firewall. Bank 2 is cylinders 2-4-6 on the other side of the engine.

    You have two cats bank 1 and bank 2. There are two oxygen sensors before each cat that help determine fuel trim and are refered to as sensor 1 and two oxygen sensors after the cats that monitor cat efficiency and are referred to as sensor 2. The bank 1 sensor 2 O2 sensor is either providing a higher than expected signal or is switching like the sensor 1 O2's. If either of these has occurred the PCM detects that the cat is no longer working as it should and sets the code/turns on the check engine light.

    9 times out of 10 it is a cat that has gone bad.

    Nov 16, 2010 | 2002 Mitsubishi Galant

    1 Answer

    I would like to know the location of the bank1 sensor2 oxygen sensor in the Mitsubishi galant 3.0 - 2001 engine light came on and error code P0141


    Bank one sensor is going to be in the front of your catalytic converter and bank two will be to the rear of it. This way your ECM knows how well the cat is working. It will read the oxygen content before the cat and then after.

    Jul 05, 2010 | 2002 Mitsubishi Galant

    2 Answers

    Code p0332 and p0420


    16716/P0332 - Knock Sensor 2 (G66): Signal Too Low Possible Symptoms
    • Irregular rpm
    • Drivability problems
    • Loss of power
    • Engine damage
    Possible Causes
    • Circuit G66 short to Ground
    • Circuit G66 open
    • G66 improperly torqued
    • G66 damaged
    • Control Module damaged
    16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible Causes
    • Leakage in Intake and/or Exhaust System
    • Catalyst faulty
    • Oxygen Sensor(s) faulty
    • Oxygen Sensor(s) Control faulty
    Possible Solutions
    • Check Intake and Exhaust System for Leaks
    • Check Catalyst
    • Check Oxygen Sensor(s)
    • Check Oxygen Sensor(s) Control
      • Perform Oxygen Sensor(s) Aging Check

    May 03, 2010 | 2000 Chevrolet Monte Carlo

    2 Answers

    2005 gallant with O2 sensor engine light is one...how do I fix it?


    have the engine light code scanned, and it'll tell you if it's bank 1 sensor 1, bank 1 sensor 2, bank 2 sensor 1, bank 2 sensor 4.

    Bank 1 is on the same side as Cylinder 1
    Bank 2 is on the opposite side of Cylinder 1

    Sensor 1 is located before the catalytic converter.
    Sensor 2 is located after the catalytic converter

    Sep 11, 2009 | 2001 Mitsubishi Galant

    1 Answer

    Code po157 what does it mean and how do i fix it?


    P0157 Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2)

    I would try replacing the Oxygen sensor, then clear the code.

    The O2 sensor would be the after the catalytic converter ( sensor 2) on the exhaust pipe of the number 2 cylinder uses ( bank 2).

    May 18, 2009 | 2001 Mitsubishi Galant

    1 Answer

    Oxygen sensor 2000 galant


    Try replacing the gas tank cover. Seriously. If that does not work, it could be the clutch sensor.

    May 04, 2009 | 2002 Mitsubishi Galant

    1 Answer

    2000 mitsubishi galant


    If you have changed out the parts and still get the codes you probably need to have the ECM reset. The dealer can do that for you or a repair shop that has the scan tool.

    Jun 20, 2008 | 2000 Mitsubishi Galant

    1 Answer

    Check engine light is on. The error code is P0420. Catalyst efficiency below threshold (Bank 1). Had converter checked and it was ok. There is a oxygen sensor before the converter and one after the...


    ok the bank 1 is where the cilinder one is get a firing order and see where is the number one cylinder that's the bank one
    then follow the exaust and replace the sensor after the catalitic
    or converter

    May 29, 2008 | 2000 Mazda Protege

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