Kindly reminder: Finding Your Oxygen Sensor's OEM Part Number Please try to confirm the exact sensor (such as part number, sensor position) for your own car before placing the order. If for any reason you cannot find your oxygen sensor by entering your vehicle's year, make and model, you can find it by its Original Equipment Manufacturer (OEM) number. The OEM part number can be found directly on the part itself. You can also call a dealership with your VIN, and they will provide you with the OEM part number. More instruction related to Oxygen sensor can be found at the bottome of this page for your reference. MR578113 Lambda Oxygen Sensor For MITSUBISHI PAJERO MR507387 MN158916 For OE No. : MN158916 MD345230 MN158759 MR507387 MD345230 MN158759 MR507387 MD315175 MD339641 MD345230 MD365016 MN158759 MN158916 MN163492 MR507387 MR578113 Position: REAR LEFT Lambda Sensor : Heated Number of circuits : 4 Number of connectors : 4 USED FOR CAR MODELS: FOR MITSUBISHI PAJERO II (V3_W, V2_W, V4_W) 3.0 GLS V6 24V (V43W, V23W) 1994-1997 6G72 (SOHC 24V) FOR MITSUBISHI PAJERO II (V3_W, V2_W, V4_W) 3.5 V6 24V All-wheel Drive (V25W, V45W) 1994-1999 6G74 (DOHC 24V) FOR MITSUBISHI PAJERO II (V3_W, V2_W, V4_W) 3.5 V6 24V All-wheel Drive (V45W, V25W) 1997-1999 6G74 (DOHC 24V),6G74 (SOHC 24V) FOR MITSUBISHI PAJERO IV (V8_W, V9_W) 3.8 V6 (V87W) 2006- 6G75 FOR MITSUBISHI PAJERO IV (V8_W, V9_W) 3.8 V6 All-wheel Drive (V87W, V97W) 2007- 6G75 INSTRUCTIONS RELATED TO O2 Oxygen SENSOR 1. Oxygen sensor is located on the exhaust line. Oxygen sensors located before the catalytic converter are known as upstream sensors(FRONT), while oxygen sensors located after the catalytic converter are called downstream sensors(REAR). Upstream sensors are usually more sophisticated because their role is to report to the ECU the oxygen concentration. Conversely, the downstream sensors main function is in helping the ECU to determine the catalytic condition. 2.Knowing the location of the oxygen sensor at fault is important. The number and location of the oxygen sensors are specific to every vehicle's year, make and model. The location of the oxygen sensor is usually identified by position (sensor 1, sensor 2) and by cylinder bank (bank 1, bank 2). Bank 1 is the side of the engine where cylinder #1 is located. Bank 2 is opposite to Bank 1. Sensor 1 is the upstream sensor. Sensor 2 is the downstream sensor. In case of a four-cylinder engine, there is only one bank: bank 1. FOR EXAMPLE: 3.How many oxygen sensors does my vehicle have? This depends on your automobile's year, make and model. Older automobiles had a minimum of two sensors whereas newer automobiles can have six, eight or more oxygen sensors. 4.How do I know if my upstream or downstream oxygen sensor is bad? There are several signs that you might notice when your o2 sensor malfunctions: Reduced gas mileage Reduction in overall power A gas smell coming from the exhaust Check Engine Light Rough idle Misfire Hesitation when trying to accelerate Emission test fails _x000D_