2001 Mitsubishi Eclipse Spyder Oxygen Sensor Direct Fit (part#234-4738)

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This Denso Oxygen Sensor Direct Fit, Part No. 234-4738 is an exact fit for your 2003 Mitsubishi Diamante. This is an upstream sensor. Code P0155: refers to the front oxygen sensor on Bank 2 of the vehicle. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the oxygen sensor heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM (Engine Control Module) tracks how long it takes for the oxygen sensor to begin switching. If the ECM determines (based on coolant temperature) that too much time elapsed before the oxygen sensor began operating properly, P0155 is set., SYMPTOMS: Most likely to notice poor fuel economy the illumination of the MIL., CAUSES: oxygen sensor heater element resistance is high, Internal short or open in the heater element, oxygen sensor heater circuit wiring high resistance, open or short to ground in the wiring harness., POSSIBLE DIAGNOSTIC: Repair short or open or high resistance in wiring harness or harness connectors., Replace oxygen sensor.
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Yes, this part fits your 2000 Mitsubishi Galant 4 cycle (I-4 2.4L). The mounting location of this part should be Passenger Side, Before Catalytic Converter. CODE P0420: The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be. It is part of the vehicle emissions system. SYMPTOMS: You will not notice any drivability problems, although there may be symptoms. CAUSES: code P0420 may mean that one or more of the following has happened: 1). Leaded fuel was used where unleaded was called for, 2). An oxygen sensor is not reading (functioning) properly, 3). The engine coolant temperature sensor is not working properly, 4). Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe, 5). Retarded spark timing, 6). The oxygen sensors in front and behind the converter are reporting too similar of readings. POSSIBLE DIAGNOSIS: Some suggested steps for troubleshooting a P0420 error code: Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady). Inspect the downstream heated oxygen sensor, replace if necessary, Replace the catalytic converter

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bank 1 has number one cylinder on its side.