Question about 2002 Mitsubishi Montero Sport

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Code P0158 I replaced one O2 sensor three weeks ago and my check engine light is lit again. Which sensor is Bank2 Sensor2 ? Once installed I'm supposed to flash the computer, whats that? I just unplugged the battery to restart the computer.

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Bank 2 sensor 2 is the post-catalytic converter O2 sensor on (usually) the driver's side. It's the sensor that the car uses to monitor the efficiency of the catalytic converter. Whichever side of the engine has cylinders 4, 5, and 6 is bank 2 (you'll probably find that information on a decal underhood). Flashing the computer could be as easy as what you're doing (resetting by disconnecting the battery), or it may involve a more detailed process including diagnostic software. It's most likely though that what you are doing is all that's required - disconnecting the battery for 30 minutes or so puts the ECU back into learn mode, and it basically starts fresh to relearn the engine's operating parameters.

Posted on Sep 25, 2008

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