Question about 2003 Mitsubishi Eclipse Spyder

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01 Eclipse GT - bad o2 sensor heater circuit (bank 1 sensor 2)

I would like to know if I can replace this sensor myself and how can I identify it's location.

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  • Marvin
    Marvin May 11, 2010

    Yes it is easy to replace.

  • Anonymous Mar 14, 2014

    bought 4 o2 sensors for 2003 Mitsubishi eclipse gt. 2 of them have different plug ins than what is on the car!



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Your question was truncated. I see that the bad sensor is on bank 1, but I can not see if it is the upstream (sensor 1) or downstream (sensor 2) sensor. The upstream sensors are mounted in the exhaust manifolds (look sort of like spark plugs) and have wires going to them.
You will need a 7/8" or 22mm wrench to remove the sensor (after disconnecting the wires). If your car has over 70,000 miles I STRONGLY suggest that you replace BOTH upstream sensors. One in each exhaust manifold.

Posted on Dec 23, 2008

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There is two of them usally one you can replace with no problems and the other is under the car after the s pipe i recommend you buy the one for your car so you dont have to splice the pigtails

Posted on Dec 23, 2008


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1 Answer

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Oxygen sensor bank 1 is the first sensor in the exhaust system. It should be located between the exhaust manifold under the hood and the catalytic converter. The one after the catalytic converter is the bank 2 sensor. The sensor heater is located in the sensor can only be replaced as a whole. You should be able to change this yourself with the correct size wrench... just unplug sensor, loosen and remove. Replace with new sensor the same as removed. This could be causing the egr system fault as well.

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