Question about 2002 Mitsubishi Galant

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P0421 for 2003 eclipse - 2002 Mitsubishi Galant

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This is usually caused when someone either gutts their cat or uses a test pipe..causes the secondary o2 to read high..cheap fix is to buy a set of spark plug anti foulers. You drill out one enough to where you can screw the o2 sensor into it then screw the drilled one into the undrilled one then screw the combo back into the o2 bung and reset the ecu by unplugging the ecu or just remove the negative bat post for 10sec with one door open.this will stop the code unless your o2 sensor is bad but the secondary usually dont go bad P0421 for 2003 eclipse - 1b62c4e1-507d-45ee-97ef-b254330bfec4.jpeg

Posted on Feb 14, 2014

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Posted on Jan 02, 2017

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