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Mitsubishi Check Engine Light

Q. 1990 Mitsubishi Mighty Max 2.4 liter recent rebuild, new head gasket, manual transmission, 113,000 Miles, EFI, no ABS, P/S and Air, no cruise. Heres my question, the check engine light comes on and stays on but there seems to be no running problems. Heck I had the truck up to 105 mph!!!

I took the battery cable off to reset the computer but it still came back on. I checked over the engine to look for loose wires but I found nothing. I figure it might be the oxygen sensor but I really have no idea. Can you help me?

A. I guess the first thing I would do is pull the codes from the computer. If the Check Engine Light (MIL) came on, the computer stored a code. Even if the MIL goes out, the code will remain stored in the computer.

You can get instructions on how to access the codes here: Trouble Shooting.

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