my check engine light came on and its staying on whats the problem? not blinking
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i remember that it came on a couple of months ago for awhile and i remember filling up one day with regular gas and it went off, but now its back on. i had a cat put on a few years ago. i hope thats not the problem.could it be the rear 02 sensor.
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i used a hand held dianogstic machine and the code that came up was PO420