CODES 172 AND 653

1995 Ford Probe

Transmission problem
1995 Ford Probe 4 cyl Front Wheel Drive Automatic 133, 00 miles

I am geting two codes 172, 653 but the car runs great and shifts good I just replaced the spark plugs thay were bad and reset the computer could it be possable that I have a bad o2 sensor and transmission control switch and how hard is it ot change the switch?
August 15, 2010.

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