Upper bank 02 sensor,replaced. still check engine light on. Changed thermostat. still check engine light on
Ok ,so you have OBD2 car,in the USA.
canada went OBD2 in 1998, so this is usa car.
and found out all scan tools work on it. yup.'
but then failed to post the DTC errors. you have.
why not tell that first. ?
each can be driving off but will take, hours
or will take many driving cycles .
The GEO Prism or the Toyota, Corolla (same car)
BOTH service manuals covers this.
the lamp will not go off , if the true problem is not cured. (by Design and federal laws of the USA)'
why not post the symptoms and DTC errors and ask for help.
now how to clear DTCs. (all ways from Sunday)_
1: fix the problem.
2: then there are 4 ways to reset stored DTC errors (in memory ) not live errors.
you can not delete live errors,
well, you might for seconds... the bam,its back.
live.
a: pull the ecu memory fuse (ask) for 5min.
b: push reset DTC on the scan tool(a button)
c: pull the battery, for 5min.
d: drive them off as the service manual tell you,nah.
this only deletes stored errors from OBD2 memory.
(EEPROM)
why not post the symptoms first?
and the real DTC'S stored.
you can not fix cars guessing nor, pushing buttons.
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