Charge the a/c with refrigerant. But being a '92, it will need to be converted to R134a, provided your compressor is good (prolly not) it would cost around $300,
The check engine light on a Buick Regal can be reset with a special diagnostic scanner. This can be performed at a car dealership or service garage.
You can only reset it with an OBDII diagnostic scaner
with hand held computer (scanner)
how do you reset check engine light in 2008 buick lucerne
Figure out what tripped the code and fix the problem
Disconnect the negative battery cable for 10 seconds.
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