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Is the check engine light ON , Any malfunction codes .
How high does the temp gauge get ..Alway low at the cold end .
would your scan tool not communicate with the system .
Should have the OBD being a 1999 model.
But if you replaced the MAF and that was the problem then the light will go out automatically when the ECM is cleared by disconnecting the battery .
If the light comes back on then there is still a problem in the management system .
Which wire was cut ? on the O2 sensor .