1999 chevy tahoe

[davelaclair]

How do I get the monitors to go off, 1 O2 sensor2,cat,3evap.need them off to pass insp.

THANKYOU
DAVE

 

[SunlitComet]

usually within 10-20 miles of varied driving does it. how long have they not been green?

 

[wrager]

I recently went through this with my daughter's Equinox. Had to replace the battery and then pass smog testing here in ATL. You can google "OBDII drive cycle" and find the process. It was almost 800 miles before our monitors would be in "ready" mode.