Your Chevy S10 may fall into a category of S10 Flex Fuel models which have known OBD-II monitor readiness issues. The OIS emission device however should be tuned to detect the Chevy S10 as having known issues and ignore Emission Monitor readiness requirements... Your S10 should technically pass the smog inspection.
You may consider attempting the smog test a second time, maybe at another smog station with different OIS equipment, or visiting the smog check referee's office. You may contact the state smog check referee by calling (800) 622-7733.
Known Monitor Compatibility Issues
Chevrolet 2000-2002 S-10 (2WD), 2.2L I-4 (E85)
Certain flex fuel models with the vehicle identification numbers (VINs) listed below may have trouble making emission monitors ready.
YGMXT02.2121
YGMXT02.2122
1GMXT02.2122
2GMXT02.2122
YGMXT02.2121
YGMXT02.2122
(VIN 8th digit: 5)
