http://en.wikipedia.org/wiki/Renix
Inspection stations
The Renix control system is "pre-OBD," and therefore does
not have a "Check Engine Lamp". It also does not "store" or "throw" Diagnostic Trouble Codes (DTCs) or "Parameter IDs" (PIDs) - see:
OBD-II PIDs.
[5] This is a common problem at
vehicle inspection, particularly in California and other jurisdictions with
emission standards. Most inspection stations are not aware and will try to explain that the CEL/MIL "doesn't work" (note: there may be a cutout for it, but no bulb). It is recommended that the inspection technician be shown the "OBD Exempt" federal emissions label (located under the hood) and/or have the factory service manual as a reference to avoid this problem.