Originally Posted by 89Cherokee
i figued it didn't have one I just needed to check!
How do i get that light to turn off... can i get a replacement timer from somewhere?
Pull the timer. That will usually turn the lamp off.
The EMISS MAINT timer isn't connected to anything electronic, and doesn't indicate a fault. It just lights up at intervals to let you know that some components (particularly the HEGO) have met their "specified service life" and should
be replaced. SSL for a HEGO is 60-80Kmiles, although I've seen them run 150Kmiles without any trouble.
You can usually spot a HEGO failure on RENIX by the fact that your fuel economy drops slightly, and there's no other identifiable cause (there's no real way to actually test a RENIX HEGO - it's a non-standard type. The test given in the FSM merely checks the heating element, and not the sensor proper.)
HEGO - Heated Exhaut Gas Oxygen (sensor)
SSL - Specified Service Life