tugboat95 Posted August 2, 2021 Share Posted August 2, 2021 So this popped up today while driving to work this morning. Went off by the time I got there but lit up and stayed for the drive home. I haven't lifted the hood yet, truck drives fine. 112k miles on original engine and exhaust is all original. Redid head gasket and new Bosch injectors 6 months ago. What's the most common causes off this light? Vacuum line somewhere, O2 sensor, clogged catalytic converter? Who do I need to look at? 89 Renix 6 cylinder with 5 speedanual. 89 ComancheEliminator2wd4.0L5 speed PukeGoatFactory Original Link to comment Share on other sites More sharing options...
fiatslug87 Posted August 2, 2021 Share Posted August 2, 2021 It's just a light that triggers at certain mileage (80k???) to change the O2 sensor but does not mean anything is wrong. I recall a write-up on resetting it but most people just remove the little control box. Link to comment Share on other sites More sharing options...
Eagle Posted August 2, 2021 Share Posted August 2, 2021 It's nothing but a mechanical timer. There are no sensors that trigger it -- it's a reminder to replace the O2 sensor. Link to comment Share on other sites More sharing options...
tugboat95 Posted August 3, 2021 Author Share Posted August 3, 2021 I can live with that. Maybe I'll change them...one of these days.89 ComancheEliminator2wd4.0L5 speed PukeGoatFactory Original Link to comment Share on other sites More sharing options...
Pete M Posted August 3, 2021 Share Posted August 3, 2021 if you unplug the box, the light will go off. it's a clearish little box with a bunch of gears in it under the dash on the drivers side. Link to comment Share on other sites More sharing options...
GrizzzzBear Posted August 7, 2021 Share Posted August 7, 2021 I have the same Issue. What Box & Where is it?? Link to comment Share on other sites More sharing options...
fiatslug87 Posted August 7, 2021 Share Posted August 7, 2021 Under driver side dash. Emission timer: Link to comment Share on other sites More sharing options...
fiatslug87 Posted August 7, 2021 Share Posted August 7, 2021 Here's the write up on resetting if you want to go that route. https://nickintimedesign.com/renix-emission-timer-teardown/ Link to comment Share on other sites More sharing options...
tugboat95 Posted August 7, 2021 Author Share Posted August 7, 2021 I've seen that box under there. And wondered what it was. I'm going let everything ride right now. All projects are on hold til I get my garage built. Maybe by spring I can rip drive train out and send the body off to be painted. Then put it back together piece by piece. I want to Stroke it but my end vision is factory original. But I've already converted to an open cooling system. 89 ComancheEliminator2wd4.0L5 speed PukeGoatFactory Original Link to comment Share on other sites More sharing options...
GrizzzzBear Posted August 13, 2021 Share Posted August 13, 2021 On 8/7/2021 at 11:11 AM, fiatslug87 said: Under driver side dash. Emission timer: Thank You. I really appreciate the pic. Link to comment Share on other sites More sharing options...
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