flacopower Posted March 7, 2015 Share Posted March 7, 2015 1993 Supra with 40k miles running rich (can smell excess fuel after WOT run). I've seen contradictory information add to what the acceptable range of voltage is on the diagnostic port. Below is a video of my reading of a warmed up car. Quote Link to comment Share on other sites More sharing options...
mellonman Posted March 8, 2015 Share Posted March 8, 2015 (edited) http://www.mkivsupra.net/vbb/showthread.php?35940-Narrowband-O2-Sensor&highlight=oxygen So looking at your video your reading are dropping way down into 0.15 which is out of tolerance 0.35 is about the limit mate, Time for a new o2 sensor by the looks of it Edited March 8, 2015 by mellonman (see edit history) Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 8, 2015 Share Posted March 8, 2015 If its a cold start then the O2 feedback is not used, and will still be warming up the sensor, until the engine is warm, if the O2 sensor is fooked then it will usually stil stick at a low voltage so the ECU runs things rich for safety. Quote Link to comment Share on other sites More sharing options...
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