Thanks Iain, the O2 sensor is running at 0.95V or thereabouts as the engine is cycled. I’m trying to find out what things change, or thresholds are breached, to get that Okay to not Okay displayed on the diagnostics. MEMS3 lookis to have some additional/different parameters. Good luck with your quest too to get emissions more reasonable.
Hi, newbie to the forum and I am trying to investigate why my Elise is running rich, it has MEMS 1.9. I get Oxygen Sensor Status Okay for approximately 5 minutes then it switches to Not Okay. Does anyone know what parameters change to trigger the okay to not okay status on the diagnostic tool?