Hello everyone,

I'm new to the forum and I've encountered a problem with my new to me RX. It's a 2017 with 1500 miles. I'm getting a rear O2 system fault. It's only showing up when I come to a stop after some steady running on back roads or highway. It hasn't popped up while I'm moving yet. My first instinct is to just replace the sensor but I want to get some feedback from the forum first. I did a search but none of the threads I found on the subject listed a solution.

It's a stock 1190 with stock ECU. It has a 44 tooth sprocket.

Thanks in advance,

Paul