I have the truck listed above SR5e. The slip indicator light and the check engine light both came on. I did a scan and the code was Bank 1 and P0420 which is Catalyst system is below threshold. I replaced the oxygen sensors and cleared the code. After about 30 miles, the lights came back on. My non-mechanic friend suggested that my engine might be using oil and was fouling the sensors. I thought it might be a logical try. Although there was no smoke and no drop in oil level, I tried some oxygen sensor spacers to get the tips out of direct flow. Didn't work either. The lights still came on. I did another scan and the new sensors seemed to be working and the upstream sensor tested out as 770.0 F and the down stream sensor was 532.3 F on warm up.
Once cleared, both lights come on and remain on after about 30 miles. Any suggestions?
Once cleared, both lights come on and remain on after about 30 miles. Any suggestions?
Aug 23, 2020 at 9:12 AM
