Review on 🚗 Enhance Your Vehicle's Performance with the Delphi ES20000 Oxygen Sensor by Mark Walsh

I bought everything for oxygen sensors for my 454 Chevy engine in my RV. think Delphi is a quality brand. The two front ones were fine. The rear two post cat sensors were getting hot and seemed fine, showing 0.45 volts on the scan tool. never changed, i spent hours looking for a short or melted wire but nothing was found, after starting the car for about 15 minutes i started sending pending code PO140 and PO160 inactive sensors. I had them installed, figured I would have to reset the PCM to clear the codes. the same results. After two weeks of trying different things, I finally went to the Autozone and bought a new Bosch. Immediately began to create a schedule. replaced by others with excellent results. So be careful, these delphis cannot be tested before sale.