Review on Denso 234 4066 Oxygen Sensor by Jordan Rini

Check engine light on my (100,000+ miles) 2000 Saturn SL. I went to O'Reilly Autoparts and borrowed their diagnostic tool (saved money by not taking it to the shop) and it showed the front oxygen sensor was bad. I bought the front and rear sensors as the rear one will probably fail soon. Front changed as it was easy. I asked a mechanic to replace the rear end (right after the catalytic converter) as it had a shield welded on it that was difficult to remove and I didn't have the tools. All is good now, 100,000 more miles, and the parts were about half the price.