Review on 🔍 Denso 2344261 O2 Sensor by Nick Walker

I have a 2002 4runner code P0420. The Check Engine, VSC and TRAC OFF lights came on. Both the air/fuel sensor and this O2 sensor and cat were original. I started by just swapping this out thinking I'd do an upstream air/fuel gauge when the light came back on. I replaced this sensor and cleared the codes and they never came back. Didn't have to make a top gauge or a cat! Driven about 7000 km, satisfied. Just remember to spray the old one with penetrating lube every day for a week before attempting to unbolt it from the exhaust pipe.