Review on 🔋 Denso 234 4668 Oxygen Sensor: Reliable Performance for Optimal Fuel Efficiency by Tony Watts

Original Equipment Front O2 Sensors Slow At 120,000 Miles. In the last few thousand miles the car became sluggish, with poor idling, occasional bursts of part throttle and poor gas mileage. With these problems, the Check Engine lights never came on. Fuel pressure was excellent. First I cleaned the MAF. Only minor assistance to solve handling problems is described. Installed these front oxygen sensors. The improvement came immediately. After installing two new front sensors, the car behaved completely differently. Instead of sampling up to 10 times per second, they slow down significantly - in some cases sampling as little as once per second or even slower. For a modern fuel injected engine, this time is like an eternity spent waiting for new data from the O2 sensors so the ECM can adjust the mixture accordingly. The big question is also whether the data from the old sensors were still correct after delivery. Each installation took less than 15 minutes with the front of the car on the ramps. Both front sensors were easily accessible from below.