Bought for my 01 4Runner 4WD. After driving 295,000 miles I came across CEL codes. I swapped the upflow and downflow sensors 02. The problem did not recur. You will need a good 22mm box wrench or a deep wrench with a broken rod. Depending on driving conditions, this knot can get quite tight. I was able to use an allen wrench and a PB blaster to take it off. Along with that sensor, they deliver some anti-size copper. USE IT! The job was pretty easy once the sensor was detached.
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