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There's 2- 02 sensors on 1991 Toyota Truck (2.4L 4 cyl- 22RE) One right before the catalytic converter & a second just after. Both are mid-way down the exhaust pipe just past the cabin on driver side. Need to get 2 different sensors & make sure you replace the correct one in the pre or post catalytic converter locations.
Best to jack up & support the truck when working. Note post-cat sensor has a heat shield on it that makes it difficult to reach the 2nd nut hold the sensor in place. Recommend buying new nuts from the dealer to replace the old ones. Standard 12mm wrench/socket will remove both hold down nuts per sensor. Also recommend buying Denso (OEM) or NGK brand sensors. NGK's are more expensive.
What else can I help you with?
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Yes
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No.
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