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Q: o2 sensors on 2006 Toyota Tundra

emissions code pop up Poo37
bank 1 sensor 2
replaced it with a bosch
check engine light pops up right away
changed the sensor after the cat - towards back of truck
any help?
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Get a wiring diagram and a voltmeter, find the wire that provides power to the sensor heater and check for 12 volts when the engine is running.
Find a manual with wiring diagram here:
As I always say, diagnose first, then replace. You may have wasted money on a sensor when it was a blown fuse or a loose connection.
Good luck.
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