The most likely cause of your code is a bad rear knock sensor. You should check the knock sensor wiring harness for corrosion. But if that checks out the sensor will have to be replaced. The knock sensor is under the intake manifold, although it's not too difficult to remove. Both knock sensors should be replaced along with the wiring harness, just because of labor involved in gaining access to the sensors. You could try clearing the code, it may stay off for a long time.
HO2S-22 (Bank 2 Sensor 2) Heater Circuit Malfunction
Possible Causes:
HO2S heater low control circuit is open or shorted to groundHO2S heater circuit is open or it is shorted to groundHO2S heater power circuit is open (test O2A fuse in fuse block)HO2S heater element is damaged or has failedPCM has failed.
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