P0037 on 2006 Gen 3 Toyota Rav4 - Easy fix

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The P0037 code stands for “Heated Oxygen Sensor (HO2S) Heater Control Circuit Low (Bank 1, Sensor 2),” which means there’s an issue with the heating element of the downstream oxygen (O2) sensor behind the catalytic converter. A faulty O2 sensor and heater control circuit issues are some possible causes of the P0037 code. Some common symptoms of the P0037 include an illuminated Check Engine Light and a failed emissions test.
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