P1139 Isuzu HO2S Insufficient Switching Bank 1 Sensor 2

P1139 Isuzu HO2S Insufficient Switching Bank 1 Sensor 2

Possible causes
– Faulty HO2S Bank 1 Sensor 2
– HO2S Bank 1 Sensor 2 harness is open or shorted
– HO2S Bank 1 Sensor 2 circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
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