P1138 ISUZU HO2S 2 Voltage Stays High Rich Condition

Possible causes

– Leaking injector or regulator
– Engine ignition misfire
– Engine mechanical condition
– Faulty HO2S
– HO2S Sensor 2 harness is open or shorted
– HO2S Sensor 2 circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)