P1133 ISUZU – H02S Insufficient Switching Bank 1 Sensor 1

P1133 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1133 ISUZU Possible Causes

Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1,Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted,Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical conection,Air leak in exhaust near O2 sensor

P1133 ISUZU Description

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.