What are the possible causes of P1133 code?
What are the possible causes of P1133 code? P1133 Possible Causes. Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1. Vacuum leak. Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted. Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection. What does trouble code p0133 on oxygen sensor mean? This trouble code involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as...