Oxygen sensors measure the amount of oxygen present in exhaust gases. The sensors continuously send this information in the form a voltage to the Powertrain Control Module. This information is used by the Control Module, in conjunction with other data sent by sensors, to regulate fuel injection into the engine. The PCM will also need to receive constant voltage signals from the sensor. The PCM will store the P0133 error code in memory if the oxygen sensor does not respond quickly to changes in the air-fuel ratio as you accelerate. The cylinder 1 side of the engine is referred to as ‘Bank 1’, while the oxygen sensor upstream located before the catalyst converter is referred to as ‘Sensor 1″.
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What are the possible causes of fault code P0133?
- Faulty Oxygen Sensor
- Leaking Exhaust Manifold
- Engine vacuum leaks
- Open or short circuits in the O2 sensors cables
- Build-up of carbon or oil on the O2 Sensor (a large build-up can clog the ports that the sensor uses to determine the air/fuel ratio)
- A dirty mass airflow (MAF)
- Incorrect fuel pressure
What are the symptoms of fault code P0133?
- The engine is misfiring, or the engine stalls.
- A rich or lean engine
- Fuel consumption increases
- Engine losing power
- Increased emissions values
- Smoke from exhaust
How to Fix Fault Code P0133?
- Replace faulty oxygen sensors
- Repair damaged cables and loose connectors in the oxygen sensor circuit
- Repair vacuum leaks
- Repair leaks in exhaust systems
- Cleaning dirty mass airflow sensor
- Cleaning O2 sensor cable and terminals
How serious is fault code P0133?
The vehicle will not stop running if the fault code is P0133, but you should fix it as soon as you can. This code indicates that exhaust gas pollution, which is extremely harmful to the environment, has occurred. This code may also indicate a decrease in power and engine performance.
