What is a P 1133 code on 2001 Subaru Impreza with 2.2 engine?

P1133 is a trouble code for a 2001 Subaru Impreza with a 2.2 engine. It means that the oxygen sensor is not responding correctly. The oxygen sensor is used to measure the amount of oxygen in the exhaust gas, which is used to determine the air-fuel ratio. When the oxygen sensor is not working correctly, the engine may run rich or lean, which can cause problems with performance and emissions.

There are a few things that can cause the P1133 code, including:

- A faulty oxygen sensor: The oxygen sensor may be damaged or worn out, which can prevent it from sending accurate signals to the engine computer.

- A problem with the wiring: The wiring to the oxygen sensor may be damaged or disconnected, which can prevent the sensor from communicating with the engine computer.

- An air leak: An air leak in the exhaust system can cause the oxygen sensor to read incorrectly, which can trigger the P1133 code.

To diagnose the cause of the P1133 code, you will need to connect a scan tool to the car. The scan tool can be used to read the data from the oxygen sensor and other sensors, which can help to determine the problem. Once the problem has been diagnosed, you can then repair or replace the faulty part.