The O2 sensor is responsible for measuring the amount of oxygen in the exhaust gas, which helps the engine control unit (ECU) determine the air-to-fuel ratio and make necessary adjustments to maintain optimal performance and emissions control.
When the ECU detects a problem with the O2 sensor, it turns on the check engine light and stores the P0135 code in the vehicle's computer system.
Here are some possible causes for the P0135 code:
- Faulty O2 sensor
- Damaged O2 sensor wiring or connector
- Insufficient voltage to the O2 sensor
- Air leak in the exhaust system
- Faulty fuel injector
- Faulty mass air flow sensor (MAF sensor)
- Faulty ECU
If you see the P0135 code on your vehicle's dashboard, it is recommended that you have the vehicle inspected and diagnosed by a qualified mechanic to determine the exact cause of the issue and perform the necessary repairs.
Here are some additional notes and things to keep in mind:
- O2 sensors are typically replaced as part of routine maintenance around every 100,000 miles.
- It is important to use the correct O2 sensor for your vehicle's make and model, as different types of O2 sensors may have different characteristics and wiring configurations.
- Before replacing the O2 sensor, it is a good idea to check the wiring and connector to make sure there is no damage or loose connections.
- An oxygen sensor code reader can be a useful tool for diagnosing the specific problem with the oxygen sensor.
- It is important to address and resolve the underlying issue causing the P0135 code, as it can affect fuel economy, emissions, and the vehicle's overall performance.
