* O2 Sensor Function: The oxygen sensor (O2 sensor) monitors the exhaust gases for oxygen levels. This information is used by the engine control unit (ECU) to adjust the fuel-air mixture for optimal combustion.
* Bad O2 Sensor Impact: A bad O2 sensor can cause:
* Poor fuel economy: The ECU won't be able to adjust the fuel-air mixture correctly, leading to wasted fuel.
* Rough idle and stalling: The engine may have trouble running smoothly, especially at idle.
* Increased emissions: The engine will run richer than optimal, leading to higher emissions.
* Check Engine Light: A bad O2 sensor will usually trigger the check engine light.
* Still Running: The engine will likely still run, even with a faulty O2 sensor, because the ECU has a "default" fuel-air mixture setting. However, it won't be as efficient or clean-burning as it could be.
So, while the car might run, it's important to address a bad O2 sensor issue. This will help improve fuel economy, reduce emissions, and make the engine run more smoothly.
