Oxygen Sensor Replacement
What is an oxygen sensor?
The oxygen sensor, sometimes called an O2 sensor, is a device mounted in the exhaust system that constantly monitors the oxygen content in the gases that exit the engine.
Oxygen sensors are located before and after the catalytic converter. A vehicle may have two to five oxygen sensors, and sometimes even more.
How does the oxygen sensor work?
The information from the oxygen sensor is used by the engine's computer to help determine how much fuel is needed so that the engine will run efficiently. The sensor sends this information by producing voltage when the sensor is heated. The voltage rises and falls as oxygen levels in the exhaust rise and fall.
What are the symptoms related to a bad oxygen sensor?
A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.
Can I drive with a oxygen sensor problem?
A vehicle that has a bad oxygen sensor can be driven safely until the sensor can be replaced. But the car will not run as well until the repair is made.
Oxygen sensors can fail if they are contaminated with oil, coolant or silicone. If fluid contamination has caused an oxygen sensor to fail, the leak must be fixed or the new sensor may be ruined too.