The oxygen sensor is a key component of the system. Oxygen sensors adjust the air fuel ratio in an engine. Oxygen sensors send a specific voltage to the ECM (electronic control module). There are several other sensors that also send signals to the ECM Tuning. All of these sensors control the emission control system of a vehicle. The ECM uses all of the information together to trim the air fuel ratio.
What Oxygen sensors do?
Oxygen sensors came out first time in the 1980s. Old oxygen sensors were quite simple as they had just one wire which transmitted the voltage. Later versions had three wires and had their own heaters and so they were called heated. The Old oxygen sensors versions usually last about 50,000 miles and the modern oxygen sensors last about 100,000 miles. If the oxygen sensor fails your car will still run, but it will run inefficiently usage as well as exhaust emissions. Bad oxygen sensor can cause as much as a 20% drop in fuel mileage.
In Most vehicles if the oxygen sensor fails, your engine light comes on. I suggest that anytime you have your car tuned up make sure to have the oxygen sensor tested. In newer cars you can plug into the ECM and get a report on the condition of the oxygen sensor.
I like to suggest you that don’t buy the cheapest part offered in the market. There are some sensors that will appear and work good at the start then, fail after 5000 to 10000 miles. Always use the products of good companies because that are backed with a good warranty.
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