Does the oxygen sensor make check engine light come on?

Yes, an oxygen sensor can cause the check engine light to come on. The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gas and sending that information to the engine control unit (ECU). The ECU then uses this information to adjust the air-fuel mixture to maintain the proper combustion ratio. If the oxygen sensor is not working properly, the ECU will not be able to accurately adjust the air-fuel mixture, which can cause the check engine light to come on.

There are a few things that can cause an oxygen sensor to fail, including:

* Normal wear and tear: Oxygen sensors typically have a lifespan of 100,000 miles or so. After that, they can start to degrade and fail.

* Exposure to extreme heat: Oxygen sensors are exposed to very high temperatures in the exhaust system. If the sensor is exposed to too much heat, it can damage the sensor and cause it to fail.

* Contamination: Oxygen sensors can be contaminated by a variety of things, such as oil, coolant, and dirt. This contamination can interfere with the sensor's ability to accurately measure the oxygen content of the exhaust gas.

If you see the check engine light come on, it's important to have your vehicle inspected by a qualified mechanic. They will be able to diagnose the problem and determine if the oxygen sensor is the cause. If the oxygen sensor is the cause, the mechanic will replace it and reset the check engine light.