When it is red, it indicates that the oxygen sensor is not functioning properly. The oxygen sensor is responsible for monitoring the amount of oxygen in the exhaust gas and sending this information to the engine control unit (ECU). The ECU then uses this information to adjust the air-fuel mixture accordingly.
If the oxygen sensor is not functioning properly, the ECU will not be able to adjust the air-fuel mixture correctly, which can lead to a number of problems, including:
* Poor fuel economy
* Reduced performance
* Increased emissions
* Engine damage
If the OXS light is red, it is important to have the oxygen sensor checked and replaced if necessary.
