Japanese Subaru Oxygen Sensor

Description

Warning Signs of a Failing O2 Sensor

O2 sensors don’t require regular maintenance like air filters or oil filters, but over time they can start to wear out. A failing oxygen sensor could lead to the ECU being unable to regulate the proper air-to-fuel ratio, which can cause engine performance issues.

Here are some possible indicators of O2 sensor wear and tear:

• Decreased gas mileage: A failing oxygen sensor could cause an increased amount of fuel injected into the engine, resulting in significantly lowered fuel economy.
• Engine misfiring: Rough idling and engine misfiring are common signs that an O2 sensor is failing. Combined with a check engine light, this can be an indicator that you need to have the part checked.
• Drop in engine power: An air/fuel mixture that isn’t regulated properly can cause performance issues with the engine, including difficulty accelerating or reaching full power. This can be caused by a worn O2 sensor.
• Rotten egg smell: Excess fuel in the engine can produce the smell of rotten eggs that comes from sulfur. Excess fuel could be due to a failing O2 sensor.

If you notice these symptoms or that your check engine light has come on, it’s important to take your vehicle to get looked at by a trained technician, who can determine the source of the problem.