Four Telltale Signs of a Faulty Subaru Impreza Oxygen Sensor
Your Subaru Impreza oxygen sensor is responsible for sending out signals that help your car produce the perfect air to fuel ratio for optimum engine performance. However, with regular exposure to heat, vibration, and other elements, your oxygen sensor will eventually wear out. A worn-out O2 sensor does not only cause several performance problems for your car; it can cause other vital components in your system to fail as well. Here are some symptoms of a faulty oxygen sensor:
Check engine light on
Possibly the biggest clue that you have a bad oxygen sensor in your Impreza is an illuminated check engine light. The lighting up of the check engine light alone won't tell you exactly what's wrong with your vehicle, so you will have to perform a couple more steps to verify that your oxygen sensor has gone bad. You can bring in your car to a local auto parts store or a nearby mechanic and have them read the code thrown out by your computer. However, investing in an OBD II code reader and doing the diagnosis yourself is much more cost-efficient in the long run.
Reduced fuel economy
You can usually tell that your oxygen sensor is starting to get too worn out when your miles per gallon start dropping. You get the best fuel mileage when your car runs on the perfect air-fuel mixture. Since slow or wrong signals from a defective oxygen sensor can mess up the ratio of air to fuel, your fuel economy will definitely take a hit.
Poor engine performance
In its worst state, a damaged oxygen sensor can cause your car to suffer from idling problems, engine misfires, and a generally weak performance from your engine. If you start experiencing a rough idle or a stuttering engine and all the other components of your engine, electrical, and exhaust systems are in good condition, then your oxygen sensors are probably due for a replacement.
Since your oxygen sensor works closely with your catalytic converter to control your car's emissions, a defective O2 sensor will naturally result to more harmful emissions from your vehicle. A failed emissions test will tell you that you have to replace either your catalytic converter, oxygen sensor, or both.