Tires do not have oxygen sensors. They can have pressure sensors. The lack of pressure sensors would have no affect on fuel economy.
All of the engine sensors can affect fuel mileage.
yes
If this vehicle has high mileage I would start with the plug\wires and oxygen sensors. These would all affect fuel mileage on higher mileage vehicles. Hope this helps you.
Yes. Your engine will get the best mileage at full operating temperature. If the thermostat is removed or not working properly causing the engine to become too hot or not hot enough it will affect the operating efficiency or your engine which will decrease your gas mileage.
Absolutely. Not just on Subaru but every car built that has an oxygen sensor. And they all do.
First, your car gets the best gas mileage with properly inflated tires. That means less pollution produced and less gasoline consumed. Second, tires wear out faster when under or over inflated. Making tires costs many different resources and adds pollution to the environment. Disposing of old tires also adds pollutants to the environment. Finally, if your tires are not properly inflated you are more likely to get into an accident due to inefficient braking and steering. If you get in an accident resources will have to be used to help you and others. Your car may also leak pollutants such as gasoline, antifreeze, and oil if it is involved in an accident.
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any of the oxygen sensors could affect gas mileage but usually the first one in the exhaust pipe on either side causes the most driveabilty issues.
Yes, it can affect the oxygen sensors and catalytic converter.Yes, it can affect the oxygen sensors and catalytic converter.
Under inflated tires will affect any car's performance and thus be a safety hazard as well as a cost to the owner in the way of lower fuel mileage and additional wear on the tires. The fuel mileage on under inflated tires I would say is about 1-5mpg reduction. However, that's not the biggest concern. On an AWD vehicle you want all tires to have the same amount of wear as well as proper inflation to prevent any damage to the differential and computer. Driving short distances with under inflated tires wont hurt the vehicle but it would not be something I would recommend long term.
If your tires are under inflated the resulting "resistance" created will lower your gas mileage. However, if you maintain the correct pressure in your tires it reduces the resistance and improves your car's efficiency. It's also safer.
If it is malfunctioning it can affect fuel mileage.