Low gas milege is an indication of a bad oxygen sensor and/or it's wiring. A lack of power, increasing vibration in car's floor and cabin area(s), high RPM's at highway speeds.
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Check engine light would appear.
The check engine light will illuminate with a code(s) directing which O2 sensor is bad.
When the oxygen sensor goes bad, the check engine light goes on.
banging into gear
When an oxygen sensor goes bad a car will burn gas at a higher than normal rate because it will not be producing as much power as before. The oxygen sensor checks the amount of exhaust.
It's simple. The engine will work on a much higher RPM or it will shut down itself without giving you any other signs.
An auto xray scanner can determine if a O2 sensor is bad.
It sure can.
When you have a bad oxygen sensor your car may consume a lot of gas. Your car may also drive slower.
There really isn't any way to test the oxygen sensor to see if it is good or bad. If your check engine light is on you can take it to Autozone and they will hook it up to computer and if the oxygen sensor is bad, the computer will detect it.
the check engine light will come on