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Once the oxygen sensor fails, the computer drops back to a much less efficient mode of operation. Running with a failed Oxygen sensor, you'll use more fuel and if your state/city requires an emissions test, the vehicle will fail.

Oxygen sensors come in many varieties, and if the heater fails on a heated oxygen sensor it will not function properly.

Yes, Oxygen sensors are expensive. But recognize that by converting to computer controls you now have an engine that needs tune-ups MUCH less frequently. Routinely take care of the components as they fail and as a general rule, the engine will not only last longer, you'll get better fuel economy.

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Q: What is th Affects of a bad heated oxygen sensor bank1 sensor1?
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