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? for Mechanics

I have a 05 Chevy Z71.
How much will it affect the fuel milage if the oxigen sensor heater goes out? I have 4 of the sensors in my truck and only 1 is bad.I plan on fixing it, but you replace all or just the one that is bad?

I have 125,000 on it also.

Thanks.

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256-436-0014 Cell

It should run ok until you can replace it and I would only replace the one thats bad. The engine cintroller will run on the default settings rather than fine tuning the engine as it works.

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Bill Harper
Washington, NC
252-944-5592

gas cap

make sure your gas cap is tight !!!!

The gas cap is what the guy checked first.LOL.

Thanks.

__________________
256-436-0014 Cell