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Replace 5 car parts for better gas mileage

Oxygen sensor
Oxygen sensor © loflo69/Shutterstock.com

Function: It monitors exhaust flow before and after the catalytic converter, sending the data to the engine computer, which adjusts the fuel injection level. When it is faulty, the data aren't accurate. It's best to replace the sensor on cars with more than 100,000 miles.

DIY difficulty: Moderate.

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