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YouTubeThe 2-Minute Mechanic™
How to Test and Swap an O2 Sensor Fast
An oxygen sensor is tested by measuring heater circuit resistance with a multimeter and swapped using a 7/8 inch socket. This restores fuel efficiency instantly. A faulty O2 sensor causes rough idling, poor fuel economy, and triggers a check engine light. In this quick guide, we cover the exact multimeter settings required to verify a dead ...
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