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How long will it take to replace an O2 sensor?

I’m taking my car in for an O2 sensor replacement. They’re saying I should drop the car off for a whole afternoon. But I had an O2 sensor replaced in my last car several years ago and it barely took an hour. How long does it take to replace an O2 sensor? This seems excessive!

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Matt Terzi · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
The actual process of replacing an O2 sensor is fairly straightforward, and most experienced mechanics can get one replaced in about 30 minutes to 1.5 hours, depending on the make and model of the car. A lot of DIY car repair enthusiasts will even take care of this themselves.
Knowing this, it probably seems ridiculous that your mechanic needs a whole afternoon to get it done. But in their defense, they’re likely just trying to keep a fluid schedule, so their customers aren’t just sitting around in the waiting room for ages.
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