O2 sensor replacement-one or both?

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Jun 24, 2004 | 03:20 PM

MarkFahey

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From: Morris, Illinois

O2 sensor replacement-one or both?

Does the rear one go bad over time like the front one or is it pretty much good for the life of the car?

Jun 24, 2004 | 03:30 PM

Rogue

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From: Westerville, Ohio 2000 Black SSEi

The only thing the rear one does is tell you the cat is working. Dont bother replacing it until you get a code about it. It does nothing for your performance or mpg or anything like that.

Jun 24, 2004 | 08:28 PM

PontiacDad

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From: Purgatory

The front one is enough as Rogue stated. You can get a rear O2 spoof which is much cheaper than an actual sensor, also needed when going to a high flow cat.