GMC Sierra

Where are the o2 sensors on 98 sierra 57?

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2006-07-25 17:26:51
2006-07-25 17:26:51

I have a '96 Sierra 1500 Z71 5.7L, and the O2 sensors are located on the exhaust manifolds (headers) near the end where the exhaust bolts on. Im not positive, but I think there might also be 1 or 2 more sensors on the exhaust just in front of the catalytic converter or just after it. But, all you have to do is crawl under the back of the truck and look along the exhaust and you can see where they are bolted to the side of the exhaust. When changing them I would recommend spraying them with some rust penetrating lubricant and letting them sit for a couple minutes before trying to take them off. Exhaust bolts are notorious for being a pain and can break very easily!!! Hope this helps!! Go to a Napa store and they probably can tell you.

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