How many O2 sensors on a 99 1500?
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Veteran
Joined: May 2011
Posts: 267
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How many O2 sensors on a 99 1500?
5.9L.
I need a new Upstream (pre-cat) O2 sensor. I went to my local parts store and they told me my Truck has 3 sensors....One Post-cat, and 2 pre-cat...One on both side of the manifold or something?
When I go under the truck all I see is one directly in front of the Cat and one directly after it....
Help?
I need a new Upstream (pre-cat) O2 sensor. I went to my local parts store and they told me my Truck has 3 sensors....One Post-cat, and 2 pre-cat...One on both side of the manifold or something?
When I go under the truck all I see is one directly in front of the Cat and one directly after it....
Help?
Administrator
Joined: Apr 2010
Posts: 87,480
Likes: 4,223
From: Clayton MI
Unless you have california emissions, you only have the two you found. Make sure the new one has the same style connector as the one currently on your truck. Do NOT buy bosch sensors, get the Denso, or NTK fellers.