Oxygen sensors upstream and downstream location

Picture in the service manual is a little confusing. Look for a sticker under the hood or by the radiator that shows vacuum hose routing to see if they show that sensor. It is held on in front of the intake manifold by one bolt, (at least that's all they show). There should be no vacuum hose going to it but it will have a three-wire connector with a black / light blue, violet / white, and dark green / red wire.