Where is the oxygen sensor located on a 2000 astro van?
They are located in the exhaust system, rearward of the manifolds, and again after the catalytic converter.
It is located on the muffler by the moter and looks like a sparkplug with wire attached at the end. To be specific, my 2000 Durango has 1 upstream oxygen sensor and 1 downstream oxygen sensor. Both are located on the exhaust pipe. The upstream is between the engine and catalytic converter. The downstream is located between the catalytic converter and muffler. - Mick