they could sail upstream and down stream
both. upstream is under the hood, and the downstream is by the catalytic converter.
one upstream and one down stream on in the manifold up stream the one in or behind the converter down stream
2 one in exhaust stream and one after converter! one upstream and one down stream ,doen stream oxygen sensor is in exhaust pipe after the converter. upstream sensor is ahead of converter.
Coordination between upstream relays for a overcurrent fualt on down stream.
a lock is a system that allows ships to travel upstream and down stream
The up stream is closest to engine and down stream is farest from engine
It has both an up and a down stream oxygen sensor.
Three altogether. Two upstream and one down stream.
Upstream
There is one upstream and one downstream.
A down stream receptacle that is connected to the upstream GFCI will be protected. If the downstream receptacle senses a fault the upstream GFCI will trip.