RAM 2500 Truck 2WD V8-5.7L (2008)
Oxygen Sensor Relay: Description and Operation
DESCRIPTION
The Oxygen Sensors (02S) are attached to, and protrude into the vehicle exhaust system Depending on the engine or emission package, the vehicle may
use a total of either 2 or 4 sensors
Federal Emission Packages Two sensors are used: upstream (referred to as 1/1) and downstream (referred to as 1/2) With this emission package, the
upstream sensor (1/1) is located just before the main catalytic convertor The downstream sensor (1/2) is located just after the main catalytic convertor
California Emission Packages: On this emissions package, 4 sensors are used: 2 upstream (referred to as ill and 2/1) and 2 downstream (referred to as
1/2 and 2/2) With this emission pack-age, the right upstream sensor (2/i) is located in the right exhaust downpipe just before the mini-catalytic
convertor The left upstream sensor (1/i) is located in the left exhaust downpipe just before the mini-catalytic convertor The right downstream sensor
(2/2) is located in the right exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor The left downstream sensor
(1/2) is located in the left exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor
