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jeepmopar76
jeepmopar76, Dodge/Chrysler Triple Master Tech
Category: Dodge
Satisfied Customers: 2144
Experience:  32 yr ASE Master Tech,9 yr Chrysler Master Tech, 13 years Dodge dealership service
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2003 dodge ram 1500: many o2 sensors..my truck..5.7 hemi

Customer Question

how many o2 sensors does my truck have 2003 dodge ram 1500XXXXX5.7 hemi
Submitted: 7 years ago.
Category: Dodge
Expert:  jeepmopar76 replied 7 years ago.
Here is the description, right out of Chrysler's web site; your emission sticker under the hood, will say if it is Fed. or Cal.

DESCRIPTION

The Oxygen Sensors (O2S) 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 1/1 and 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emission package, the right upstream sensor (2/1) is located in the right exhaust downpipe just before the mini-catalytic convertor. The left upstream sensor (1/1) 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.