o2 sensors

Asked by Aug 05, 2016 at 09:46 PM about the 2003 Chevrolet Blazer

Question type: Maintenance & Repair

How many o2 sensors do my 03 blazer have and
where are they located?

1 Answer


There are 3 O2 sensors on the '03' Chevy Blazer. 2 upstream of the CAT and 1 downstream of the CAT (Which is the easiest to find). The two upstream are the "bank 1" (driver side) and "bank 2" (passenger side) Sensors. They are a little more difficult to locate but if you trace the exhaust manifolds off each side of the engine, you will see them tucked up in there between the wheel well.

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