If it's a V-6 engine it will have 2.
There is 2, one before and one after thecatalytic converter.
All O2 sensors are located on the exhaust system. Start at the exhaust manifold and work your way backward, and count them.
Only one
It has four oxygen sensors.
The Jetta has two oxygen sensors.
The 2012 Chevrolet Malibu has 16 valves.
Assuming you mean O2 sensors, the 2004 Chevrolet Malibu with the 2.2L engine has two O2 sensors, one upstream (before the cat) and one down stream (after the cat).
The 4 cylinder models have two oxygen sensors, and the V6 models have four oxygen sensors.
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There are approximately 2 oxygen sensors on a 2005 Chevrolet Astro van. The oxygen sensors can be purchased at stores such as NAPA.