SOURCE: location of O2 sensor in maruti wagon r car 2007 model
the o2 sensors. there are a few sensors all depending on what size engine you have, there may be 2 or 4. the sensors are located in the exhaust system , they are screwed into exhaust pipes or the exhaust manifold, the way it works is the sensors are used to read exhaust readings, the cat-converter which cleans the exhaust has a sensor before it and after it.
look at the exhaust system, start at engine manifold and follow it down to muffler and as you follow it you will see sensors,
Here is a picture to help you locate them. good day.
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