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There is a possibility of up to 4 oxygen sensors on a typical internal combustion engine.
They are typically numbered according to their "bank", meaning which head they sense. Bank 1 is typically the same side as cylinder 1 on the engine.
Sensor 1 is typically the sensor that is at the junction of the manifold and headpipe. Sensor 2 is the sensor that is behind the catalytic converter. Note that sensor 2 seldom fails.
So...
If you are being told that sensor 1 has failed, and it's a 4 cylinder, inline engine, you should examine the oxygen sensor that is at the base of the exhaust manifold, which, by the way, is the most frequent sensor to fail. You should plan to replace THOSE oxygen sensors every 50,000 to 60,000 miles as part of routine maintenance.
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