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Oxygen Sensor

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Engine warning light has come on which showed a P0420 error code


Placed this on a OBD scanner which gave the following results.  Taken from a coldish engine:


Oxygen sensor 1 Bank 1 Voltage - 0.16V

Oxygen sensor 1 Bank 1 Short term fuel trim - 3.13%

Oxygen sensor 2 Bank 1 Voltage - 0.48V

Oxygen sensor 2 Bank 1 Short term fuel trim - n/a%


The "n/a%" never changes as I rev the engine, where as the other values do fluctuate

Is this normal - or does it appear that one of the sensors has stopped working

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