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Q: service engine soon light is on on 1999 Land Rover Discovery

noticed the Service Engine Soon light is on two days ago, I took my car to Auto Zone, they check it with computerized divice, he said it gives him a code of P1173, What is that mean? Also, where can I find a reasonable Europian auto service in my area?
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Possible causes by suggested order of priority:

Deteriorated upstream oxygen sensor.
Deteriorated downstream oxygen sensor.
Deteriorated Upstream Oxygen Sensor.

The Motronic ECM has internally diagnosed that the switching characteristics of this oxygen sensor have degraded to a point where exhaust emissions will be increased.
This fault is normally caused by the aging of the sensor in normal operation, however, this effect can be accelerated if the sensor has been contaminated with oil or other surface contamination.
Please feel free to call us at 480-421-9048 if we can help you further, we do service Land Rovers & European vehicles.. thank you!
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