Did he give you the error code? If you can get an answer out of him,
here are the locations of the O2 sensors.
O2 sensors are in the exhaust stream. Depending on what code you
are getting it will tell you which sensor.
Bank 1 Sensor 1 - Drivers side of engine (front if a front wheel drive car)
before catylitic converter
Bank 1 Sensor 2 - Same side after catylitic converter
Bank 2 Sensor 1 - Passenger Side (rear) before catylitic converter
Bank 2 Sensor 2 - Passenger Side after catylitic converter
If you can get him to tell you which one is bad, you can order one
from Rockauto or find one on Ebay. Then just have someone put it in
for you or do it yourself.
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