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The Lamda Sensor on mine was located just before the catalytic converter. Once you've jacked the car up (and axle stood) it'll take you all of about five minutes to change the old one for a new one. It's just a case of using a spanner to undo the sensor from the exhaust and unplugging the other end from its connection and vica versa for refit.
Good luck and hope it solves the problem.
PS: GSF, I found were the cheapest for Lambda Sensors in my area so it may well be the same for you, it could be the difference of £20 or so.
Currently in scatz's garage:
2004 Subaru Legacy GT Spec B, a 2013 2.0 TDCi Titanium X Sport S-Max and a 2001 Honda NSR125R