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Hi Andy, I dont know where the sensor is specifically, but without knowing if that mpg is from town driving or a mixture of A & B class roads, then its hard to tell if its unreasonable.
You can perform a few checks to ensure that the car is as good as it can be without spending cash checking things out unnecessarily;
- don't carry excess weight in the car
- don't use a roof rack except when you need to
- get the tyre pressures to the correct level
- check the air filter for blockages
- when was the car last serviced? This can cause mpg to rise
These will ensure that the car is at its optimal level of efficiency as it stands.
You may wish to try a tank of higher-octane fuel and giving it a bit of a blast on the motorway - the additives are good at clearing out any deposits which inevitably build-up as part of the combustion cycle.
Try some (or all) of the above, and see how you get on - if the car seems to be running fine, and its only the mpg which is a concern, then in all probability, its just a small bit of adjustment that's needed as opposed to major replacement.
Hope it helps,
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater