I have a 1998 UK Volvo V70 TDI - 140k miles. I recently had a new clutch and flywheel fitted and when I got the car back the Lamda Sensor light was on.

I didn't think diesels had Lamda Sensors and looking down the exhaust manifold I certainly can't see any sign of one. Is the Lamda Sensor light used for something else on the diesel? Any idea what it means and more importantly how to switch it off again?

 

Usually the european market the Lamba light is the Check engine light.
I would have the shop that performed the work on the clutch look at it.
They might have left something loose or off causing the light to come on.