Have just completed a full engine service on my Freelander2 TD4 2.2 diesel, ran ok first day now showing B100A-15 fault code?
Started to show signs of slow response to accelerator pedal, seems ok at high revs, just pick up at low revs?

A thread on Landyzone:

https://www.landyzone.co.uk/land-rover/b100a-15.390322/ Landrover - turning owners into mechanics since 1948

2014 Orkney grey Freelander SD4 GS.
2004 Zambezi silver Discovery 2 Td5 (Gone)
1963 Surf blue Morris Mini Minor Super de Luxe (my little toy)

Did they change your Fuel Filter for the CORRECT LR part? There is a valve in the Official Specification Fuel Filter.

Please can you fill in your cars year and type on your profile page.

Have you ever had a Restricted Performance (Limp Home) message?

Any Car History would help, as not all problems give codes (but checking OBD errors is normally a Must Do.

Try clearing errors and rechecking after a couple of days. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 79k+ miles) (MY2015)
Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History
(Expensive, but Trouble/Worry free - hopefully?)