P0251 and P1211 are unfortunately just indicators of a problem, usually in the fuelling system. The injectors don't lose codes. Your car is an early model and had a two box system for controlling the engine (ecu) and the injectors (icu) and most diagnostic systems including Fords own IDS cannot read the codes.
When faced with Ford Transit Connect fuel pump problems or Ford Transit 2.2 fuel pump problems, there are a few repair options available. The first option is to replace the entire fuel pump assembly, which includes the motor and filter as well. This can be an expensive option but is often necessary if the damage to the fuel pump is severe.
It appears they now offer a "Deluxe Edition" with live hyperlinks, for $130: " DeLuxe Edition contain the same manual, but is full operational with hyperlinks (Interactive pdf), bookmarks detailed on three steps and also have the connector details.
o72NSC.