Chatted with Chongo about this, and here is his reply:
Hope this helps
Ok PO171 per obd2 means too lean bank 1 and per obd2 PO174 means sys too lean bank 2.
PO171 per LR’s codes means system too rich bank 1
injector 8 excess emissions/ catalyst damaging level of misfire
Probably got one of the wires out of order, which is probably what set code # PO174 per LR’s codes means system too rich bank 2 multiplication injector adaptive fueling rich limit exceeded RH bank.
Land rover incorporates a plug firing system called “wasted spark” Designed by Bosch It works per this link.
http://forums.landroverworld.org/showthread.php?t=12020
You cannot get away with a single plug out of order or processor or CAT failures will be imminent, let alone detonation issues.
The only thing I know of that sets a PO171 code is when someone gets one of the wires out of order, a plug wire falls off or missing issues.
What sets a PO174 is either a plug not firing, a miss, a lean condition that the adaptive software in the processor cannot compensate for. The processor will then run in a open loop, after several attempts to correct it. also a injector that is stuck open will cause this but is rare. Chongo