Land Rover Repair: check engine light, vacuum leaks, maf sensor

Question
I have a 1999 RANGE ROVER 4.6HSE, 100200 miles on it. I took it to a local mechanic because of the check engine light. And he gave me a OBO print out consisting of 5 codes: 1-P1174, 2-P1171, 3-P0174, 4-P0171 and 5-P0733. Can you tell me what those codes are?

Answer
P1171 Oxygen Sensor System Too Lean Fault Banks A & B

P0174 Oxygen Sensor System Too Lean Fault Bank B

P0171 Oxygen Sensor System Too Lean Fault Bank A

P0733 gear 3 incorrect ratio,
P0734 gear 4 incorrect ratio,


This combination points to a bad MAF sensor or significant vacuum leaks.