engine faults

[conchurl]

hi i have 3 fault on my engine ecu on my year 2000 406 hdi 110 2.0
number1: Permanent fault. fault Pre/post heating relay circuit. relay opened
number 2: Intermittent fault. air flowmeter signal. open circuit or short circuit to earth. flow too low
number 3: Intermittent fault. Accelerator pedal signal 2. Coherence with accelerator pedal signal 1.

i have had fault number 1 and number 2 with a few weeks but fault number 3 has just popped up earlier the auto diagnostics light and air bag warning light came on on the dash that was why i checked any idea how to fix the faults i cleared number 1 and 2 before but they came back but i had more power while they were gone.