help needed VAG-COM errors - 1.8T VAG engine

[jase555]

hi folks can anybody help, engine poorly VAG codes keep coming on, basically need to know if this will be a dear one to fix. Car is 7yrs , 80k on the clock always serviced,

weird one is all of the above mpg still standard (to me anyway) results from VAG below, MOT due soon

16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-10 - - - Intermittent
16514/P0130/000304 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
P1297 - 35-00 - -
17705/P1297/004759 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-00 - -
17544/P1136/004406 - Fuel Trim: Bank 1 (Add): System too Lean

16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
Readiness: 0000 1001
16486/P0102/000258 - Mass Air Flow (MAF) (G70): Signal too Low

01314 - Engine Control Module
013 - Check DTC Memory – Intermittent

01039 - Coolant Temperature Sensor (G2)
30-10 - Open or Short to B+ - Intermittent
01039 - Engine Coolant Temperature Sensor (G2)

thanks in advance

jase