Audi Repair: DTC Errors: AUDI A4 1998 1.8T Quattro AEB, air flow sensor, vacuum leaks

Question
Hi there,
I have thoses errors :
P0441 : EVAP Emission Contr.Sys.Incorrect Purge Flow.
P0455 : EVAP Emission Contr.Sys.(Gross Leak) Leak Detected
P1136 : Long Term Fuel Trim Add.Fuel,Bank 1 System too Lean
P1602 : Power Supply (B+) Terminal 30 Low Voltage

I have check the EVAP canister purge regulator valve and it seam ok. I check the EVAP Leak Detection Pump and is seam the Ohms is a bit lower that what is should be. I believe it is defect, but more test should be done on it.

I have no clue about the P1602.
And P1136... I only have one side so Bank 1 mean the only rail injector that I have? Even there, not sure what to do.

Can you give me good tips?  

Thanks

Answer
hi
P1602- do not worry about this fault, It always shows up when battery goes down or is disconnected.
P1136- this fault is set by vacuum leaks or faulty mas air flow sensor. Before replacing MAF sensor check all vacuum hoses, most like it one or more is broken.
P0441 and P0455. \
if you have VAG you can run tests for evap leak and evap solenoid. Just go to basic settings, channel 70 and 71.
P0455 is sometimes set by loose or leaking gas cap.
P0441 mostlike it --- bad purge solenoid, they like to get stuck sometimes.
If one of the test fail (not ok) let me know.
good luck                     pltech