Hello All,
I am trying to troubleshoot "P0172-008" and "P0175-008" codes in my V8 Audi R8. Here is background story.
I acquired the car last year and decided to do a little tune up. This tune-up included replacing spark plugs, coil packs, new air filters, performing carbon cleaning of intake valves and replacing PCV/Air-Oil separator device (OEM replacement). Fuel injectors were pulled and sent for ultrasonic cleaning and flow-matching. Seals were replaced on the injectors. After I assembled everything, car fired up and is running smoothly. However I started having those "P0172-008" and "P0175-008" codes and after I clear these codes it takes about a week for the error codes to come back. These codes were not present before tune-up.
I tried to use VCDS to see if I can get some clue as if it is an injector issue, vacuum leak issue or MAF problem. When I tried to run 'Fuel Supply System' test, it passed on Bank 2 but failed for Bank 1 (image attached). I am also attaching the images of fuel trim.
So I was wondering;
1) What does "Group 107 - Fuel Injection (Fuel Supply System)" test for? Does it run test on injectors or fuel pump or may be on anything else? Is there anyway to narrow down the cause of not passing test any further? Is it possible to check for injector performance or fuel pump flow rate in VCDS?
2) In the error code "P0172-008" what does '008' indicates? Does '008' narrows down the cause of system running to rich?
Thanks.
Images ---> https://imgur.com/a/IPrTQdU
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