C63bro

So, I have fuel pressure regulator code, TPS, lean bank 1, ESC inoperable at high rev randomly, (which is terrible bcuz it goes into limp mode at the worst times, usually when I’m trying to run with a Lambo..)

on hard right turns I smell gas and my gas gauge is broken as well.

im wondering in which order I fix these issues if it will correct other issues as well.
please help she’s in pain… thanks

update:
got these codes about 4 months ago, before the gas gauge broke and I smell gas on right turns, near driver side rear area. not sure if it’s all connected or not..

​​​​​
P2187: system too lean at idle, bank 1 DTC severity 2 of 3
P228c: fuel pressure regulator
P0171: system too lean bank 1
P2123: throttle position sensor “D”

chassis

How many miles on this car? How long have you owned it? What is the maintenance history? Is all (100%) of maintenance up to date?

Tuned?

phxcars

I highly suggest you to take out the rear bottom seat out and remove the plate to check the sending unit. Mine had a bunch of tiny hairline cracks and fuel started to leak.

eightysixtuned

honestly, it sounds like you have multiple issues. i'd start with what was recommended above, then PCV or vacuum leaks, then oxygen sensors. ESC issue at high rev's sounds like you may have a sensor that is going out. I'd also recommend having a shop or person with Xentry to run diagnostics against your fuel system.

C63bro

thanks for your help
has 100,000 miles
slightly behind on A6 service and oil change.
I bought it 2 years ago in Phoenix and it had maintenance records from MB dealer near Las Vegas. I left it registered in AZ for no smog purposes.
im in Del Mar now. North County San Diego.

not sure if it’s tuned but I can pull on Turbo Porsches for a bit which makes me smile lol

C63bro

thanks bro, I’m digging into it this weekend, my brother suggested replacing the sending unit as well, ordering it tmw along with fuel pressure regulator, hoping that will clear some other codes… I’ll post results

C63bro

I replaced the fuel sending unit last week.
it did have hairline cracks like the common issue with the C63.
i re set the ECU, after driving a bit I’m still getting ESC malfunction at high revs randomly…
I still need to re run the diagnostics but was hoping the ESC malfunction could have been related to the faulty sending unit.
any advice from you pros would be much appreciated.

C63bro

not much advice here it seems
maybe I should just sell it and get the C63s, that forum seems more active….