MikeL

...since my last post (link below), i've replaced with new:

- battery
- fuel pump
- fuel pressure regulator
- bypass valve
also cleaned the ISV & MAF and their connectors.

Car no longer has the stalling problem, but i'm still getting the two DTC's.

Car is a 95 S6 running IA III+ software, 102K miles.

Any help would be appreciated.

THANKS!
Mike<ul><li><a href="https://forums.audiworld.com/s4s6/msgs/109727.phtml">https://forums.audiworld.com/s4s6/msgs/109727.phtml</a</li></ul>

UrS4boy

that there is a fuel pressure problem.

2341 at the low end = fuel tank low (less than 10 L) resulting in fuel system pressure that is less than 3.3 bar (48 psi). Also "ignition system failure" (???)

2341 at the high end = Engine intake air leak after Mass Air Flow sensor (G70) (CHECK THIS)
-leak in exhaust system ahead of three way catalytic converter
- heated O2 senor (G39) malfunctioning (THIS COULD BE IT???)
- fuel system pressure greater than 4 bar (58 psi)

UrS4boy

- fuel system pressure too low.

- spark plugs, ignition coil, ignition coil power output stage (POS) malfunctioning

- leakage in exhaust system before three way catalytic converter

-incorrect signal for mass air flow sensor (G70)

Solutions include filling fuel tank, repair leakage (re: MAF), check fuel system, check fuel system pressure, check G70 (MAF).

Are you near anybody with a MAF that you can swap for a few minutes?

4Driver4

My money's on the MAF.

S4-Fireblade

2nd!

MikeL

Thanks Dave, I really appreciate all the advice! I'll have to find an MAF to swap and test.

VR_Life

The error codes your showing indicate the ECU is attempting to adjust fueling but it can't reach the goal A/F ratio as determined by MAF, MAP &amp; O2 sensors before it runs out of room for adaption.

If it's not a bad sensor then it has to be a real fuel supply problem. Since you've replaced everything else then also try the injectors ;-)

MikeL

then might as well go full RS2 with injectors and new software, if the 02 sensor and MAF don't do the trick.

Mike