2004 A3 2.0 fsi sport.
While driving the other day my car lost power and became unresponsive to throttle input ( travelling at 70mph in 6th gear ) I put my foot on the clutch and pressed down on the throttle and the engine revved freely, took my foot off the clutch and still no power. The power returned after a few seconds and was driving normally until it happened again when I was just at the top of a hill and took my foot off the throttle.
When driving in town it has also started to lose & regain power, usually on a slight upward slope and when I have just changed gear from 1st to 2nd or from 2nd to 3rd. Has also lost power when on the flat in 3rd, 4th & 5th gear, usualy for a couple of seconds then power on for a second then no power again then it comes back and is fine.( has happened at various speeds between 20mph - 70mph )
Pulled the codes and came up with.
16825 - evap emission control
16575 - fuel pressure sensor - plausible signal error
18974 - low fuel pressure
17480 - nox sensor
Had the following done..
Pressure tested fuel rail
Cleaned rail pressure valve & sensor
Stripped & cleaned throttle body & TPS
Replaced fuel filter.
Checked all connections & hoses ( none loose and no cracked hoses )
Took it for a spin and the problem still exists but is now more frequent.
Pulled codes again and only got.. 16575 - fuel pressure sensor - plausible signal error
Power loss seems to only happen when engine is warm.
Seems to happen only when you have eased your foot off the throttle and reapplied it.
MIL has not come on before, during or after any power loss event.
Probably coincidence ? but I have had 3 bulbs blown in the past week.
Now thinking of replacing fuel pressure sensor but not sure if that will achieve anything ?
Any ideas ?