Epc light
 

Hello a few weeks ago my epc light came on. Car stalled would not accelerate or nothing. This all happened after I had a fuel system clean done. When it came on I got to my destination and 1 day later it was fine now issues. Two days ago it came back on. I turn car off it went away no problems. Now it's back on won't turn off and I can feel misfire when I try to accelerate. I've read many articles. Some say ignition coils. Some say speed sensor others say fuel pump.... The check engine light is also on. I have a 2007 Audi A8L 4.2 Quartto.. Any suggestions before I let my Audi dealership take me to the bank?

Major issue here....my epc light came on but no check engine light has come on yet. I spoke with audi specialist from germany..... who stated to check the battery to see if it was low. Due to the low battery the speed sensor ingition sensor and several other sensors stated to fail. Replaced the battery and everything was ok...but if driven for awhile these sensors will permanently be damaged. Tech stated to change battery as soon as possible.