TYoung

I have a 2006 A4 2.0T and I'm getting mutiple codes on the CEL.

P1093 - Fuel Measuring System 2 Malfunction, Implausible Signal
P0455 - EVAP System Large Leak Detected, Upper limit exceeded
P2187 - Bank 1 System too lean at idle, no signal/communication
P0441 - EVAP Emissions Control Sys Incorrect flow Lower limit exceeded MIL-On
P2261 - Boost Pressure Control Valve (N249) mechanical malfunction

The car has hard starting after filling the gas tank
And the N80 purge valve makes a really loud ticking noise when the car is running
And there is a loud whining noise sounds like it is coming from the N80 when I shut down the eninge.
After reset, CEL doesn't go on until I get it on the freeway

I'm thinking of starting with the N80 purge valve. Any other thoughts? Would I get all those codes just from that one valve?

gpgyo

When I had the hard restart after fueling problem with my 2006 A4 2.0T it was the N80 so that's a good place for you to start. Before replacing it, I was getting codes P0441 and P0171 both of which went away after replacing. The part is around $25, you'll need replacement hose clamps and it should take you about 10 minutes to change it.

audi.horch

I had those problems with my Avant, I even run out of gas while my fuel showed that I had 1/4 tank left, when I went to the dealer, they changed lots of parts & thank god I had the Avant as CPO, the bill was over $1,200 I paid $83. Good luck.

TYoung

Thanks! I replaced the n80 and the fuel filter since I had it and hadn't installed it yet. No CEL so far...