Update:

I pulled out the relay today. The wiper arm came off easily, and I managed to get the cowl completely off which made getting the relay out a lot easier.

So once I got to the relay, I realized that it was slightly different to the one I ordered off audi arlington. The part from audi arlington had 644 on top, and the one in the car already had 614. Besides that, they had the same wiring diagram and I was only getting a slightly higher resistance on the new one compared to the old one. My question is, the relay you received from audi arlington, was it different color and had different numbers at all?

Besides that I did not end up replacing the relay since I was not sure if it was the same one. I also have not had the EPC code come up for a few days now, which is nice but I'm sure it's only a matter of time until it does.

 

Nevermind... the relay is the same, they just updated the part number, but according to audi arlington it is the same relay as the one currently in the car. So I'm going to leave the old one in since I already put it all back together since I wasn't sure if the relay was the same and the old one was still working. Next time I get the ECP light I will change the relay out for sure. I'll update when I do that and let everyone know if the problem goes away.

As far as getting to the relay, it was relatively effortless compared to what I was expecting. There are a few things that are a *little* tricky, but I got by with nothing more than a torque bit set and a set of ratchet bits. The only part that gave me trouble was getting the actual relay out. It took quite a bit of effort and my hands were bleeding by the end. I did pull the tabs that keep the piece of trim running along the bottom of the windshield, that allowed me to lift it up a bit more and get the cowl out completely. I would recommend that since it makes getting into the ECM pit a lot easier.

 

My EPC light started coming on more frequently (i.e, daily). It also started throwing a few new codes (P310B, P0031, and P0031) along with my original five codes (P0444, P0033, P0243, P2400, and P2294). I decided to take my A4 to my independent mechanic for repairs.

I asked my mechanic to replace the J757 fuel pressure relay, the Evap Purge Control (N80) valve, and the Turbocharge Bypass valve. I chose to replace the J757 relay along with the two other parts which seemed to have a history of having to be replaced. Hopefully, the replacement of these parts will take care of the EPC problem.

My mechanic did indicate that my fuel pump pressure was a little high at 55 psi. Interestingly, there was another Audi A4 with the same codes and he was in the process of replacing the fuel pump on that vehicle. However, the fuel pressure on that vehicle at 80 psi was a lot higher than mine.

I will update the thread with the results.

 

Since I pulled the relay I ended up putting the new one in, and I haven't had the EPC light come on yet. Now I'm just going to play the waiting game till something else breaks.