I just had the air box off on my 2001 TT and noticed the MAF sensor itself has 5 pins but the female plug that connects to it only has 4. Is this normal?

 

Normal meaning?
I mean what are you lookng to do?

 

Well I've been troubleshooting a boost issue and I just noticed this when I was putting everything back together. I came across a couple posts on other boards and it seems to be that the female connector does indeed have only 4 contacts while the MAF has 5 male pins.

Got another question. Not sure if you know the answer but is limp mode accomplished by affecting the N75 valve? I mean is that how the car enables limp mode? I've already found and repaired a couple leaks and I'm going to test once again but I'm just trying to understand everything involved. Thanks.

 

Correct, everytime I play around with the N75, I go into limp mode.
I have installed a MBC and I had to plug the ports of the N75, keeping it electrically plugged in, so I can cheat the ECU. I run about 20psi of boost and hold around 17-18psi
I run Maff-Less so I will check the connections and see whats up.

 

OK. I'm about to go do another leak test to make sure I haven't missed anything. How do you run w/o MAF w/o messing up your fuel air ratio?

Guess maybe I'll order a MBC. Not too much $$ Any chance you could post pics of how your N75 is plugged? Thanks.

 

Yes my fuel to air is probably screwed up, but It runs well and I can't see paying that much for a mass aif flow sensor. I'll work on gettin pics today on the MBC install and N75.