A4
2002.5
1.8t

Problem : The fuel mixture is too rich and causing my engine light to come on.
I already took to local shop and im getting an BXXXXX error code.
(ill post the code tom. when I find out)

There is alot of pressure coming out my gas tank when I refill. I have to wait 5 min or else the pump pops like its full.

I first noticed when my car randomly wouldnt let me go passed 4k RPM with a good warm up. it seemed like was being governed but i know thats not normal.

then later noticed that when I turn on my AC I couldnt go passed 4k at all in each gear.

lastly, my mechanic and i notice a hissing sound coming from the bushing of a thin AC pipe. ( the bushing has 2 pipes connected to it, and its on the back right corner of the engine.)

any ideas?

 

so the code is P171 or P174 from bank 1. its saying it too lean now.

any ideas?

 

Sounds like a sensor problem or MAF.