I have an 05 wrx that is at stage II. My car recently had a 171 OBDII code (lean fuel condition, I cleared it w/ accessport). I have also been noticing the my autometer boost gauge is apparently not reading boost levels correctly. Tyically in the past when things have been operating correctly, when I'm off throttle the gauge reads about 15-20 psi vaccum pressure and max boost is around 13-16 psi. Now max vaccum pressure is on 1 psi and max boost is 10 psi. I believe the gauge is correctly properly.
1) Might this apparent boost issue have something to do with the lean fuel condition?
2) Can I use my accessport, v1, to measure boost while driving to see if the problem is the guage or something else? (the accessport manual says not to use the accessport while driving)
Any ideas sirs or mams