I been getting system too lean bank 1 & 2 codes when I drive on the fwy, it turns on the after a few days it will turn itself off, then turn back on when I go on the fwy again , this have happened about 4 times, on the wideband says 10.1 at WOT. Can it be the blow off valve? I have the cheap procharger black one,any ideas?

 

Get with your tuner and have it worked out. Unlikely that its mechanical unless there is an exhaust leak before the O2 sensors.