I have had the p0171 for a while now, it only seems to come on (after I unhook the batt.) during normal driving or on cruise control. Sometimes it comes on right away sometimes after 180 miles. I have no intake mods (minus removing the resonator) and I am only 1.5 psi over stock boost. My injectors might be dirty, if they are I are considering just upgrading them to STI injectors, but if I do that with a stock ecu what kind of problem will I run into?