Hello everyone I'm Michael McLeod I just joined this website!I have a question for everyone what's a P0171 code mean for a 1997 Buick Riviera supercharged my Rivera currently has 147,000 thousand miles on odometer anyways my car runs and idles just fine my acceleration and supercharger aren't affected by the service engine soon light,I just need to know if anyone could please tell me what the P0171 code means thank you?