Car Questions
RepairPal is your advocate for car care advice and guidance

What is code PO174 and PO171?

(1999 Ford Explorer)
in Alpharetta, GA on November 29, 2010
CHECK ENGINE light comes on. When this happens I get code(s)PO171 andPO174
Displaying 3 answers & 0 comments
Popular Answer
on November 29, 2010
OBD II Code P0171 and P0174 = Fuel System Too Lean (Bank 1 or 2).

There is very nice information about these codes in the RepairPal Encyclopedia;
Sign in to reply
on November 29, 2010
Think intake manifold o-rings...if it's a 4.0L SOHC engine.
Sign in to reply
on November 29, 2010
System too lean bank one and two, likley vacuum leak.
Sign in to reply
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
My speedometer will climb to 50 mph when i start to roll, (except when it is cold, i live in mt). no matter my speed,...
So...drove it home...ran fine...check tranny fluid...looked great...nice and clear with no leakage....then....the ver...
Didn't find what you were looking for?