You may get lucky with one of the simple repairs mentioned above. A broken vacuum hose sucking in air can be around $50, or a clogged fuel filter for $100. On the other hand, an oxygen sensor or mass air flow sensor can bring a bill of $400 to $500 dollars.

Can a dirty air filter cause a lean code?

If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.

What causes P0171 and P0174 codes Ford?

COMMON CAUSE: A DIRTY MAF SENSOR One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. The MAF sensor can also be contaminated by fuel vapors that back up through the intake manifold and throttle body when the engine is shut off.

What causes the p0174 engine code on a Ford Mustang?

To keep the engine running properly, the powertrain control module (PCM) tries to compensate for the lean condition by injecting more fuel to the mixture in an effort to maintain the proper 14.7:1 ratio. When these adjustments become too large, code P0174 is triggered.

What to do if your check engine light comes on p0174?

If the check engine light comes back on with code P0174 continue the diagnostic process. If check engine light code P0174 persists after you have reconnected and replaced all damaged vacuum lines and cleaned the mass airflow sensor, perform a fuel pressure test. If any components in the fuel system are failing, replace them as necessary.

What does the DTC code p0174 stand for?

Diagnostic trouble code (DTC) P0174 stands for “System Too Lean (Bank 2).” The code indicates that your car’s computer has detected a lean running condition. A lean condition is brought about by an imbalance in the air-fuel ratio due to either insufficient fuel or excessive air entering the engine.

What is the Ford Windstar code p0174?

On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem. It’s a very common problem for the Ford Windstar. 1999-2003 Fords Windstar Code P0174. The problem is with the rubber grommets in the intake manifold bolts they will crack and cause an intake leak.