Too lean air-fuel mixture can cause misfire, uneven idle, delays or twitching during acceleration and / or poor engine performance.Įxcess air can enter the engine due to the following reasons: vacuum leak a dirty air flow sensor that is not able to correctly record the air flow the exhaust gas recirculation (EGR) valve does not close and passes exhaust gases into the intake manifold too high flow through the EGR valve (EGR differential pressure sensor is faulty and underestimates the consumption of recirculated exhaust gases). This state of the mixture indicates that the engine draws in too much air and / or the fuel system does not supply enough fuel.
#WHAT DOES P0171 AND P0174 FORD ENGINE CODES MEAN CODE#
In cars with four-cylinder engines (without a second cylinder block), this code does not occur. P0174 – lean mixture code for the 2nd cylinder block located LEFT (driver’s side) in Ford vehicles with a transverse engine and front-wheel drive. P0171 – lean mixture code for the 1st cylinder block located RIGHT (passenger side) in Ford vehicles with a V6 or V8 engine and rear-wheel drive. If the mileage is large enough, both codes are likely to appear. When the “Check Engine” indicator lights up, either of these codes, or one of them can be detected during car diagnostics by a scanner or a code reader connected to the car’s diagnostic connector. On Ford vehicles, error code P0171 means too lean mixture (too much air, not enough fuel) in the 1st cylinder block, code P0174 means too lean mixture in the 2nd cylinder block. P0171 and P0174 – lean mixture codes in Ford cars P0171 and P0174 – lean mixture codes in Ford cars
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