In quick conclusion.if you put on an aftermarket intake, there is a CHANCE that you may get a check engine light. Here are some A/F readings from the original injen intake. Even with the additional air, at no point does the A/F ratio reach a dangerous "lean" condition. Based on UOA's (used oil analysis's) this difference is not changing or effecting engine wear in any way, shape, or form. The MAF sensor is located in the air inlet tube.
One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. This Cel does not necessarily mean that damage occurring.only that a difference has been noted. If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors. If two concurrent drive cycles occur the PCM throws a check engine light, to let you know a difference is occuring. In the 4 cylinder this is a P0171 code, in the 6 cylinder this is a P0171 or P0174 code. If a change is introduced (more air from a CAI for example), and the SFT changes by a significant amount, the PCM marks a possible problem as a pending code. Thus the computer has the capability to adapt its settings over time to a variety of conditions. The Long Fuel Trim is based on a default map (which is reset anytime you pull the negative battery cable, or reset your cel's with a scanner) and changes after each drive cycle by taking the SFT's data into itself. The Short Fuel Trim is basically a real time collaboration of data, which is a reflection of the current air/fuel ratio of the mazda6.
#Maf sensor mazda 6 p0171 p0174 code#
What Does the Short and Long Fuel Trim have to Do With a P0171 Code?Ī P0171 code (Check Engine Light) is thrown when the engine compares the Short Fuel Trim to the Long Fuel Trim and finds greater then a 9% difference. Quote the almighty crossbow from Mazda6tech: I'm guessing OP has a naturally aspirated 6, therefore.
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