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Usually it is difficult to install a maf backwards unless modifications (and an associated mistake) have been made to the intake system. this also depends on the design of the sensor and sensor housing.

When installed backwards, the vehicle may idle fine and even rev with no problem; however, while driving, most assuredly the check engine light will come on, the vehicle will hesitate and stall when attempting to accelerate, etc. Diagnostic codes will point toward the maf sensor malfunction.

The sensor is not able to properly calculate the flow of air to the engine, thus causing the problems.

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Q: What happens when a maf sensor is installed backwards?
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