CNSensors

16555/P0171/000369 Fuel Trim; Bank 1: System Too Lean Possible Causes. Mass Air Flow Sensor (G70) defective; Intake System Leak(s) Possible Solutions

Replacing the secondary air injection pump when a faulty oneway check valve or defective wiring is causing this code to be set by the PCM. Hopefully, the information in this article has been helpful to point you in the right direction to correct the problem with your secondary air injection system air flow/pressure sensor circuit bank 1 fault ...

If the degree of air flow or sensor voltage varies by more than a preprogrammed amount, a code P010F will be stored and a malfunction indicator lamp may be illuminated. Code Severity Symptoms The likelihood that major drivability and fuel efficiency issues will accompany a code P010F is great, therefore it should be addressed with a certain degree of urgency.

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· A defective or clogged MAF sensor can supply incorrect input signals to the engine control unit (ECU) which, as a result, controls other components incorrectly. WHY IS MY MASS AIR FLOW SENSOR FAULTY? A faulty MAF sensor is often indicative of a problem somewhere else in the system. After all, it is highly unlikely for a sensor to clog on its own.

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The mass air flow (MAF) sensor, part of your vehicle’s electronic fuel injection system, is responsible for calculating the total amount of air entering the engine. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. You’ll notice if the …

· So, a failed mass air flow sensor, causes various driveability problems. Don’t be fooled, as a faulty mass airflow sensor, can show symptoms, similar to low compression or low vacuum. And, can be similar to when your vehicle has, low fuel pressure. Here are some of the most common symptoms, of a faulty mass air flow (MAF) sensor:

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· Taking this into account, the output value (Volts or Hz) that the mass airflow sensor will generate, and that you can verify with a multimeter, will be greater at 2500 RPM than at 900 RPM. Another very important thing to know, when testing a mass air flow sensor, is that we don''t need to know the exact voltage value for certain engine RPM.