Service engine soon light, code from scanner reads P0102/ MAF or VAF circuit low input. What is the VAF and could bad 02 sensors be setting this code? Thanks

The Volume Airflow (VAF) / Mass Air Flow (MAF) / Intake Air Temperature (IAT) sensor is located on the air intake housing tube inlet.

Your code is P0102 - Mass Air Flow (MAF) Circuit Low Input, them basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.



Fig. Identifying mass air flow sensor connector-3.5L, 3.8L, 3.9L and 5.3L engines

Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.

Causes: A code P0102 may mean that one or more of the following has happened:
The MAF may be disconnected, or a wiring connection may be bad
The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF).
The MAF sensor may be faulty
The vehicle computer may be faulty (very rare)

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
Inspect for any air leaks near the MAF sensor.
Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
Replace the MAF sensor.


Then, like a reference guide check this TSB DTC P0102 MAF and this article about Mass Air Flow sensor, what does it do and how it does it.
Test, check it and keep us updated.

Abotu Oxygen Sensor - O2 codes, will need look some code as P0420 in your OBD II codes reader to check O2 sensor wiring for damage from resting on exhaust pipe or frayed wiring.

Hope this helps.

02 sensors do degrade as they age and the negleted sensors will destroy other related emmision items if not replaced in time. Have a trained tech fill you in better after he completes a full dianogtics check for you. You catylitic convertor can be going bad as well