Usually on the outlet side of the air filter box. But a mass airflow sensor is always going to be in between the air filter and the engine.
SOURCE: how do i replace mass air flow sensor on a 1999
u don't replace the whole sensor just the actual heated wire part, that is held in place by two star screws, see picture.
A-1 CARDONE Part # 7450015 {[Mass Airflow Sensor] Reman.} $142.00
SOURCE: Location of mass air flow sensor, 2000 Grand Prix GTP
Hi:
The mass air flow sensor is a round sensor that is mounted in the air intake, between the air cleaner box and the engine throttle body.
SOURCE: where is the mass air flow sensor 1999 bonniville?
It is in the air intake between the filter and the intake manifold.
SOURCE: location of mass air flow
It should be along the air intake. A block box about 1 1/2" x 2 1/2" held on by 4 ? screws. Easy to replace, but kind of pricey. They make a product for cleaning them. Try that first. Do not touch the wire resistor that goes into the intake. It's delicate.
SOURCE: mass air flow sensor location
3.1 liter - It will be in the air snorkel in between the air filter housing and the throttle body.
3.8 liter - it will be mounted in the throttle body right before the throttle.
Both will have a flat 3 wire connector.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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