The air flow sensor (meter) measures the amount of air that is flowing into the engine manifold. This sensor is critical to obtaining the proper air/fuel mixture. If you car has recently backfired, you may have damaged the sensor flap that measures the air flow into the engine.
Air injection pipes and valves are part of the emission systems of a car. They are used to inject additional air into the combustion camber. If you are having problems passing a Smog test this may be part of the problem.
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