In Civic 2021, it is one of the important sensors of EFI engines. It is a sensor that measures the air flow drawn into the engine, converts the drawn air flow into an electrical signal and sends it to the electronic control unit as one of the important signals for determining fuel injection.
SOURCE: my car doesnt accelerate properly as it hits 20mph
run it without the air filter and see if it makes a difference. does it shake? missfire? any DTC's(diagnostic trouble codes), Check engine light on? Does it do the same thing when in park and pressing on the gas gently? Does it bog down? It can be as simple as the air filter. The other thing that comes to mind is the intake manifold gasket. Try spraying some starter fluid around the intake manifold(car on) and see if the car stalls or shakes.(do this step with engine started from cold for your safety)
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Thank u so much for your responce to my question .it helped me solve my problem .
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