When I fully step on the accelerator the vehicle will be moving at a speed of 40kmh and I can't even over take other vehicles
My car has 15000 miles.
My car has an automatic transmission.
Hi there. The lack of acceleration you feel suggests several possibilities. There could be low fuel pressure caused by a faulty fuel pump or a faulty fuel pressure regulator. It could be a lack of incoming air to the engine caused by a very dirty air filter or a faulty MAF (mass airflow) sensor, incorrectly calculating the incoming air to the engine.
A restricted exhaust system caused by a plugged catalytic converter is also another possibility. There are more possibilities: a faulty TPS (throttle position sensor), engine or ignition timing problems, etc. I recommend having your vehicle's [lack of power during acceleration](https://www.yourmechanic.com/services/car-is-not-getting-enough-power-inspection diagnosed and repaired by a certified technician, such as one from YourMechanic.
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