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It is likely that the car has a protection mode. The engine management system has detected a problem and will has limited the engine so you do not do damage.

Normally it should reset when you turn off the ignition but if it does not then you will need to get the car looked at by a professional.

It could be as simple as a faulty sensor but it could be something much more serious.

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Q: What does it mean when the car doesn't accelerate beyond 20 mph?
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