Q: Does not let me go beyond 20 mph

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My car doesn't let me go past 20 mph. Once I pass 20 mph it takes long to pull off. And eventually it does but it makes a noise. The check engine light is on what can be causing this? Could it be the catalytic converter. I haven't used the machine to check the codes yet

My car has 130000 miles.
My car has an automatic transmission.

What you are describing sounds like you may have a clogged or damaged catalytic converter. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When the catalytic converter is clogged, this causes these gases to be backed up into the exhaust system not allowing the engine to breathe properly. When this happens, the engine is forced to work much harder to expel these gases. This often results in the engine bogging down, hesitating, shaking and causing very poor fuel economy. This should also cause a check engine light to come on as the O2 sensors should be reading the incorrect amounts of oxygen in the exhaust gases if this is your problem. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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