Yes, the catalytic converter can affect acceleration—especially if it’s clogged or failing.
While its main job is to reduce harmful emissions, it also plays a key role in your exhaust system. If it isn’t functioning properly, your engine’s performance, power, and fuel efficiency can suffer.

What Does a Catalytic Converter Do?

The catalytic converter is part of your vehicle’s exhaust system. It:

• Converts harmful gases (like carbon monoxide and nitrogen oxides) into safer emissions
• Relies on internal materials (platinum, palladium, rhodium) to trigger chemical reactions
• Allows exhaust gases to flow smoothly from the engine to the tailpipe

How It Affects Acceleration

✅ When It’s Working Properly:

• It does not restrict power
• Exhaust gases flow efficiently, allowing the engine to breathe and accelerate smoothly

❌ When It’s Failing or Clogged:

• Exhaust flow becomes restricted, like a plugged pipe
• Causes backpressure, which makes it harder for the engine to push out gases
• Leads to symptoms like:
  • Sluggish acceleration
  • Loss of power under load
  • Reduced throttle response
  • Increased fuel consumption
  • Check engine light (with codes like P0420 or P0430)

Signs Your Catalytic Converter Is Affecting Acceleration

• Your car hesitates or stumbles when accelerating
• Feels like it’s “choking” or lagging when you press the gas
• You hear a rattling sound from under the car (if the internal material is breaking apart)
• Strong sulfur or rotten egg smell from the exhaust
• Poor fuel economy with no obvious reason

Can It Be Cleaned or Fixed?

• Minor carbon buildup may be improved with fuel system cleaners or catalytic converter cleaners
• Severely clogged converters usually need to be replaced
• Regular maintenance (like fixing misfires or oil burning) can prevent premature damage

Final Thoughts

Yes, a catalytic converter can absolutely affect acceleration if it’s not working properly.
A clogged or damaged converter creates backpressure, which can rob your engine of power and make driving feel sluggish. If you notice a drop in acceleration and suspect your catalytic converter, it’s worth having it diagnosed before it leads to more serious engine issues.