How does a clogged catalytic converter affect Prius performance and fuel efficiency?

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How does a clogged catalytic converter affect Prius performance and fuel efficiency?

A blocked converter can restrict exhaust flow, leading to poor acceleration, overheating, and increased fuel consumption. How can Prius owners diagnose a clogged catalytic converter?

Qalb E Momin asked on 14 Feb 2025 16:16:05 pm

1 Answer

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Car Mechanic Expert - on 14 Feb 2025 16:19:13 pm

A clogged catalytic converter can severely impact performance and fuel efficiency:

Reduced acceleration: The exhaust flow is restricted, causing sluggish acceleration and a noticeable decrease in engine power.
Engine overheating: The clogged converter traps exhaust gases, causing heat to build up in the engine, which can lead to engine damage over time.
Increased fuel consumption: The engine has to work harder to push exhaust gases through the clogged converter, leading to higher fuel consumption.

Diagnostic tips:

Check for backpressure in the exhaust system.
Perform a visual inspection for physical damage o r corrosion.
Use an OBD-II scanner to check for P0420 error codes Catalyst Efficiency Below Threshold, which can point to converter issues.