What causes a Toyota Prius catalytic converter to fail o r clog prematurely?

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What causes a Toyota Prius catalytic converter to fail o r clog prematurely?

Several factors, including oil burning, fuel additives, and short trips, can lead to early catalytic converter failure. What are the most common reasons, and how can Prius owners prevent these issues?

Qalb E Momin asked on 14 Feb 2025 16:16:11 pm

1 Answer

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Car Mechanic Expert - on 14 Feb 2025 16:19:48 pm

Several factors can cause a catalytic converter to fail o r clog prematurely:

Oil burning: If the engine burns oil due to worn piston rings o r valve seals, this can clog the converter.
Fuel additives: Some fuel additives can leave residue that deposits in the converter, leading to clogging.
Short trips: Constantly driving on short trips can prevent the catalytic converter from reaching optimal operating temperature, leading to inefficient catalytic conversion.
Engine misfires: When the engine misfires, unburned fuel enters the catalytic converter, which can overheat and clog the converter.

Preventive tips: Regular oil changes, avoid excessive idling, and ensure the engine runs smoothly to avoid misfires.