What are the most common emissions-related problems in the Toyota Prius?

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What are the most common emissions-related problems in the Toyota Prius?

Despite being a low-emission vehicle, the Prius can still develop issues with the catalytic converter, EGR system, and oxygen sensors, leading to increased emissions and reduced efficiency. Discussing these problems can help owners maintain a cleaner-running vehicle.

Zarnish asked on 13 Feb 2025 12:35:07 pm

1 Answer

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Car Mechanic Expert - on 13 Feb 2025 12:43:48 pm

Despite its low-emission design, the Prius can still develop some emissions-related issues:

Catalytic Converter Problems: A clogged o r failing catalytic converter can lead to increased emissions.
EGR System Issues: The Exhaust Gas Recirculation EGR system can clog over time, affecting emissions and engine performance.
Oxygen Sensor Failures: Faulty oxygen sensors can mislead the engine control system, causing improper fuel-to-air ratios and higher emissions.