What Are the Most Common Signs of a Failing Catalytic Converter in a Toyota Hilux?

Home > Gari Forums > Toyota Forums > Toyota Hilux Forums > Toyota Hilux Catalytic Converter Issues Forums

What Are the Most Common Signs of a Failing Catalytic Converter in a Toyota Hilux?

A bad catalytic converter can cause poor engine performance, increased emissions, and strange noises. Have you noticed any of these symptoms in your Hilux?

Lubaba asked on 11 Feb 2025 16:26:35 pm

1 Answer

18 views |

Car Mechanic Expert - on 11 Feb 2025 16:30:36 pm

A failing catalytic converter CAT can reduce engine efficiency and increase emissions. Common signs include:

🔴 1. Poor Engine Performance – Loss of power, sluggish acceleration, o r hesitation.
🔴 2. Reduced Fuel Economy – More fuel consumption due to a clogged converter.
🔴 3. Rotten Egg Smell – A sulfur-like odor from the exhaust due to unburned fuel.
🔴 4. Dark o r Excessive Exhaust Smoke – More carbon buildup leads to dirty emissions.
🔴 5. Rattling Noise from the Exhaust – Broken ceramic material inside the converter.
🔴 6. Check Engine Light CEL Illuminated – Oxygen sensor detects inefficiency in the converter.

📌 Solution: If you notice these symptoms, inspect the catalytic converter immediately.