Rotten Egg Smell When Accelerating
A rotten egg (sulfur) smell during acceleration in a 2019 Toyota Corolla typically indicates a failing catalytic converter or a rich fuel mixture causing excess sulfur in the exhaust. This can also be caused by a contaminated oxygen sensor or a fuel system issue.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal sulfur buildup or inefficient conversion of exhaust gases
Rich fuel mixture – faulty oxygen sensor, fuel injector leak, or mass airflow sensor issue causing unburned fuel
Contaminated fuel – high sulfur content in gasoline, though less common with modern fuels
Related OBD-II Codes
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What You Should Do
Have the catalytic converter and oxygen sensors inspected by a professional.
Check for diagnostic trouble codes (DTCs) related to catalyst efficiency or fuel trim.
If the converter is failing, replacement is typically required.
Also consider a fuel system cleaning and verifying fuel quality.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
