Rotten Egg Smell When Accelerating
A rotten egg (sulfur) smell during acceleration in a 2019 Honda Accord typically indicates a failing catalytic converter or a rich fuel mixture causing excess sulfur in the exhaust. This can also be caused by a malfunctioning oxygen sensor or fuel system issue.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal damage or clogging prevents proper conversion of sulfur compounds.
Rich fuel mixture – faulty oxygen sensor, fuel injector, or mass airflow sensor causing unburned fuel to reach the catalytic converter.
Fuel contamination – bad gasoline with high sulfur content.
Related OBD-II Codes
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What You Should Do
Have the catalytic converter and oxygen sensors inspected by a professional mechanic.
A diagnostic scan can check for trouble codes.
If the converter is failing, replacement is necessary.
Also consider a fuel system cleaning and using top-tier gasoline.
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.
