Rotten Egg Smell During Acceleration
A rotten egg smell when accelerating in a 2019 Nissan Altima is typically caused by a failing catalytic converter that is not properly converting hydrogen sulfide in the exhaust. This can also be due to a rich fuel mixture or contaminated fuel.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal sulfur compounds are not being converted, producing hydrogen sulfide (rotten egg smell) under load.
Rich fuel mixture – excess unburned fuel can overload the catalytic converter, causing it to overheat and emit sulfur odors.
Contaminated or low-quality fuel – high sulfur content in fuel can produce the smell, especially during hard acceleration.
Related OBD-II Codes
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What You Should Do
Have the exhaust system inspected, focusing on the catalytic converter and oxygen sensors.
Check for any stored diagnostic trouble codes.
If the converter is failing, it will need replacement.
Also consider using a different fuel brand or adding a fuel system cleaner.
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.
