Rotten Egg Smell During Acceleration
A rotten egg smell (sulfur odor) when accelerating in a 2020 Jeep Grand Cherokee typically indicates a failing catalytic converter or a rich fuel mixture causing excess sulfur in the exhaust. The catalytic converter is supposed to convert hydrogen sulfide into odorless sulfur dioxide, but when it malfunctions or the engine runs rich, the smell becomes noticeable.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal damage or contamination prevents proper conversion of sulfur compounds.
Rich fuel mixture (e.g., faulty oxygen sensor, fuel injector leak, or mass airflow sensor issue) causing unburned fuel and sulfur to reach the converter.
Low-quality fuel with high sulfur content – less common but can cause temporary odor.
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 needed.
Also consider using top-tier fuel and checking for engine performance issues.
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.
