Rotten Egg Smell During Acceleration
A rotten egg smell (sulfur odor) when accelerating in a 2020 Toyota RAV4 typically indicates a failing catalytic converter or a rich fuel mixture causing sulfur buildup. This can also be related to a malfunctioning oxygen sensor or fuel system issue.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal sulfur compounds are not being converted properly, releasing hydrogen sulfide gas.
Rich fuel mixture – excessive fuel in the exhaust can cause sulfur to form in the catalytic converter.
Faulty oxygen sensor – incorrect readings can cause the engine to run rich, leading to sulfur smell.
Fuel quality issues – high sulfur content in gasoline can produce the odor.
Related OBD-II Codes
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What You Should Do
Have the catalytic converter and oxygen sensors inspected.
A diagnostic scan can check for trouble codes.
If the converter is failing, it may need replacement.
Also check for any fuel system issues or vacuum leaks.
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.
