Rotten Egg Smell During Acceleration
A rotten egg (sulfur) smell when accelerating in a 2020 Ford F-150 typically indicates a rich fuel mixture or a failing catalytic converter. The sulfur odor is caused by hydrogen sulfide in the exhaust, which is normally converted to odorless sulfur dioxide by a properly functioning catalytic converter. When the converter is overheated or contaminated, or when the engine runs too rich, this conversion fails, releasing the smell.
Diagnosis Details
Possible Causes
Failing or clogged catalytic converter – often due to age, contamination from oil or coolant, or an overly rich fuel mixture causing overheating.
Rich fuel mixture – caused by a faulty oxygen sensor, fuel injector leak, or mass airflow sensor issue, leading to unburned fuel in the exhaust.
Fuel contamination – bad gasoline with high sulfur content can produce the smell even with a healthy converter.
Related OBD-II Codes
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
What You Should Do
Have the vehicle inspected by a mechanic.
They should check for diagnostic trouble codes, test the catalytic converter efficiency, and examine oxygen sensor readings.
If the converter is failing, it must be replaced.
Also verify fuel quality and check for any engine misfire or rich condition.
Related Repairs
Share this diagnosis
Help others with similar symptoms
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.
