Drop in Fuel Economy – Hyundai Elantra 2019
A recent drop in fuel economy in a 2019 Hyundai Elantra can be caused by several factors, ranging from simple maintenance issues to more complex engine or sensor problems. Common causes include underinflated tires, dirty air filter, faulty oxygen sensor, or a clogged fuel injector.
Diagnosis Details
Possible Causes
Underinflated tires or improper tire pressure
Dirty or clogged engine air filter
Faulty oxygen sensor (O2 sensor) causing rich fuel mixture
Clogged fuel injectors or fuel system issue
Mass airflow (MAF) sensor malfunction
Related OBD-II Codes
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What You Should Do
Check and adjust tire pressures to recommended levels.
Inspect and replace engine air filter if dirty.
If problem persists, have a mechanic scan for diagnostic trouble codes (DTCs) and test oxygen sensor, MAF sensor, and fuel system.
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.
