

Air bag warning labels, required by the U.S. National Highway Traffic Safety Administration (NHTSA), are attached to alert the driver and passengers of potential risks of the air bag system. Be sure to read all of the information about the air bags that are installed on your vehicle in this Owners Manual.
Additional Safety PrecautionsHyundai Elantra AD (2016-2020) Service Manual: Troubleshooting
Troubleshooting
SymptionSuspect areaRemedyEngine misfire with abnormal internal lower engine noises
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Worn crankshaft bearings
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Loose or out of specification engine flywheel
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Replace the crankshaft and bearings as required.
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Repair or replace the flywheel as req ...
Hyundai Elantra AD (2016-2020) Service Manual: Troubleshooting
Standard Flow of Diagnostic Troubleshooting
Notes With Regard To Diagnosis
The phenomena listed in the following table are not abnormal.
ConditionExplanationSystem check soundWhen starting the engine, a thudding sound can sometimes be heard coming from inside the engine compartment. This is bec ...