2014 Hyundai Sonata: Engine knock
Common wear/failure (not a recall)
Symptoms
Owners of the 2014 Sonata report: engine knock. CarComplaints.com lists 9 owner complaints, average mileage 50,200 miles.
NHTSA has 323 owner complaints for the 2014 Sonata in this area. Examples:
- NHTSA complaint ODI #11771514 (filed 10/15/2026): “Summary of event: this vehicle was brought to an authorized hyundai dealership for a mandatory safety recall engine replacement under the theta ii engine recall campaign. the dealership successfully installed a replacement engine provided by the manufacturer. …”
- NHTSA complaint ODI #11769189 (filed 10/05/2026): “I was driving on the freeway about 100 miles outside of boise, id when the vehicle went into limp mode and a flashing check engine light came on. i had it towed to the hyundai dealership in boise where they ran a diagnostic check and it came back with a p1326 …”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: engine replaced with a long block (2 reports) knock sensor replaced (1 reports) replace engine (1 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range: get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .