P0420 on HYUNDAI VELOSTER
What P0420 Means on Your HYUNDAI VELOSTER
Real HYUNDAI VELOSTER Owner Reports (Source: NHTSA Complaints Database)
"My car has code of p0420 catalyst system efficiency below threshold. the mechanic i have had look into the cause has suggested replacing the exhaust manifold catalytic converter assembly due to catalytic converter failure. it's a 2012 hyundai veloster 1."
"The 2013 hyundai veloster i purchased has had an issue where the car emits a sulfur like smell when accelerating. the safety risk is a faulty engine, and possible exposure to dangerous emissions. upon seeing the check engine light appear, i took it to the hyundai dealer for a diagnostic."
"I have a Hyundai Veloster 2015 base (dual-clutch transmission) that has 152,000 miles. I’ve regularly kept up with maintenance. Fully synthetic oil changed every ~5k miles. About a month ago it got a brand new battery and a new alternator. I have some issues related to the transmission."
"I am the second owner of a 2016 Hyundai Veloster Base, purchased used at approximately 19,976 miles. Since then, the vehicle has experienced multiple major powertrain-related failures. At 49,196 miles, the first catalytic converter failed and was replaced."
Data from NHTSA Vehicle Complaints Database. All reports are filed by vehicle owners directly with the U.S. Department of Transportation.
Common Causes of P0420 on HYUNDAI VELOSTER
Percentages based on NHTSA complaint component analysis for this vehicle.
Complaint Trend by Year
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if your vehicle is covered.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50-$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2-3 quotes. Dealer vs independent shop prices often differ 30-50% for the same repair.