P0420 on KIA FORTE
What P0420 Means on Your KIA FORTE
Real KIA FORTE Owner Reports (Source: NHTSA Complaints Database)
"Repeated engine failure. 10/1/2022 "internal problem required engine teardown found exhaust cvvt dowel pin had sheared off inside of exhaust camshaft causing excessive play. Replaced exhaust cvvt exhaust camshaft valve cover gasket rtv exhaust cvvt bolt timing chain tensioner timing chain and ocv."
"I own a 2020 Kia Forte LXS with approximately 136,000 miles. The check engine light came on with code P0420 (“catalyst system efficiency below threshold”), and an Express Oil Change & Tire Engineers location confirmed the catalytic converter is failing."
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 KIA FORTE
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.