Common Hyundai OBD Codes
Hyundai vehicles commonly trigger catalytic converter efficiency codes, misfire codes, and purge valve issues. The Theta II engines have known oil consumption problems that can lead to knock sensor and misfire codes over time.
Most Common Hyundai Diagnostic Codes
Catalyst System Efficiency Below Threshold
Typical cost: $200 - $2500
Random/Multiple Cylinder Misfire Detected
Typical cost: $100 - $2500
System Too Lean (Bank 1)
Typical cost: $75 - $1200
Evaporative Emission Control System Leak Detected (Gross Leak)
Typical cost: $15 - $500
Evaporative Emission Control System Leak Detected (Small Leak)
Typical cost: $20 - $600
Coolant Thermostat Below Thermostat Regulating Temperature
Typical cost: $50 - $400
Knock Sensor 1 Circuit Malfunction
Typical cost: $50 - $500
Idle Control System RPM Higher Than Expected
Typical cost: $30 - $400
Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 2)
Typical cost: $100 - $350
Intake Camshaft Position Timing Over-Advanced (Bank 1)
Typical cost: $50 - $2000
Popular Hyundai Models
The codes listed above are commonly reported across these Hyundai models. Actual codes may vary by model year and engine type.
Recent Hyundai Recalls
2 Active Recalls — 2026 Hyundai Tucson
The following NHTSA safety recalls have been issued for this vehicle. Contact your dealer to check if your vehicle is affected.
ENGINE AND ENGINE COOLING:CRITICAL FASTENERS
Hyundai Motor America (Hyundai) is recalling certain 2025-2026 Tucson and Santa Fe vehicles. The connecting rod bolts in the engine may have been improperly tightened, which can cause a loss of drive power and engine damage, possibly resulting in an oil leak.
Remedy: Dealers will replace the engine, free of charge. Owner notification letters were mailed October 23, 2025. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 281.
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Hyundai Motor America (Hyundai) is recalling certain 2025-2026 Tucson Hybrid, Tucson Plug-In Hybrid Electric (PHEV), 2026 IONIQ 5, Santa Cruz, Kona, Palisade, Palisade Hybrid, Santa Fe, Santa Fe Hybrid, Sonata, Sonata Hybrid, and Tucson vehicles. Due to a software error, the instrument panel display may fail. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 101, "Controls and Displays."
Remedy: The instrument panel display software will be updated over-the-air (OTA) or by a dealer, free of charge. Owner notification letters are expected to be mailed March 27, 2026. Owners may contact Hyundai's customer service at 855-371-9460. Hyundai's number for this recall is 293. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on January 28, 2026.
Data provided by the National Highway Traffic Safety Administration (NHTSA).
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