P0121 Code: 2022 Hyundai Kona – How to Fix It

What Does P0121 Mean on a 2022 Hyundai Kona?

Our diagnostic investigation into P0121 on your 2022 Hyundai Kona reveals the throttle position sensor (TPS) is transmitting voltage within the expected range but following an abnormal pattern. The ECM detects readings that don't match its calculations from pedal input, airflow, and engine load data.

The 2022 Kona (first generation) offers the 2.0L MPI four-cylinder (147 hp) or the 1.6L Turbo GDI (195 hp) in the N-Line. The MPI engine uses port injection for a cleaner throttle body; the turbo GDI uses direct injection and is more carbon-prone. Both pair with either a CVT or 7-speed DCT.

Common Symptoms to Watch For

• Check engine light on
• Hesitation during acceleration
• Rough or hunting idle
• CVT or DCT feels jerky
• Reduced throttle response
• Lower fuel economy

Top Causes Ranked by Likelihood

1. Carbon buildup on throttle body (30%) – At 2-4 years, early deposits are possible, especially on the GDI turbo. Cost: $120–$250.
2. Throttle body assembly failure (25%) – Internal TPS defect. Cost: $0 under warranty; $230–$420 otherwise.
3. ECM software calibration (25%) – An available update. Cost: $0 under warranty.
4. Wiring or connector issue (15%) – Corrosion or assembly variability. Cost: $0 under warranty; $80–$200 otherwise.
5. Intake system leak (5%) – A gasket or boot issue. Cost: $0 under warranty; $75–$225 otherwise.

How Serious Is This Code?

P0121 is medium severity. The Kona's small engines have limited reserves—throttle lag is very noticeable. Fix this soon.

Diagnostic Path

Your 2022 Kona is under Hyundai's warranty. Take it to the dealer for GDS diagnostics—free diagnosis and repair.

Can You Fix This Yourself?

Hyundai's 5yr/60k basic warranty covers your 2022 Kona. Original owners get 10yr/100k powertrain. Use warranty first. If out of warranty, throttle body cleaning is easy on both engines—the compact engine bay provides decent access from the top.

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