P0430 on the All-New 2024 Toyota 4Runner
A P0430 code on the redesigned 2024 Toyota 4Runner is unusual on a brand-new vehicle and should be addressed through the dealer. The 2024 4Runner features the new 2.4L T24A-FTS turbocharged four-cylinder engine producing 278 horsepower, or the i-FORCE MAX hybrid variant with 326 horsepower. This is a major change from the previous generation's 4.0L V6. The Bank 2 designation on this four-cylinder relates to the ECU's secondary catalyst monitoring point.
On a new vehicle with a new engine, this code is almost certainly a sensor defect, software issue, or manufacturing defect. It should be fully covered under warranty.
Symptoms You May Notice
- Check engine light on
- No significant drivability changes
- Possible slight fuel economy decrease
- Faint exhaust odor in rare cases
- Potential emissions test failure
Common Causes on the 2024 4Runner
- Defective O2 Sensor — Factory sensor defects are the most common trigger on new vehicles.
- First-Year Engine Calibration Issue — The 2024 4Runner is a ground-up redesign. ECU calibration updates for the new turbo engine are expected.
- Exhaust Assembly Defect — Improperly sealed connection or gasket from factory assembly.
- Catalytic Converter Defect — Extremely rare but covered under warranty.
Diagnosis and Repair
Go directly to your Toyota dealer. The 2024 4Runner is under full factory warranty and the federal emissions warranty. Do not attempt repairs yourself or clear the code. The dealer will use Techstream to diagnose, check for TSBs on the new platform, and perform repairs at no cost.
Cost Breakdown
- Warranty Repair — Cost: $0. Your only needed option on a 2024 model.
- O2 Sensor (theoretical) — $160 to $350 total out of warranty.
- ECU Reflash (theoretical) — $100 to $200.
- Catalytic Converter (theoretical) — $1,100 to $2,400 total.
DIY Feasibility
Do not attempt DIY on a brand-new vehicle under warranty. Let Toyota handle it. The new turbo engine has a more complex exhaust layout than the old V6, making professional service important.
Prevention Tips
- Follow the break-in procedure in the owner's manual
- Report warning lights to the dealer right away
- Use the recommended fuel grade for the turbo engine
- Keep all service records from day one
- Allow the engine to warm up before intense driving