P0100 on Your 2024 Toyota 4Runner
A P0100 code on your 2024 Toyota 4Runner indicates the ECM has detected a malfunction in the mass air flow (MAF) sensor circuit. The 2024 is the final year of the 5th-generation 4Runner with its proven 4.0L V6, and this code is uncommon on a newer vehicle.
Symptoms
- Check engine light on
- Rough or unstable idle
- Hesitation during acceleration
- Reduced power
- Poor fuel economy
- Possible stalling
Likely Causes
- MAF sensor connector issue (28%) — Connection vibrated loose, especially with off-road use.
- Contaminated MAF sensor (28%) — Dust or debris from off-road or work conditions.
- Faulty MAF sensor (18%) — Factory-defective or early-failure sensor.
- Intake air leak (13%) — Loose clamp or boot.
- Air filter contamination (8%) — If an oiled aftermarket filter was installed.
- Wiring issue (5%) — Defect or damage.
What to Do
- Toyota dealer visit — Fully covered warranty work.
- Note driving conditions — Document if off-road use preceded the code.
- Don't clear the code — Dealer needs freeze frame data.
Repair Costs
- Under warranty: $0—covered under Toyota's 3-year/36,000-mile warranty through 2027
Warranty
Your 2024 4Runner is fully covered under Toyota's 3-year/36,000-mile warranty through 2027 and the federal emissions warranty for 8 years/80,000 miles through 2032.