Data readout · NHTSA ODI + US sales

Toyota check engine light by model, per 100k sold

We took 21,481 Toyota owner complaints filed with the NHTSA (2012–2023), and for the 914 that mention a check engine light, divided by how many of each model were sold. Per vehicle, the Tundra leads at 7.88 per 100,000 — the 4Runner is lowest at 1.48.

What the data shows

By raw complaint share, the Tacoma looks worst: 8.7% of its complaints mention a check engine light. Divide by units actually sold and the order changes. The Tundra moves into first at 7.88 complaints per 100,000 sold. It sells in far smaller numbers, so the same complaint volume carries more weight per truck on the road. The bigger surprise is the Highlander: high sales volume buried its rate in the raw count, and per vehicle sold it comes in second at 6.88, just ahead of the Tacoma's 6.73.

The ranking flips the other way for high-volume models. Corolla (2.50 per 100,000) and Camry (4.19) both sit well below the trucks, and the 4Runner comes in lowest of all at 1.48. The top of the list is still trucks and the Highlander, a big-vehicle story overall. What changes is the middle: the fair per-vehicle count rewards the models Toyota sells the most, rather than letting raw volume hide them. The failure pattern by system holds too. Trucks skew toward engine complaints; cars and car-based SUVs lean power-train and electrical. That tracks with the Tacoma TRAC OFF + check-engine cluster and the broader Toyota TRAC OFF picture.

How we measured this

Numerator: the public NHTSA Office of Defects Investigation (ODI) complaints database via api.nhtsa.gov, model years 2012–2023. NHTSA files some model years under more than one name, so we pulled every name it uses for each model year and removed duplicates by ODI number. Model and year come from each complaint's own vehicle record, because a query for one model also returns some complaints about another (a Prius query returns Prius v and Prius c complaints, for example). Camry includes the Hybrid and the "Camry HV" records (where most 2014 Camry complaints sit), Highlander the Hybrid and "Highlander HV", RAV4 the Hybrid, Prime and EV, Corolla the Hybrid and Hatchback, Tundra the Hybrid, and Sienna the Sienna Hybrid and the 2021–2022 vans NHTSA lists as "redundant SIENNA". The Prius is the liftback only, matching its sales figure. For each model we counted the complaints whose summary text mentions a check engine light (or "engine light", "MIL", "malfunction indicator") — 914 in total. Denominator: US sales for the same 2012–2023 span, cross-checked across two independent sources (goodcarbadcar.net and carfigures.com, which agree to within rounding); the Prius figure is the liftback only, matching the complaint model. The per-100k rate is CEL complaints ÷ vehicles sold × 100,000 — a per-vehicle figure NHTSA does not publish, since it releases raw complaint counts only. "Top system" is the most-cited NHTSA component category among a model's CEL complaints.

Read this honestly: complaints are self-reported to NHTSA, so this counts reported check-engine complaints, not every fault. Sales are a proxy for vehicles on the road — older model years have since left the fleet, which the count doesn't adjust for. And the complaint window is model-year while sales are calendar-year over the same span, so the two align closely but not exactly. Treat the per-100k rate as a fair comparison across the lineup, not an absolute "model X breaks Y% of the time".

Complaints pulled 2026-10-17 (first published from a June 30, 2026 pull that queried only each model's base name and missed the records listed above; corrected October 17, 2026); sales added 2026-07-22. NHTSA Office of Defects Investigation (ODI) complaints, api.nhtsa.gov; US sales via goodcarbadcar.net + carfigures.com. Independent reference, not affiliated with NHTSA or Toyota.