Data readout · NHTSA ODI + US sales

Toyota check engine light by model, per 100k sold

We took 19,782 Toyota owner complaints filed with the NHTSA (2012–2023), and for the 852 that mention a check engine light, divided by how many of each model were sold. Per vehicle, the Tundra leads at 7.35 per 100,000 — the 4Runner is lowest at 1.40.

#	Model	CEL per 100k sold	CEL / sold	Top system
1	Tundra	7.35	98 / 1.33M	Engine (38)
2	Tacoma	6.57	161 / 2.45M	Engine (60)
3	Highlander	6.19	143 / 2.31M	Power train (41)
4	Camry	3.73	161 / 4.32M	Power train (45)
5	Prius	2.85	41 / 1.44M	Engine (9)
6	RAV4	2.75	117 / 4.25M	Electrical (33)
7	Sienna	2.56	26 / 1.02M	Power train (10)
8	Corolla	2.47	87 / 3.53M	Power train (24)
9	4Runner	1.40	18 / 1.29M	Electrical (8)

What the data shows

By raw complaint share, the Tacoma looked worst: 8.8% of its complaints mentioned a check engine light. Divide by units actually sold and the order changes. The Tundra moves into first at 7.35 complaints per 100,000 sold, just ahead of the Tacoma's 6.57. It just 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 true rate in the raw count, and per vehicle sold it jumps to 6.19, a close third behind both trucks.

The ranking flips the other way for high-volume models. Corolla (2.47 per 100,000) and Camry (3.73) both slide well down the list, and the 4Runner comes in lowest of all at 1.40. 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. For each model we counted the complaints whose summary text mentions a check engine light (or "engine light", "MIL", "malfunction indicator") — 852 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 2026-06-30; 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.