Data readout · NHTSA ODI

Toyota check engine light by model

We pulled 19,782 Toyota owner complaints filed with the NHTSA (2012–2023, 9 models) and counted how many mention a check engine light. It's a truck story: the Tacoma leads at 8.8% — roughly 4× the Prius and Sienna.

#	Model	CEL-mention rate	CEL / total	Top system
1	Tacoma	8.8%	161 / 1,837	Engine (60)
2	Tundra	6.2%	98 / 1,588	Engine (38)
3	Camry	5.1%	161 / 3,182	Power train (45)
4	Highlander	4.9%	143 / 2,941	Power train (41)
5	Corolla	3.5%	87 / 2,509	Power train (24)
6	RAV4	2.9%	117 / 4,006	Electrical (33)
7	4Runner	2.7%	18 / 660	Electrical (8)
8	Prius	2.2%	41 / 1,869	Engine (9)
9	Sienna	2.2%	26 / 1,190	Power train (10)

What the data shows

Toyota's trucks lead the pack. The Tacoma (8.8%) and Tundra (6.2%) are far more likely to have a complaint that mentions a check engine light than the cars and hybrids — the Prius and Sienna sit at just 2.2%. And the trucks fail differently: their CEL complaints are dominated by engine and fuel-system issues, while the Camry, Highlander and Corolla lean toward power-train and electrical. That tracks with what we see in the Tacoma TRAC OFF + check-engine cluster (secondary-air-injection codes like P2440), and with the broader Toyota TRAC OFF picture.

How we measured this

Source: the public NHTSA Office of Defects Investigation (ODI) complaints database via api.nhtsa.gov, model years 2012–2023. For each model we counted every complaint, then the subset whose summary text mentions a check engine light (or "engine light", "MIL", "malfunction indicator"). The CEL-mention rate is that subset divided by the model's total complaints; "top system" is the most-cited NHTSA component category among those CEL complaints.

Read this honestly: the mention rate is a share of complaints, not a per-vehicle failure rate. Raw complaint volume tracks how many of each model are on the road, and drivers self-select what they report. Treat it as where check-engine chatter concentrates across Toyota's lineup — not as "model X breaks Y% of the time".

Data pulled 2026-06-30 · NHTSA Office of Defects Investigation (ODI) complaints, api.nhtsa.gov. Independent reference, not affiliated with NHTSA or Toyota.