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Kia Engine Failures in the NHTSA Data: a 14-Year Tally

Kia's engine story has a before and an after, and I wanted to see it in numbers instead of forum anger. So I pulled every complaint NHTSA has on file for twelve Kias — model years 2011 to 2024, 28,479 complaints in all — and tallied the ones that read like an engine dying: knocking, seizing, stalling, "engine replaced." This page is that notebook tally, with the raw data and my exact search terms attached.

The tally, ranked

Two things jump out of that list, and only one of them is the one everybody expects. Yes, the recall-era trio runs hot — as a group, 30.3% of their 16,671 complaints read like engine failure, against 27.4% for the rest of the lineup. But the Soul, which never wore a Theta II, sits right up there at 36.2%, and the Seltos tops the whole table on a pool of just 490 complaints. Ranking by share keeps the big sellers from hogging the top — the volume caveat cuts the other way too, and small pools swing hard.

Before and after: the recall-era trio

This split is the cleanest Theta II evidence in the whole pull. Sportage complaints describing engine failure fall by more than half once the Theta II years end, and the Sorento drops hard too. The Optima looks like it goes the other way — but its late column is a single model year and 136 complaints, because the Optima became the K5 after 2020. I'd call that column noise; the K5's own row (9.7%) tells the quieter story.

What I'd do with this

If you own one of the shaded rows, don't skim this page and start pricing engines. Run your VIN through NHTSA's recall lookup first — the Theta II work, where it applies, is free, and so is the knock-sensor update. A check engine light plus a knock or sudden power loss is the one combination where I'd park the car and make it Kia's problem, not mine.

For everything else, the boring advice survives contact with the data: most lights are still gas caps, sensors and coils, so pull the code before you authorize anything, treat a flashing light as its own emergency lane, and only reset the light after the cause is actually fixed — on these engines especially, that blinking lamp may be the early-warning system doing its job.

The model notebook

The paper trail

• NHTSA's consent order (November 2020) put Kia under a $70 million civil penalty — $27M upfront, $16M on safety performance measures, $27M deferred — over untimely Theta II engine recalls; combined with Hyundai's, $210 million — NHTSA press release
• The Theta II class action (final approval May 2021) turned the powertrain warranty into a lifetime warranty on the engine short block for 2011–2019 Optima, Sorento and Sportage owners — conditional on getting the KSDS update installed — Kia Engine Settlement, official site
• Kia's KSDS campaign (January 2019) pushed knock-sensor software to 1,677,640 Optimas, Sorentos and Sportages; when it detects bearing-wear vibration the check-engine lamp blinks continuously, the car drops into limp mode, and code P1326 is stored — Kia Motors America media statement (PDF)
• Recall 17V-224 (2017) covered 618,160 Optima, Sorento and Sportage vehicles for crankshaft machining debris that can starve the rod bearings of oil — knock first, seizure if you keep driving — Kia Part 573 Safety Recall Report to NHTSA (PDF)

Clip-out stats

• 28,479 NHTSA complaints tallied across twelve Kia models, model years 2011–2024 — 156 recall campaigns, 48 engine-related.
• Sportage complaints describing engine failure: 42.2% in 2011–2019 → 18.2% in 2020–2024.
• The recall-era trio: 30.3% of 16,671 complaints read like engine failure, vs 27.4% for the rest of the lineup.
• The quiet surprise: the never-recalled Soul logs 36.2% engine-failure mentions across 5,285 complaints.