Collection: Used Kia Engines For Sale

Browse Kia Engines by Year

Pick your model year for VIN-matched 2018 or 2017 inventory. More year pages coming online weekly — if your year is not yet linked, text us your VIN and we will match you.

Kia Engines We Cover

Real engines from our warehouse, tested and ready to ship. Our Kia inventory spans every major engine family Kia has produced for the U.S. market.

Lambda 3.5L V6 (Workhorse)

Telluride, Sorento, Sedona, K900 (2010+). The volume Kia V6 — dual VVT, 60-degree architecture. Highest demand for Telluride and Sorento applications.

Theta II 2.4L Inline-Four (NA)

Optima, Sorento, Sportage (2011–2018). Aluminum block, GDI direct injection. Subject to HMG rod-bearing class action — we inspect every unit and verify KSDS update status.

Theta II 2.0T Turbo Inline-Four

Optima SX, Sorento SX, Stinger 2.0T, older Optima Hybrid variants (2011–2020). Twin-scroll turbo, GDI. Same rod-bearing service history applies — we verify each unit.

Lambda II 3.3T Twin-Turbo V6 (Stinger GT)

Stinger GT, K900 3.3T (2017–2022). Performance V6 with twin turbos and GDI — 365 hp. Same architecture as Genesis G70/G80 3.3T Sport.

Gamma 1.6T GDI Turbo Inline-Four

Soul Turbo, Forte GT, K5 GT-Line, Seltos SX Turbo (2014+). Compact twin-scroll turbo four with GDI. Tested and warrantied.

Gamma 1.6L MPI Inline-Four (NA)

Rio, Soul base, Forte base (2011+). Multi-port-injection economy four — simple, MPI (not GDI) means no carbon-buildup issue. Tested and warrantied.

Nu 2.0L GDI Inline-Four

Forte 2.0, Soul 2.0, Sportage 2.0L (2011+). GDI direct injection, mid-size four-cylinder. Tested and warrantied.

Smartstream 2.5T Turbo Inline-Four

K5 GT, Sorento X-Line 2.5T, Stinger 2.5T (2020+). Theta II successor — twin-scroll turbo with dual (port + direct) injection resolves GDI carbon issue. NOT a Theta II replacement part.

Smartstream 1.6T Hybrid Inline-Four

Sorento Hybrid, Sportage Hybrid, Niro (2021+). Turbocharged hybrid — tied to year-specific motor and transmission. Must match donor year exactly.

Tau 5.0L V8 (Rare — K900)

Older K900 5.0 V8 (2015–2017). Kia's only V8, shared with Genesis G90 5.0 — low production volume, specialist sourcing. Tested and warrantied.

Kappa 1.6L Hybrid Inline-Four

Niro Hybrid, older Optima Hybrid, older Soul mild-hybrid (2017–2022). Atkinson-cycle hybrid four — hybrid system pairing must match donor year.

More Kia Engines

Plus Kappa 1.4L, Gamma 1.6L GDI, older Sigma 3.3 V6 (Sedona / Amanti) — text us your VIN.

Trustpilot

Why Buy a Used Kia Engine from Auto Power Source

Kia's engine catalog is shared with sister-brand Hyundai across the entire Hyundai Motor Group (HMG) lineup — the 2.4L Theta II in a 2015 Optima is the same long-block as the one in a 2015 Hyundai Sonata, and the 3.5L Lambda in a Telluride shares architecture with the Hyundai Palisade. That cross-brand sharing is great for parts and price, but Kia owners share the same known issues: the Theta II 2.0T and 2.4L GDI rod-bearing recall/class-action (spanning roughly 2011–2018 model years) is the single biggest thing to verify on any Theta II purchase. The post-2020 Smartstream 2.5T is architecturally different from the Theta II 2.0T it replaced — not a drop-in.

Our 400+ Kia engines all come from low-mileage donor vehicles, cataloged by VIN, and held in our climate-controlled warehouse pending sale. Each unit clears our six-step process: VIN-matched to donor and target, ASE-certified compression test on every cylinder, leak-down evaluation, run-stand noise & smoke verification, full visual inspection, multi-angle photographs sent for your approval, and palletized freight shipping. Every Theta II 2.0T and 2.4L GDI unit gets an extra rod-bearing inspection and we verify the Knock Sensor Detection System (KSDS) software update status against the donor VIN.

You pay a fraction of dealer-new pricing for identical HMG engineering, ship free on a heavy-duty pallet to any address in the continental U.S., and you have 30 days from delivery to return for any reason — no restocking fees, no return freight charges. Up to a 3-year warranty covers you after install, and our six-step inspection has held our fitment-related return rate at 0% across 100,000+ Engines+Transmissions In Stock.

Your Kia Engine Options: Compared

Most Kia owners face four real choices when their engine fails:

Tested used OEM hits the sweet spot — same engineering as new, fraction of the cost.

Kia Engine Buying Guide

Five things to verify before buying a used Kia engine:

1. Theta II 2.0T & 2.4L GDI: verify KSDS status and rod-bearing history. The Theta II family (Optima, Sorento, Sportage — roughly 2011–2018) is subject to a long-running rod-bearing class action. Kia and Hyundai issued a Knock Sensor Detection System (KSDS) software update and extended powertrain warranty on affected units. Always verify the donor VIN's KSDS update status and any prior engine-replacement history before purchase.
2. Theta II 2.0T vs Smartstream 2.5T: NOT interchangeable. The Smartstream 2.5T (2020+ K5 GT, Sorento X-Line, Stinger 2.5T) replaced the Theta II 2.0T in these applications but is a fundamentally different engine — dual injection (port + direct) instead of GDI-only, redesigned block, different accessory drive. Do not order a Theta II 2.0T thinking it will bolt into a 2021+ K5 GT.
3. Lambda II 3.3T Twin-Turbo requires HPFP and turbo verification. The 3.3T (Stinger GT, K900 3.3T) is a strong performer but the high-pressure fuel pump and twin turbos are wear items on high-mileage donors. We inspect both on every unit — ask for the report before purchase.
4. GDI carbon buildup is expected on high-mileage Nu 2.0, Gamma 1.6T, and Lambda 3.3T. All GDI Kia engines (2011+ Nu 2.0L, 2014+ Gamma 1.6T, all Lambda II 3.3T) accumulate intake-valve carbon over 80–100K miles. This is not a defect and doesn't affect long-block condition, but it should be walnut-blasted at install for best result. We disclose donor mileage so you can plan accordingly.
5. Hybrid engines (Kappa 1.6L, Smartstream 1.6T Hybrid) are tied to year-specific hybrid hardware. Niro Hybrid, Sorento Hybrid, Sportage Hybrid, older Optima Hybrid — the gas engine, motor-generator, inverter, and transmission are all matched by model year and cannot be mixed. Confirm your donor year matches your vehicle exactly, or plan to swap the hybrid system as a set.

Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.

Learn More: Kia Engine Guides

Practical guides from our team — how to install a used Kia engine, what to check on delivery, and what really matters when buying online.

APS Preinstallation Guide

Step-by-step guide to properly installing a used engine — what to inspect, prep, and torque before first start.

Post-Install Maintenance Checklist

Keep your used engine running like new — the break-in period, oil intervals, and warning signs to watch for.

5 Things to Know Before Buying

Warranty terms, VIN matching, mileage, testing, return policy — the checklist every buyer should run through.

After Delivery: Inspection Guide

What to check the moment your engine arrives — freight damage, matching numbers, and what to photograph.

Frequently Asked Questions

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