Before you commit to a JDM engine purchase, running through this checklist can save you from a costly mismatch or a bad deal. This post is part of our complete guide to JDM engines.
1. Is this the exact engine code my car (or swap) needs?
Confirm the full code, not just the family — see JDM engine codes explained. A vague answer here, or a seller who only knows the family name and not the exact suffix, is a reason to keep looking.
2. What's the documented mileage, and where does that figure come from?
A trustworthy seller can explain how the mileage was recorded. See what "low-mileage" really means.
3. Is the transmission included, and is it manual or automatic?
Confirm this explicitly — don't assume based on the listing photo alone, since photos aren't always updated per unit.
4. Is the wiring harness and ECU included, or sold separately?
This materially affects both price and how straightforward your installation will be. A "complete" listing should specify exactly what's in the box.
5. What warranty is offered, and what specifically does it cover?
Get this in writing before you pay. See our warranty guide for what a solid policy should include.
6. How was the engine sourced and inspected?
A seller who can describe their sourcing process in specific terms (not just "imported from Japan") is generally more trustworthy. See how JDM engines are sourced from Japan.
7. Does the price reflect the code's rarity and what's included?
Compare against real current market ranges in our cost guide — an unusually low price with no clear explanation is a reason for caution, not celebration.
8. What's the shipping timeline, and is freight included in the price?
Engines are heavy and freight costs can be significant — confirm this is either included or clearly quoted before you commit.
9. Is there a return or replacement process if the engine doesn't perform as described?
Ask specifically what happens if the engine arrives damaged or turns out not to match the listing.
10. Does the seller have a track record you can verify?
Look for reviews, a real physical presence, and a seller who's been reachable and responsive throughout your questions — not just at the point of sale.
What a good answer sounds like vs. a red flag
| Question | Good answer | Red flag |
|---|---|---|
| Engine code | States the full code, e.g. "K24A2" | Only knows the family, e.g. "it's a K-series" |
| Mileage source | "Recorded at export, documented in our records" | "Trust me, it's low" |
| Warranty | Specific written terms, length, and process | "Fully guaranteed" with no details |
| Return policy | Clear steps and timeframe | "We don't really do returns on engines" |
Putting it all together
None of these questions individually guarantees a good purchase, but a seller who answers all ten clearly, specifically, and in writing is a much safer bet than one who's vague on even one or two. If you're still narrowing down which engine you need in the first place, start with our guide on how to choose the right JDM engine.
Buy from a seller who answers all ten clearly
At JDM New York, every engine is hand-selected in Japan and backed by our warranty, with fast nationwide shipping. Browse our current JDM engines for sale by make, model, or engine code.