How to Make Sure a Used Engine Fits Your Car Before You Buy

Ordering the wrong engine is expensive. You pay freight twice and lose shop time, and the car sits on jack stands longer. Most mistakes happen because the buyer matched the engine code and stopped there. Here's what we check before a unit ships, and what you should check too.

1. Start with your VIN

Your VIN tells you the exact model year, trim and usually the engine your car was built with. Don't go by what someone told you or what's written on the valve cover sticker. Send us the VIN and we'll check it against the unit you're looking at.

2. Match the engine code, then keep going

An engine code like 2AZ, K24 or FB25 tells you the engine family. It doesn't tell you the whole story. Many families come in several versions built for different vehicles and years. They can differ in:

• Mount positions: two engines with the same code can have mounts in different places, especially on the timing side. If the mounts don't line up, the engine won't bolt in.
• Model years: manufacturers update engines mid-generation, so an engine for one year isn't automatically right for another.
• Sensors and wiring: connectors, sensor locations and electronics change between versions.
• Intake and accessories: manifolds, brackets and accessory drives can differ.

3. Check the drivetrain

2WD, 4WD, AWD and RWD versions of the same engine often use different oil pans, mounts or accessories. For transmissions it matters even more, because an AWD transmission won't go into a 2WD car. Every one of our transmission listings states its drivetrain.

4. Match the transmission type

If you're replacing a transmission, match automatic vs. manual, the number of speeds and the transmission code. If you're buying an engine, make sure it will mate to your existing transmission.

5. Know what's included

A complete engine and a long block are not the same thing. Complete engines often come with parts like the intake manifold, injectors, coils and alternator. Long blocks don't. Check the listing and the photos, and plan to transfer any parts you need from your old engine.

6. Read the listing's years and models

Every listing on our site states the years and models that unit is listed for. If your car isn't on that list, ask before you buy. Don't assume.

We'll check it for you

Call (973) 969-5190 or send your VIN through our contact page, and we'll confirm the match before you order. Browse all JDM engines or all JDM transmissions.