Where do I find the engine ID number?
The engine ID number (engine serial number) is usually stamped into the engine block or displayed on a small metal tag. Exact locations vary by make and model, so check the engine bay and your owner's manual. This article outlines common spots and how to use the ID effectively.
What the engine ID number is
The engine ID number is a unique serial associated with a specific engine. It is not the vehicle Identification Number (VIN), which identifies the whole car, but it may be required when ordering parts, checking recalls, or servicing the engine. Some manufacturers also call this an engine code or serial plate.
VIN vs. engine ID
The VIN identifies the vehicle as a whole, including year, make, model, and production sequence. The engine ID pinpoints the exact engine installed in that vehicle and is often used for parts compatibility and warranty records. Availability and placement of the engine ID can differ between brands and regions.
Where to look on a car engine
Car engines commonly carry the ID number in a few standard places. Start with the most accessible locations and move to less obvious spots if you don’t see a number right away.
- Stamped into a machined pad on the engine block, often on the driver’s side or near the timing cover, oil filter, or exhaust manifold area. The characters are usually raised and may be small.
- On a metal tag or plate attached to the engine, sometimes secured to the valve cover, timing cover, or near the intake manifold.
- On an engine data plate behind the radiator support or on a firewall-side area of the engine bay, depending on the chassis and model.
- On the engine cover or a visible label in newer designs, especially where the block itself isn’t easily accessible.
If you can’t locate it, consult your owner's manual, service manual, or contact a dealership with your VIN for exact guidance on your specific model. A shop may also help you locate the ID using service diagrams for your engine family.
Where to look on motorcycles, boats, and other engines
Engine IDs outside cars are common too, but the placement varies by device. Here are typical spots for other popular engine types.
Motorcycles and scooters
- Stamped into the engine crankcase, usually on the left side near the clutch cover or alternator. It can be on a machined pad or cast into the engine casing.
For motorcycles, the ID is often near the engine’s base or side case, and may be accompanied by a separate model code or production date.
Boats, marine engines, and outboards
- Engine serial numbers are typically on a tag attached to the engine block or transom bracket, or stamped on the cylinder block. Some models place the tag on the valve cover or near the propeller housing.
Marine engines and outboards sometimes require checking both the engine and the boat’s documentation to confirm the exact serial location and format.
Generators and stationary engines
- Serial numbers are usually on the generator housing or a data plate near the control panel or exhaust area. Some units stamp the number directly on the engine block.
When in doubt, refer to the equipment manual or contact the manufacturer with the model name and serial to identify the precise location.
How to locate and record the engine ID
Once you find the engine ID, capture it clearly and keep it handy for service, parts, and recalls. Follow these steps to ensure you have a reliable record.
- Locate the ID as described for your engine type and model.
- Photograph the area around the ID and the exact characters for reference.
- Note the exact sequence of letters and numbers, including any dashes or prefixes.
- Cross-check the ID with your vehicle or engine manual to confirm the correct format.
- Share the ID with your dealer or parts supplier when ordering parts or requesting recalls, and store it in a safe location.
Having the engine ID handy helps ensure you get the correct parts and accurate service history, especially for engine-specific recalls or updates.
Summary
In most vehicles, the engine ID number is stamped on the engine block or shown on a small metal tag, with exact placement varying by maker and model. If you’re unsure, start with the owner’s manual or consult a dealer or mechanic. For non-car engines, check the crankcase, engine tag, or housing area, as locations differ by device. Keeping a record of the engine ID makes parts orders, recalls, and service faster and more reliable.
