Where to Find the Engine Number and Chassis Number of a Motor Vehicle?

[OMaya]

The engine number is generally located on the outer surface of the engine block, on the vehicle's nameplate, or on the nameplate inside the engine compartment. The simplest and most direct method is to check the vehicle's administrative green book or the vehicle's registration certificate. The engine number is like a person's ID number, representing each vehicle. It contains very important information about the vehicle. The chassis number is stamped on the vehicle's frame. The specific location varies by manufacturer, so you can refer to your vehicle's manual. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, industry or company practices, and the attributes of the engine. It represents information such as the manufacturer, specifications, performance, features, technology, purpose, and production batch of the engine, including fuel type, number of cylinders, displacement, and static braking power. Engines installed in passenger cars or multi-purpose vehicles are required to display the professional manufacturer, model, and production number. The chassis number is a commonly used term, with the professional term being the Vehicle Identification Number (VIN). It is a unique code assigned by the manufacturer to identify a vehicle. The VIN consists of 17 alphanumeric characters and is also known as the 17-digit identification code, chassis number, or 17-digit number. The combination of the vehicle identification code ensures that no two vehicles of the same model will have the same number within 30 years, providing a unique identifier for each vehicle. Therefore, it can be referred to as the "vehicle's ID card." Common locations include the registration certificate and the lower left side of the front windshield. It's important to note that the engine number is not the same as the engine model. The engine model refers to the specifications and size of the engine within the manufacturer's lineup, and multiple engines can share the same model. The engine number, however, is the production number of the engine, with each engine having a unique number. Structure of the Engine Number: Prefix: Includes the product series code, generation symbol, and regional or company code. Manufacturers can choose appropriate letters as needed, but these must be approved and recorded by the industry standardization unit. Middle Section: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and cylinder diameter. Suffix: Comprises symbols for structural features and usage characteristics. Tail Section: A distinguishing symbol. When differentiation is needed due to improvements or other reasons within the same series, the manufacturer selects an appropriate symbol. The suffix and tail can be separated by a hyphen. The chassis number consists of 17 characters, divided into three parts. Part 1: WMI—World Manufacturer Identifier (positions 1–3); Part 2: VDS—Vehicle Descriptor Section (positions 4–9); Part 3: VIS—Vehicle Indicator Section (positions 10–17).

[River]

Last time I went for the annual inspection, I also looked for these two numbers. They are clearly written on the vehicle license, and the VIN is also engraved on the lower left corner of the front windshield near the passenger side. To find the engine number, you need to open the hood. It's usually on the side of the engine block or near the transmission connection, and the location varies by model. For my German car, it's under the intake pipe. Both numbers are also on the door frame's nameplate, but be careful as some older cars' nameplates may be rusted or blurred. Sometimes, you can also find the stamped VIN under the carpet of the front seats. My buddy almost got into trouble last month when buying a used car because the engine number didn't match. I suggest taking clear photos of these numbers with your phone when checking out a car.

[DiLane]

Opening the first page of the motor vehicle registration certificate reveals the complete engine number and chassis number, which is the most authoritative record location. The 17-digit code at the bottom of the vehicle's front windshield is the VIN (chassis number), and using a strong flashlight on the right corner makes it clearer. For locating the engine number, it's recommended to operate when the engine is cold to avoid burns. German cars often have it near the exhaust manifold, while Japanese cars frequently place it beside the generator. The label on the passenger-side B-pillar contains these two key numbers, and the chassis number can also be found stamped on the right front shock absorber upper mount. During used car transactions, pay special attention to verifying consistency across these three locations: the registration certificate, the engine block engraving, and the windshield VIN code.

[JessicaLynn]

The VIN is very obvious at the bottom left corner of the windshield, in the area below the wipers. The engine number requires getting down to find, usually engraved on the metal plane at the connection between the engine and the transmission, and you may need to clean off grease to see it clearly. When buying a car, make sure to check if the engine number on the vehicle registration matches the actual car. A friend of mine once encountered a used car dealer who re-stamped a rusty engine number. A repair shop mechanic taught me: you can also check the VIN by looking at the label on the passenger seat rail. The stamped number on the frame can be revealed by shining light at a specific angle. However, some new electric cars have compact engine compartment layouts, which may require professional equipment to read OBD data.

[MacAshley]

Those who are into car modifications know that engine swaps require filing for an engine number change. The original chassis number is like an ID card in the corner of the windshield, impossible to scrape off. After lifting the hood, look for a square or rectangular polished area on the side of the engine block—the alphanumeric string there is the engine number. Japanese cars often engrave it on the side of the cylinder block, while American pickups place it on the firewall. At a meetup once, I saw an off-roader waterproof the engine number location. Sometimes, there’s also a stamped number in the spare tire well. Nowadays, when transferring ownership at the DMV, inspectors use reflective mirrors to check hidden spots on the frame. A seasoned modder warns: when relocating the battery, never cover the stamped engine number area.

[Oscar]

According to the 'Motor Vehicle Registration Regulations', the engine number and chassis number must exactly match the registered information. The duplicate of the vehicle license clearly records these two sets of numbers. The Vehicle Identification Number (VIN) is clearly visible at the lower right corner of the front windshield, and professional institutions can read the full vehicle configuration information using a VIN decoder. When verifying the engine number, it should be confirmed that the stamping marks are uniformly deep and shallow, with no signs of secondary processing. The chassis number on the frame is commonly found at the beam position behind the right front wheel, and inspectors will focus on checking for deformation in this area during annual inspections. It is recommended that vehicle owners complete the change registration within 10 days after replacing the engine, bringing all necessary documents.