Honda EPC: Reading Honda and Acura Part Numbers and Finding Parts by VIN
What the Honda catalog covers
The Honda electronic parts catalog is the manufacturer's own parts data for Honda vehicles, and it carries Acura with it. Acura is the badge Honda uses in several markets for its upper range rather than a separate company with separate parts, so the two sit in the same data with a great deal of overlap underneath.
That overlap is practically useful. Where an Acura shares a platform with a Honda, a substantial share of the components carry the same numbers, which widens availability considerably compared with treating the badge as its own supply chain.
Reading the number: three blocks, three jobs
Take 17220-P8C-A00 and split it where the hyphens are. Each block answers a different question and once you know which, the number stops being a string.
The first five characters identify the component group. This is the functional classification: what kind of part it is, independent of which car it went on. Anything numbered 17220 is the same kind of component whether it sits on a Civic or an Accord.
The middle three characters are the model code, and this is the block that does the fitment work. It identifies the vehicle the part was designed for, or the first vehicle it was designed for in the case of a component that later spread across the range. When two numbers share a component group and differ in the middle, they are the same kind of part for different cars.
The last three characters are the revision. The first two track improvements to the same part as Honda refines it, and the trailing character relates to the supplier or market designation. This is the block that moves quietly under an old invoice.
Why the middle block is the one to watch
The practical payoff is speed at the counter. When a customer quotes a number and yours differs only in the middle block, you are looking at the same component for a different car, and the conversation is short. When the first block differs, they are describing a different kind of part entirely, however similar the description sounds.
It also explains something that puzzles people the first time. A part can be listed under a model code for a car that is not the one in front of them, and still be correct, because the component originated on that model and Honda carried the number across when it reused the part. The catalog resolving the VIN is what confirms it rather than the model code looking wrong.
The revision block, and why old invoices mislead
Honda revises parts steadily, and each revision moves the trailing block. A number that was right in 2015 may have moved through several revisions since, with material changes, a different seal specification or a dimensional refinement behind each one.
The failure mode is ordinary and avoidable. Somebody has the part number from the last time the job was done, orders it, and receives either a superseded item or nothing at all because the number has been retired. Reading the current number from a live catalog costs a few seconds and removes the problem.
Where Honda builds catch people out
Honda specifies for market to an unusual degree, and the same nameplate in two regions can differ in ways that reach the parts list. Emissions equipment, lighting, glass, and the brackets around anything market-specific are the usual suspects.
Production is spread across plants in several countries for the same model, and the plant is encoded in the VIN. That is one of the reasons resolving the build properly matters more here than the model name suggests: two cars with identical badges, years and trim can come from different plants with different suppliers behind some components.
What comes across the counter on an ageing Honda
Honda's reliability reputation shapes what actually arrives. These cars stay on the road a long time, which means a large share of the work is wear rather than failure.
- Suspension bushes, arms and links on high-mileage cars
- Brake hardware, particularly carriers and slide pins in salted climates
- Cooling components: thermostats, water pumps, hoses and radiators
- Ignition and charging parts on older petrol engines
- Interior trim, door hardware and window mechanisms
- Timing components on the engines that use a belt rather than a chain
Where the catalog stops
The parts catalog identifies components by VIN with their genuine numbers, quantities, diagrams and supersession history. It is not a repair manual and it does not talk to a control unit.
On Hondas of the last decade a number of components need configuration after fitting, and that is a diagnostic tool rather than a catalog question. Establishing which parts carry that requirement before quoting is worth the minute it takes.
Frequently asked questions
How do I read a Honda part number?
Split it at the hyphens. Take 17220-P8C-A00: the first five characters identify the component group, the middle three are the model code that ties it to an application, and the last three are the revision. The middle block is what decides fitment.
What does the middle section of a Honda part number mean?
It is the model code, identifying the vehicle the part was designed for, or the first vehicle it was designed for where Honda later reused the component. Two numbers sharing the first block and differing in the middle are the same kind of part for different cars.
Does the Honda parts catalog cover Acura?
Yes. Acura is Honda's badge for its upper range in several markets rather than a separate parts operation, so both sit in the same data. Where the platforms overlap, many components carry identical numbers.
Why has my Honda part number changed since last time?
The trailing block tracks revisions, and Honda updates parts steadily as materials, seals and dimensions are refined. An old invoice can carry a number that has moved on several revisions or been retired. Read the current number from a live catalog before ordering.
Can I order a Honda part by model and year instead of VIN?
For consumables usually, for anything that has to fit properly no. Honda specifies heavily by market and builds the same model in several plants, and the VIN is what resolves which combination you are actually looking at.
Do Honda part numbers show left and right?
The distinction is carried within the component group on many assemblies rather than being obvious from the number alone. Read the callout on the exploded diagram rather than assuming the sides are symmetrical.