Aftermarket part
IAM · independent aftermarket · non-genuine part
An aftermarket part is a replacement part designed to fit a given vehicle but manufactured and distributed outside the vehicle manufacturer's network. The term covers a very wide quality spectrum, from original-equipment suppliers down to entry-level production — it designates a channel, not a grade.
Director of publication : Florian Précigout
It is the core of the independent aftermarket and the reason equivalence catalogues exist: without it there would be no alternative to the manufacturer's number. The distributor's job is to bring order to that spectrum by ranking the ranges it stocks, rather than letting price decide alone.
The counter conversation rarely turns on the word itself. It turns on three questions: does the part apply to this exact vehicle, what is the warranty, and what happens if it fails early on a vehicle under contract. An aftermarket offer that does not address those three will be compared on price alone.
On safety-related parts — braking, steering, suspension — scrutiny is higher and supplier traceability becomes a selling argument as much as a precaution.
The trap
Treating "aftermarket" as a synonym for "cheaper". Some aftermarket parts are produced by the original-equipment supplier and cost close to genuine; others share nothing but the mounting dimensions.
Frequently asked
Does an aftermarket part void the vehicle warranty?
No, not merely by being aftermarket. In Europe, using matching-quality parts for routine servicing is a recognised practice; what stays open is liability when a failure is attributable to the part itself.
How do you compare two aftermarket options on the same reference?
By the catalogue's technical criteria, not by the photo: dimensions, material, number of fixings, presence of a sensor. Two lookalike numbers can differ on a criterion that prevents fitting.