Code index: every SPN/FMI, P-code, and manufacturer key

What the index contains

The index is built from the same records as the model tables. A key is one code identity: an SPN/FMI pair, a P-code, or a manufacturer label code. The current registry has 1,192 keys: SPN / FMI: 538; P-code: 500; Manufacturer label: 154. The keys are sorted by tier, then by the number of model records, then by key. The tier is a model-count band, not a quality score: Tier A means 20 or more model records, Tier B means 5 to 19, Tier C means 2 to 4, and Tier D means one. The current tier counts are Tier A: 211; Tier B: 365; Tier C: 258; Tier D: 358.

Some rows print both an SPN/FMI pair and a P-code. The registry uses the P-code as the key for those rows, so the type split above is not a count of every SPN/FMI pair. The FMI reference counts 746 distinct SPN/FMI pairs; the additional pairs sit inside P-code keys here and remain visible on the linked model page.

Each row shows the key, the key type, the first printed label, the model count, the year range, and a link to a page where the key appears. The label column is deliberately short. A key with more than one printed label shows the first label and a count; the label-variance reference lists every label for those keys.

Key formats

SPN / FMI keys use the form SPN 110 / FMI 3 in the table and S:110-3 in the registry. P-code keys use the printed code, such as P0112. Manufacturer label keys use the printed label code, such as a Segway module code or an Arctic Cat C-code. The key type is shown in the second column so a reader does not have to infer it from the spelling.

The page link uses the first anchor that resolves to a generated model page. A key can appear in several model-year tables; the link opens one of them, and the model-year page for a specific machine remains the better starting point when the year is known.

50 keys also have a per-code page in the Phase 3 pilot. Those rows show a second “Code page” link beside the model-table link. The per-code pages are staged with noindex,follow until the indexing baseline and QA gate are complete.

How to use the index

Search by code number, SPN, P-code, component word, year, or brand. The filter works on the whole row, including all printed labels and the year list. Use the decoder when the SPN and FMI are already known and the goal is a direct lookup. Use the model-year changes page when the question is whether two years share a table.

Limits

The index lists keys observed in the collected manuals. A missing key can mean the code is not published in those manuals, the table uses a different format, or the source has not been collected. The model count is a count of published model-code rows, not a count of machines in service. The index does not add a diagnosis or a repair instruction; it points to the OEM label and the model page.

Related reference

Browse by family

Family hubs keep the model-year and manual context together. They are the better entry point when the code is known but the table page is not.

Browse by system

System hubs follow a component family across brands and table generations. They are the better entry point when the question is about a module, circuit, or signal rather than a model year.