Ignition coils (NA, NB, NC, ND)
Ignition coils and coil packs fail on every Miata generation, and the NB's 1999-2000 coil pack is the best-known case. This page lists who sells replacements and what owners said. It is not a repair guide.
How to read it. Seller claims are as read on each seller's own page on 1 October 2026. Owner accounts are from Miata.net forum threads, dated below, and are individual experience, not advice. There are no prices on this page, and nothing here was bought or tested.
NA and NB (1990-2005)
| Seller | What it says it offers | Fits (as stated) |
|---|---|---|
| Moss Miata, aftermarket coil | says aftermarket coils "work just like the OEM ones" without the OEM price; a new coil for the 1.6 litre car. 12-month warranty, not covering labor | 1990-1993 NA |
| Moss Miata, coil pack by Mazda | the factory Mazda coil pack, which it calls a reasonably priced replacement; OE reference BPE8-18-10XC-9U | 1995-1997 NA |
| Moss Miata, coil and ignitor by Mazda | one coil pack with its ignitor; OE reference BP4W-18-10XB-9U | 1999-2000 NB |
| Moss Miata, ignition system category | the category page also lists an aftermarket coil for 2001-2005, a Toyota coil-on-plug bracket from R Theory Motorsports, NGK plugs and several plug wire sets; I read the category listing, not those product pages | NA and NB |
| Good-Win Racing, Flow Force LS coil kit | a stainless bracket that mounts LS-style coils and revised plug wires, with new coils; for the 1.8 litre engines. It says the 1994-2000 cars are a direct bolt-on and 2001 on need some do-it-yourself fitting, and the 1990-1993 chassis with a 1.8 needs a different kit. It warns that "plug and play" means it plugs into the car, not that it works with the factory ECU: it needs a fully tuneable standalone ECU | 1994-2005 1.8 litre |
NC (2006-2015)
| Seller | What it says it offers | Fits (as stated) |
|---|---|---|
| Moss Miata, coil by Mazda | a Mazda coil, OE reference L3G2-18-100B-9U; the application list shows four coils per car | 2006-2015 |
ND (2016 on)
| Seller | What it says it offers | Fits (as stated) |
|---|---|---|
| Moss Miata, ignition coil | listed as a direct replacement for the original coil, with a fit guarantee and a 12-month warranty | 2016-2025 |
What owners said
- The 1999-2000 cars (December 2002). An owner started a Miata.net survey of coil failures on those cars, asking people to report year, mileage and whether Mazda fixed it under warranty, so the owners could complain to Mazda. The symptoms he listed were a check-engine light with codes for oxygen sensor inactivity, random and per-cylinder misfires and catalyst efficiency, and a rough-running engine. (Miata.net thread; I read the opening post, not the whole survey.)
- Why coil packs fail (April 2007). One poster said heat kills the ignitor electronics inside the pack. Another, with a Miata.net sponsor badge, said the heat from the engine combines with the heat a coil makes when it cannot fire because of a bad plug, wire or sensor, and that anything that causes a misfire will sooner or later kill the pack; he said one of the "improved" packs had failed on him too. A third poster said a pack died a week or two after he cleaned the engine, and a fourth said he had seen many threads about misfires after engine cleaning. (Miata.net thread.)
Search results also describe swapping coil halves left to right to see whether a misfire follows the coil, say a misfire code left unattended can ruin the catalytic converter, and quote an ND owner whose coil failed at about 85,500 miles; I did not read those threads, so treat them as leads.
Not covered yet
- Coil-on-plug kits for the NA and NB other than the two above, and spark plug advice for any generation.
- An ND owner account I read, and coil sellers other than Moss for the NC and ND.
© 2026 Fischer Interactive LLC. Written for the Ref Sensor app's Miata users. The seller's page is the authority.