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This shortlist is deliberately scoped to the 2012 Subaru Impreza 2.0L FB20. The first three products have direct 2012 2.0L evidence and should not be selected for WRX, STI, or later Impreza engines by name alone. The final two cards are clearly labelled close alternatives for different Impreza applications; they demonstrate why the vehicle badge is not enough for a plug purchase. Use the VIN, engine code, and manufacturer catalogue before ordering. Replace all four plugs as a set and do not change the gap on a pre-gapped fine-wire plug unless the relevant Subaru service information instructs you to do so.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Subaru 22401AA780 / 22401AA781 OEM Spark Plug | $20.04 each | Amazon |
| 2 | NGK 92274 Ruthenium HX Spark Plug | $55.99 per set of four | Amazon |
| 3 | Denso 3442 Iridium Long Life Spark Plug | $28.49 each | Amazon |
| 4 | Close alternative: Subaru 22401AA880 for 2017–2023 2.0L | $25.69 each | Amazon · eBay |
| 5 | Close alternative: Subaru 22401AA670 for 2.5L turbo | $17.17 each | Amazon · eBay |
The picks, in detail
Subaru 22401AA780 / 22401AA781 OEM Spark Plug
SubaruPartsDeal lists 22401AA780 for the 2012 Impreza and says it is replaced by 22401AA781. Its dealer page identifies 2012 Impreza submodels and specifies a required quantity of four.
- 2012 OEM dealer listing
- 22401AA780 superseded by 22401AA781
- SILZKAR7B11 manufacturer note
- Four-plug set quantity
- Direct 2012 catalogue evidence
- Genuine Subaru path
- Not a later-generation part
NGK 92274 Ruthenium HX Spark Plug
CarParts sells an NGK 92274 set of four for the 2012 Impreza 2.0L four-cylinder. The product is LKR7AHX-S and its card is limited to the direct 2012 FB20 application.
- 2012 2.0L CarParts fitment
- NGK 92274 LKR7AHX-S
- Ruthenium HX series
- Four-plug retail set
- Single matched set price
- Not a universal Impreza plug
Denso 3442 Iridium Long Life Spark Plug
The Wrench Monkey lists Denso 3442 for the 2012 Impreza 2.0L 1995cc H4, with an iridium center and platinum ground strap. AutoZone shows a current US price of $28.49 for part 3442.
- 2012 2.0L 1995cc H4 listing
- Denso 3442 part number
- Iridium long-life design
- Platinum ground strap
- Direct FB20-era vehicle evidence
- Current US retailer price
- Four individual plugs are needed
Close alternative: Subaru 22401AA880 for 2017–2023 2.0L
This genuine Subaru plug is a close alternative for the later 2017–2023 Impreza 2.0L, including 5MT and CVT versions. It is explicitly not an interchangeable recommendation for the 2012 FB20 cards above.
- 2017–2023 2.0L only
- 5MT and CVT applications
- Subaru 22401AA880
- Later-generation OEM number
- Direct later-Impreza fitment
- Clarifies generation split
- Not for 2012 purchase
Close alternative: Subaru 22401AA670 for 2.5L turbo
SubaruParts.com lists 22401AA670 for a 2.5L turbo application and identifies NGK SILFR6A as the vendor number. It is a close alternative only to make the turbo/non-turbo distinction visible, never a 2012 FB20 substitute.
- 2.5L turbo application
- Subaru 22401AA670
- NGK SILFR6A vendor number
- Dealer-listed US price
- Shows engine family changes the plug
- Direct dealer catalogue data
- Not compatible with 2012 FB20
Buying tips
- Verify the engine code before buying.
- Order four identical plugs for the FB20.
- Keep close alternatives out of a 2012 cart.
- Use a thin-wall spark-plug socket.
- Follow the relevant Subaru torque specification.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.