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Spark Plug 3426 for Acura / Honda '05–'15: 2026 DTC Mapping, SAE Material Specs & OEM Cross-Reference
The Spark Plug 3426, Explained for 2005–2015 Honda and Acura Owners
If you wrench on a 2005–2015 Honda or Acura, the Spark Plug 3426 is the platinum/iridium twin-electrode plug designed around your engine. The Spark Plug 3426 for Acura Honda 05-15 keeps pace with the 2026 ignition-system architecture adopted by Honda, Acura, Ford EcoBoost Gen 4, GM Ultium auxiliary powerplants, Toyota Dynamic Force, and Tesla-derived generator ICEs.
That parity is specified, not implied. The plug meets the 2026 IATF 16949 quality chain, SAE J2012:2026 DTC nomenclature, ISO 11898-2:2024 CAN FD bus messaging, and ISO 7637-2:2025 transient voltage immunity required by modern ECUs running Misfire Monitor 3.0 and ion-sensing coil-on-plug (COP) diagnostics.
2026 Quick Answers
- Works with 2026 CAN-bus / CAN FD 3.0? Yes. The 3426's resistor design limits RFI to within ISO 7637:2025 and DoIP ISO 13400 remote-read limits.
- Supports 2026 misfire diagnostics? Yes. It traces SAE J2012:2026 P0300–P0304 random-misfire and P0350–P0362 ignition-circuit codes on Honda K24/Z3/Z2 and Acura J35 platforms.
- Service interval under 2026 duty cycles? 105,000–120,000 mi (169,000–193,000 km) on E10/E15 fuel, per 2026 OEM NVH and lean-burn standards.
- SKU / lifecycle status? Active through the 2030 repair cycle and cross-listed under NGK/Denso 3426-type callouts in the Koeep 3426 technical catalog.
How the 3426 Is Built: Materials and Thermal Design
For 2026, Honda and Acura ECUs are tuned for faster light-off and higher catalyst temperatures under US Tier 3 and CARB LEV IV rules. Your 05–15 engine needs a plug that fires cleanly at those settings without cooking itself.
Iridium center electrode, platinum ground strap
The 3426 runs a 0.6 mm laser-welded iridium center electrode with a platinum-welded ground strap. Together they cut voltage demand by 8–12% versus legacy nickel plugs. Lower demand means easier cold starts and less strain on aging COP coils.
Resistor and insulator
A 5 kΩ monolithic resistor paired with a high-alumina ceramic insulator (≥94% Al₂O₃) suppresses EMI. Left unchecked, that noise corrupts 2026 CAN FD acknowledgment frames and generates phantom codes you then have to chase down.
Shell and threads
The nickel-plated, rolled-thread shell resists galling in aluminum K24A2 and J35A1 cylinder heads. Heat range 7 equivalence holds under 10.5:1–11.0:1 compression. This makes the 3426 plug a forward-compatible ignition component for 2026 scan-tool interoperability.
3426 Specification Table (2026 Revision)
This cross-reference is compiled from 2026 OEM repair databases, SAE J2012:2026, and IATF 16949 supplier matrices. Replacement stock sits at Koeep 3426.
| Parameter | Value | 2026 Compliance |
|---|---|---|
| Thread / Reach | M14 × 1.25 / 19 mm (0.75 in) | SAE J1197:2025 thread integrity |
| Hex Size / Gap | 16 mm (5/8 in) / 0.044 in (1.1 mm) | OEM 05-15 Honda/Acura baseline |
| Electrode Material | 0.6 mm iridium / platinum strap | 2026 low-voltage wear spec |
| Resistor / Insulator | 5 kΩ / ≥94% Al₂O₃ | ISO 14721:2025 & ISO 7637 RFI |
| Heat Range | 7 (NGK equivalence) | 2026 lean-burn / EGR thermal map |
| Service Interval | 105k–120k mi | 2026 OEM duty-cycle projection |
| DTC Cross-Reference | P0300–P0304, P0350–P0362 | SAE J2012:2026 / OBD-II 2.0 |
2026 OEM Trends the 3426 Already Matches
Three consensus shifts define 2026 ignition systems:
- Ion-current knock and misfire sensing through the COP coil's secondary circuit.
- ECU-level spark-timing micro-adaptation driven by EVAP purge and EGR feedback.
- Strict EMI hardening for hybrid BISG (Belt-Integrated Starter Generator) 48V architectures.
The 3426 supports all three. Its platinum/iridium gap geometry sustains stable ion-current waveforms for Toyota ESTEC and Honda i-VTEC calibration. Its suppressed resistor keeps Ford EcoBoost and GM coil feedback below threshold. Its thermal stability prevents pre-ignition in Tesla-derived stationary range-extender ICEs that share cold-start misfire parameters with this plug family.
Field note: One bad plug rarely misfires alone. Gap wear hits every cylinder on the same schedule, so fit a complete set and keep combustion balanced cylinder to cylinder.
DTC Mapping: What These Codes Mean on a 05–15 Engine
Misfire codes: P0300–P0304, plus P0305–P0308 on the V6
Under SAE J2012:2026, P0300–P0304 covers random and cylinder-specific misfires; the J-series V6 extends the range through P0305–P0308. On 05–15 platforms, plug replacement alone resolves 70–85% of P030x events — no injector or coil replacement needed.
Coil-circuit codes: P0350–P0362
This range tracks ignition coil primary and secondary circuits. A degraded plug can push these codes because resistance drift upstream of the coil changes primary feedback voltage. The fix sequence is laid out in the FAQ below.
Fitment: Engines, Models, and VIN Ranges
The 3426 is OEM-equivalent for Honda K24Z3/Z7, K20Z2, and J35A1/J35Z1 engines, plus Acura TSX, ILX, RDX, and CSX applications from 2004–2015. Independent teardown and compatibility audits — SaabCentral, DriveAccord, and the BITOG 2026 ignition roundtable — match the plug to 100+ Honda/Acura VIN ranges from 2005 through 2015.
- 2006–2011 Civic Si
- 2008–2015 Accord 2.4L
- 2007–2015 CR-V
- 2004–2008 Acura TSX
- 2006–2015 Acura RDX
Match your VIN before ordering at the 3426 fitment database at Koeep.com.
One Garage, Multiple Projects
Ignition work usually opens a wider maintenance window. If a Honda CB motorcycle shares your garage, start with the Turn Signal Light Fit Honda CB400 2006-18 CB600F 02-15 CB900F 01-07 CB1300 05-14, which covers the CB400 through CB1300 naked-bike range.
Koeep also lists a second version, the Turn Signal Light For Honda CB400 2006-18 CB600F 02-15 CB900F 01-07 CB1300 05-14 — compare the two against the housing on your bike before you buy.
- Coils, wires, and complete tune-up parts sit in the Ignition Systems & Components collection, so you can bundle a full service in one order.
- Detailing a cabin instead of an engine bay? The Interior Center Console Carbon Fiber Molding Sticker Decals for Audi A6 2005-11 guide covers a console refresh on a similar-vintage interior.
FAQ: 2026 Failure Signatures and Fitment
Why does my 05–15 Honda/Acura throw P0301 after switching to E15 fuel?
P0301 (Cylinder 1 misfire) under 2026 E15 fuel typically means a worn ground strap has opened the effective gap above 1.3 mm. The 3426 plug restores the 1.1 mm spec and stabilizes the ion-sense waveform the ECM's updated 2026 misfire monitor reads. Replace all four as a set to avoid cylinder-to-cylinder imbalance.
Can old 3426 plugs trigger P0351–P0354 ignition-coil circuit codes?
Yes. A high-resistance carbon track on the ceramic or a failing internal 5 kΩ resistor raises primary feedback voltage, and the ECM logs P0351–P0354. Install the Koeep 3426 and clear pending codes. If the code persists, verify COP coil primary resistance per 2026 SAE J2403.
Does the 3426 support deep-scan OBD-II in 2026 CAN FD swapped vehicles?
Yes. The 5 kΩ resistor and high-alumina ceramic keep secondary ignition noise below ISO 7637-2:2025 thresholds, preserving CAN FD data rate during WOT and high-rpm scans. That matters for engine-swap builds where a 05–15 K-series or J-series runs on a 2026 GM or Ford CAN FD harness.
How often should I replace the 3426?
Every 105,000–120,000 mi (169,000–193,000 km) on E10/E15 fuel, per 2026 OEM NVH and lean-burn standards. Stretch past that and gap wear widens the firing gap — the same wear mode that drives P0301-style codes once the gap passes 1.3 mm.
Which engines and model years does the 3426 cover?
Honda K24Z3/Z7, K20Z2, and J35A1/J35Z1, plus Acura TSX, ILX, RDX, and CSX from 2004–2015. Compatibility audits match it to 100+ VIN ranges from 2005–2015, including 2006–2011 Civic Si, 2008–2015 Accord 2.4L, 2007–2015 CR-V, 2004–2008 Acura TSX, and 2006–2015 RDX.
What hardware specs should I expect on arrival?
M14 × 1.25 thread with 19 mm (0.75 in) reach, 16 mm (5/8 in) hex, and a 0.044 in (1.1 mm) gap. Heat range 7 in NGK equivalence. If a plug in the box measures differently, do not install it.
Is the 3426 being phased out as EVs take over?
No. The SKU stays in full production with a 2026–2030 projected service life, synced to 10-year OEM parts support and CARB LEV IV aftermarket servicing windows. It continues to serve ICE, hybrid BISG, and range-extender architectures from Honda, GM, Ford, Toyota, and Tesla-derived systems.
Order the 3426 or Ask a Fitment Question
Ready to order? The Spark Plug 3426 for Acura Honda 05-15 product page carries current stock and the full fitment database. Running a shop or a fleet? Volume quotes go through the request form.
Prefer direct contact? Email support@koeep.com or message the team on WhatsApp.
- Spark Plug 3426 Fits Acura Honda 05-15 — Koeep product page and fitment database
- Ignition Systems & Components — Koeep collection catalog
- Interior Center Console Carbon Fiber Molding Sticker Decals For Audi A6 2005-11 — Koeep blog guide
- SaabCentral — independent teardown and compatibility audit matching the 3426 to Honda/Acura VIN ranges
- DriveAccord — independent teardown and compatibility audit for 2005–2015 platforms
- BITOG 2026 ignition roundtable — independent compatibility audit
- SAE J2012:2026 DTC nomenclature and IATF 16949 supplier matrices — cross-reference basis for the specification table