2017 Nissan Altima: Spark Plug Replacement Guide
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Engine | OEM Plug PN | Aftermarket | Gap (in/mm) | Torque (lb-ft / Nm) | Interval |
|---|---|---|---|---|---|
| 2.5L QR25DE | 22401-1KC1C | NGK LKAR6AGP | 0.044 / 1.1 | 14 / 19 | 100,000 mi |
| 3.5L VQ35DE | 22401-JK01D | Denso 3491 | 0.044 / 1.1 | 18 / 24 | 100,000 mi |
Why the right plug matters
Choosing the correct spark plug is crucial for your engine's performance, longevity, and efficiency. The manufacturer specifies a plug with a particular heat range to ensure it operates at a temperature high enough to burn off carbon deposits, but not so hot that it pre-ignites the fuel. The electrode material is also key. Iridium plugs, as specified for the Altima, offer the best performance and longest lifespan (often 100,000 miles or more). Platinum is a good alternative, though with a slightly shorter life. Traditional copper plugs are cheapest but may need replacement every 30,000 miles and are not recommended for modern ignition systems designed for iridium.
How to gap a spark plug
Even if the plug is advertised as "pre-gapped," it's essential to verify the gap before installation. Use a feeler gauge or a wire-style gap tool. Never use the "ramp" style coin gauge, as it can damage the fragile iridium tip. Slide the correct gauge wire (0.044" for the Altima) between the center and ground electrodes. It should slide through with slight drag. If adjustment is needed, gently bend the ground strap — never the center electrode — to open or close the gap. Tiny adjustments are all that should be required.
Replacement procedure tips
Replacing the plugs on either the 2.5L or 3.5L Altima engine is straightforward. Both use a coil-on-plug system, meaning each spark plug has its own ignition coil directly on top of it.
- Coil Removal: After removing the engine cover, unplug the electrical connector from the coil. Then, remove the single 10mm bolt holding the coil in place. Gently twist and pull the coil straight up to remove it.
- Anti-Seize: There's a debate on whether to use anti-seize on the plug threads. NGK and Denso generally advise against it, as their plugs have a special trivalent plating that prevents seizing and provides accurate torque. If you do use anti-seize, be sure to reduce the torque value by about 20% to avoid overtightening.
- Dielectric Grease: Apply a small dab of dielectric grease to the inside of the ignition coil boot before reinstalling it. This prevents the boot from sticking to the plug, makes future removal easier, and helps seal out moisture.
Known issues
Unlike some notorious engines like the Ford 3-valve modulars known for their two-piece plugs breaking, the 2017 Nissan Altima's QR25DE and VQ35DE engines are not known for any specific, widespread spark plug-related issues. The replacement process is generally free of common headaches, provided you use the correct tools and follow the proper torque specifications.
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More specs for the 2017 Nissan Altima
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2017 Nissan Altima Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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