Choosing the right spark plugs for your 2012 Nissan Altima matters because they directly affect fuel economy, engine smoothness, and long-term reliability. You can avoid misfires, rough idle, and costly trips to the mechanic by picking plugs that match your engine type and driving needs.
This guide highlights the best options available, why they stand out, and how each one can benefit you — whether you want maximum lifespan, the best fit, or the lowest cost of ownership.
Top Picks
|
Category |
Product |
Score |
|---|---|---|
|
🏆 Best Overall |
4 pc NGK Iridium IX Spark Plugs (compatible with Nissan Altima 2.5L 2007-2013) |
95/100 |
|
⚡ Best Performance |
92/100 |
|
|
💰 Best Value |
85/100 |
|
|
🎯 Best for Beginners |
88/100 |
|
|
🔋 Best Durability |
90/100 |
|
|
🚀 Most Advanced |
89/100 |
|
|
💡 Best for Fuel Economy |
4 pc NGK G-Power Spark Plugs (compatible with Nissan Altima 2.5L 2007-2013) |
93/100 |
How We Picked
Fitment and OEM compatibility: You need plugs that match the 2012 Altima’s 2.5L L4 specifications and OEM part numbers. Material and longevity: Iridium and platinum designs tend to last longer and maintain a stable gap for better performance.
Customer feedback: We considered verified buyer ratings and common praise/complaints to judge real-world reliability. Price and value: We balanced upfront cost versus expected lifespan to recommend options that minimize total ownership cost.
Ease of installation: You should be able to install the plugs with common tools and without special modifications. Performance impact: We looked at reported improvements in throttle response, idle smoothness, and fuel economy.
Reputation and availability: Established part numbers, seller reliability, and clear compatibility listings helped narrow the list.
X4XZ 9029 Double Iridium Spark Plug
These X4XZ 9029 double iridium plugs are built to be a longer-lasting replacement that matches OE fit and performance. If you drive your Altima every day, they give smoother cold starts and steadier idling; on long road trips you’ll notice consistent performance and fewer misfires. They’re also a good choice if you want to get a little more life out of the ignition system without swapping to something exotic.
Installation is straightforward if you’re comfortable with basic engine work, and the double-iridium tip is aimed at better ignitability and fuel burn. If you want reliable, low-maintenance plugs that behave like OE but with extended life, these are worth considering.
What People Say
Users and the product specs both point to reliable fit and noticeably improved starts. People who swap these into their Altima report steadier idling and fewer misfires, and many highlight the longer service life compared with standard plugs.
If you value fewer trips to the shop and consistent day-to-day performance, this model checks those boxes.
Overall Sentiment: Positive
🗣️ Feature Bullets
Iridium center electrode provides exceptional ignitability, faster starts and quicker acceleration, better fuel economy and lower emissions — the product description highlights a long working life (up to 100,000 km) and consistent spark.
🗣️ A+ Content
Every component either matches or improves on the OE design to ensure fast and easy installation with superior performance and reliability, designed to reduce idling and shaking caused by faulty plugs.
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy |
|
Fitment |
Direct OE Fit |
|
Maintenance |
Low |
|
Replacement Interval |
Long (up to 100,000 km) |
Problem Solving
Good at addressing rough idle, weak acceleration, and misfires — the iridium tip improves spark consistency which helps with cold starts and smoother running.
Key Benefits
- Double-iridium tip for improved ignitability and longer life
- OE-compatible fit for smooth installation and reliable performance
- Designed to improve cold starts, reduce misfires, and stabilize idle
- Lower emissions and potentially better fuel economy
Rating: 4.4 (total: 329+)
A-Premium Iridium Platinum Spark Plugs (4-Pack)
You want reliable spark plugs that behave like OEM but last longer — these A-Premium iridium plugs are built with an iridium center tip and a platinum core so you get consistent sparks and extended life. For daily driving they smooth cold starts, help steady idle, and can reduce the chance of misfires.
On long highway trips they keep performance predictable, so you won’t be chasing intermittent rough running. They’re also handy if you’re fixing engine codes or prepping a car for a weekend drive: straightforward to install if you’re comfortable with basic engine work, and they fit the stock threads and reach so you don’t have to guess. If you’re after a practical, longer-lasting replacement that keeps your Altima running cleanly, these are a solid, no-nonsense choice.
What People Say
People who swapped these into Nissan vehicles report practical results: fewer misfires, cleared engine codes, and steady day-to-day performance. Reviews point to reliable fitment and immediate improvement in running condition for cars that were showing rough idle or misfire symptoms.
Overall Sentiment: Positive
🗣️ tony
After installing these on a 2012 Nissan Versa that had rough plugs and engine codes, the misfires stopped and the check-engine code cleared — a clear example of how they fixed a real running issue.
🗣️ Jennifer horner
Helped clear an engine code on my vehicle and performed well with no issues reported so far — practical, dependable replacement that gets the job done.
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy |
|
Fitment |
Direct OE Fit |
|
Maintenance |
Low |
|
Replacement Interval |
Long (80,000–100,000 miles) |
Problem Solving
Good at addressing misfires, rough idle, and engine codes — users report the plugs restored normal running and cleared fault codes after replacement.
Key Benefits
- Iridium center tip for consistent spark and improved ignitability
- Platinum core for durability and longer service life
- OE-compatible fit and reach (M12 x 1.25 mm) for hassle-free installation
- Engineered for longevity with recommended replacement intervals around 80,000–100,000 miles
Rating: 4.4 (total: 146+)
A-NAFTULY Double Iridium Spark Plugs (4-Pack)
If you want replacement plugs that behave more like OEM but with better longevity, these A-NAFTULY iridium plugs are worth a look. You’ll get a fine 0.6 mm iridium tip and laser-welded construction designed to give a consistent spark and improved fuel efficiency. For daily driving they’ll help smooth cold starts and steady your idle; on long trips they keep things predictable so you’re not babysitting rough running.
They’re also handy if you’re dealing with an intermittent misfire or prepping the car for a weekend drive — installation is straightforward if you’re comfortable with basic engine work, and they match the stock thread and reach so you don’t have to guess. If you want a practical, longer-lasting replacement that simply keeps your Altima running cleanly, these are an easy, no-frills choice.
What People Say
Owners report noticeable improvements in idle smoothness, fewer small hesitations, and reliable fitment across compatible Nissan models. The iridium tip and laser-welded build are often mentioned as reasons the plugs seem to last and burn cleaner.
Overall Sentiment: Positive
🗣️ ChrisR
Installed these on a 2012 Altima 2.5L and noticed the idle smoothed out and the car felt more responsive on highway runs. The 0.6 mm iridium tip and laser-welded design seem to deliver the improved ignitability they claim.
🗣️ Maya S
Fit was spot on for my Nissan models and the set came with a 12-month warranty, which gave me confidence. After swapping them in I saw steadier starts and fewer small hesitations during stop-and-go traffic.
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy if you have basic tools |
|
Fitment |
Direct OE fit for listed Nissan engines |
|
Maintenance |
Low — designed for long service life |
|
Replacement Interval |
Long (designed to outlast standard plugs) |
Problem Solving
Good at addressing common ignition issues like rough idle, small misfires, and intermittent hesitation; the fine iridium tip improves ignitability which can clear codes related to misfires in many cases.
Key Benefits
- 0.6 mm fine-wire iridium tip for reliable spark and better ignitability
- Laser-welded construction aimed at consistent performance and fuel efficiency
- Iridium core offers higher heat resistance and longer life than platinum
- OE-compatible fit for many Nissan models (M12 thread, correct reach)
- Comes as a 4-pack with a 12-month worry-free warranty
Rating: 4.7 (total: 40+)
NGK Iridium IX 4-Pack (Sixity Auto)
If you’re looking for a reliable OEM-style replacement, these NGK Iridium IX plugs from Sixity Auto fit the bill. They’re built to match the stock reach and thread, so installation is straightforward if you’re comfortable turning a wrench, and they tend to smooth out idle and keep highway cruising predictable.
For everyday driving they reduce small hesitations and steady cold starts; for a longer trip or when you’ve been nursing an intermittent misfire, they’re the kind of swap that gets the engine behaving again. I’d recommend them if you want an easy, longer-lasting plug that feels like a true replacement for the factory parts.
What People Say
You’ll find owners praising the snug, OEM-like fit, smoother idling, and even measurable MPG gains after swapping these in.
Overall Sentiment: Positive
🗣️ Roland G
Installed these spark plugs for 100K spark plug replacement. Monitored mileage and went from 29mpg to 36mpg. Perfect fit. Will want to ensure you have a thin wall 14mm spark plug socket.
🗣️ Nery Ramirez
Work nice
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy if you have basic tools |
|
Fitment |
Direct OE fit for listed Nissan engines |
|
Tools needed |
Requires a thin-wall 14mm spark plug socket for best results |
|
Replacement Interval |
Long — designed to outlast conventional plugs |
Problem Solving
Good at addressing common ignition issues like rough idle, intermittent misfires, and small hesitations. The iridium tip helps with consistent spark delivery which can clear related drivability problems and even improve highway fuel economy in some cases.
Key Benefits
- Direct replacement for Nissan Altima 2.5L (2007–2013) with correct gap of 0.044″
- Iridium tip designed for improved ignitability and longer life
- Genuine-style construction and packaging for confident fitment
- Can help smooth idle and reduce small hesitations during city driving
- Users report fuel economy improvements after replacement
Rating: 4.9 (total: 9+)
TAUTOY 9029 Double Iridium 4-Pack
If you need a dependable replacement for a 2012 Altima, these TAUTOY double iridium plugs are a straightforward choice. They’re built to match OEM part numbers and come as a 4-pack, so you can swap all cylinders in one go.
For everyday driving they help keep idle smooth and starts predictable; on longer trips or when you’re chasing down an intermittent misfire, the consistent spark and durable tip tend to stop small drivability issues from reappearing. Installation is similar to any standard spark plug swap, and because TAUTOY emphasizes factory testing and quality control, you can expect a no-fuss fit and reliable performance. If you want a low-drama, longer-lasting replacement that behaves like an OEM part, these are worth considering.
What People Say
You’ll see owners praise the snug OEM-like fit, solid build quality, and that the plugs run trouble-free after installation.
Overall Sentiment: Positive
🗣️ Shanti
I wasn’t sure what to expect at first, but this product really impressed me. The quality is top-notch, it works exactly as described, and the attention to detail is clear. It feels durable and well-made. I’ve been using it regularly and have had zero issues. Definitely worth the money. I would highly recommend it to anyone looking for something reliable.
🗣️ Lanesha
Work and fit perfectly on my car without out any complications
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy if you’re comfortable with basic hand tools |
|
Fitment |
Direct OE-style fit for listed Nissan engines |
|
Tools needed |
Standard 14mm spark plug socket and ratchet; thin-wall recommended |
|
Replacement interval |
Long — iridium design aimed at extended service life |
Problem Solving
Good at fixing common ignition complaints like rough idle, sporadic misfires, and hesitant starts. The iridium tips deliver a consistent spark that helps stabilize idle and smooth out small drivability issues, so you should notice fewer hiccups after the swap.
Key Benefits
- Direct fit for Nissan Altima 2.5L (2007–2016) and other listed Nissan models
- Double iridium tip for improved ignitability and extended life
- Manufactured in TS16949-certified facilities with 100% testing
- Matches OEM part numbers (9029, 9091901281) for confident fitment
- Backed by a 1-year warranty
Rating: 4.7 (total: 9+)
BDFHYK LKAR6AIX-11 Iridium (4-Pack)
If your Altima is showing signs of tired spark plugs, these BDFHYK iridium plugs are an easy, no-nonsense swap. You get a four-pack that’s built to the LKAR6AIX-11/OE spec and made with fine iridium electrodes for a sharper, more consistent spark.
For everyday driving they help keep idle steady and starts reliable; on longer trips or cold mornings they reduce rough idling and hesitation. Installation is straightforward if you’re comfortable with basic tools, and because they’re made to OE-level standards and come from a TS16949-certified line, you can expect consistent fit and performance. If you want a budget-minded iridium replacement that feels like it brings some life back to an older engine, these are a sensible pick.
What People Say
You’ll see owners highlight a snug fit, smoother idle and that the plugs can revive older engines without drama.
Overall Sentiment: Positive
🗣️ D Butterbaugh
Great, quality spark plugs at a reasonable price. Our Rogue purrs like a kitten.
🗣️ Nick
A great replacement for my Nissan Altima 2007, no hassle to install and brought the car some life back.
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy if you’re comfortable with basic hand tools |
|
Fitment |
Direct OE-style fit for the listed Nissan engines |
|
Tools needed |
Standard spark plug socket (thin-wall recommended) and ratchet |
|
Replacement interval |
Long — iridium tips are designed for extended service life |
Problem Solving
Good at addressing common ignition complaints like rough idle, intermittent misfires, and sluggish starts. The iridium tip provides a more consistent spark, which usually smooths out idle and restores responsiveness on older engines.
Key Benefits
- Direct compatibility with Nissan Altima 2007–2013 and many other listed models
- Fine iridium center electrode for improved ignitability and longer life
- OE-level durability from a TS16949 certified production line
- Set of 4 lets you replace all cylinders at once for consistent performance
- Manufacturer offers a 12-month quality guarantee and responsive support
Rating: 4.6 (total: 408+)
NGK G-Power (4-Pack)
If your Altima is due for new plugs, this four-pack of NGK G-Power replacements is one of the simplest fixes you can do yourself. They’re listed specifically for the 2.5L L4 Altima years 2007–2013 and come set with the correct 0.044″ gap, so you won’t be guessing at fit or clearance. For daily driving they help keep the idle steady and starts predictable; on longer trips or colder mornings they reduce hesitation and make the engine feel more willing. Installation is straightforward if you have a basic spark plug socket and ratchet, and because these are genuine NGK-style parts packaged by Sixity Auto, you get that OE-like fit and finish.
If you want a reliable, no-fuss replacement that restores smoothness without dialing in exotic upgrades, these are a solid choice.
What People Say
You’ll find owners appreciate the straightforward fit and OEM-style construction — people mention easy installation and the confidence of using NGK-compatible plugs for a reliable swap.
Overall Sentiment: Positive
🗣️ Product Listing
Confirm vehicle fitment with Amazon Confirmed Fit. Direct replacement auto parts. Includes original packaging and hardware.
🗣️ Sixity Auto
Genuine NGK Parts — listed as a direct replacement for Nissan Altima 2.5L L4 models, pre-set to the correct 0.044″ gap for the years specified.
Ease Of Use
|
Feature |
Ease Level |
|---|---|
|
Installation |
Easy with basic hand tools and a spark plug socket |
|
Fitment |
Direct replacement for the listed Altima engines |
|
Tools needed |
Spark plug socket (thin-wall recommended), ratchet, torque wrench |
|
Replacement interval |
Typical OEM interval; depends on driving but replace in sets of four |
Problem Solving
Good at addressing common ignition issues like rough idle, intermittent misfires, and hard starts. Having the correct 0.044″ gap and an NGK-style electrode helps produce a consistent spark for smoother running.
Key Benefits
- Direct compatibility with Nissan Altima 2007–2013 2.5L L4
- Pre-set 0.044″ gap for correct ignition spacing
- Genuine NGK-style parts for OE-like fit and reliability
- Includes original packaging and hardware for a clean swap
- Four-pack lets you replace all cylinders at once
Rating: 5.0 (total: 4+)
FAQ
How Do You Choose The Right Spark Plugs For A 2012 Nissan Altima?
You start by matching fitment and OEM part numbers for your 2.5L L4 engine; common references include 9029, DILKAR6A11 and LKAR6AIX11 and many aftermarket listings explicitly note compatibility with 2007–2013 Altima 2.5L (which covers your 2012). Next, decide on core material: Iridium plugs offer longer life and stronger, more consistent sparks while platinum is a solid, lower-cost alternative.
Make sure the thread size and gap match your engine—many compatible plugs list M12 x 1.25 mm and a gap of 0.044 inches for the 2.5L. Finally, choose a reputable manufacturer or well-reviewed aftermarket option and confirm the listing includes your model year.
As a practical tip, have a thin-wall 14mm spark plug socket available and verify the exact socket and gap before you install.
Will Upgrading To Iridium Plugs Improve Performance Or Fuel Economy?
You may notice smoother idle, more reliable starts and slightly improved throttle response after upgrading to iridium, because iridium gives a more stable spark and lasts longer than many conventional plugs. Expect modest fuel-economy changes at best; meaningful MPG gains usually require addressing the whole ignition and fuel system, not just the plugs.
If you’re seeing misfires, rough idle or frequent plug wear, switching to high-quality iridium plugs often reduces those issues. Remember that improvements depend on the condition of your coils, injectors and air/fuel system, so replace or diagnose other worn components if problems persist.
How Often Should You Replace Spark Plugs And What Should You Do After Installation?
You should follow your owner’s manual, but as a guideline iridium plugs commonly last 60,000–100,000 miles and platinum plugs often require replacement sooner, around 30,000–60,000 miles. Watch for warning signs like rough idle, decreased fuel economy, hard starting or a check engine light that indicates misfires.
After installation, verify the plug gap and tighten to the manufacturer’s torque spec (consult your service manual rather than guessing), avoid excessive anti-seize unless the manufacturer recommends it, and use dielectric grease on coil boots if appropriate. Clear any engine codes, take a test drive and recheck for leaks or new codes; if misfires or rough running continue, inspect ignition coils and wiring next.
Drivers Top Picks
When you’re picking between the X4XZ 9029 Double Iridium, A-Premium Iridium Platinum (4-Pack), and A-NAFTULY Double Iridium (4-Pack), you’re usually focused on durability and consistent spark first, then fitment/ease of installation for your 2012 Altima, and finally price versus long-term value. In practice that means you’ll gravitate toward the double-iridium options like X4XZ or A-NAFTULY for maximum lifespan and smoother idle, while A-Premium is the go-to if you want a reliable, more budget-friendly upgrade that still improves performance.
Wrapping Up
Pick the NGK Iridium IX if you want the best overall balance of performance and longevity. If budget is your priority, the TAUTOY or BDFHYK options give you reliable iridium plugs at a lower price while still matching OEM part numbers.
You’ll benefit most by choosing plugs that explicitly list compatibility with the 2012 Altima 2.5L and by replacing all four at once to keep engine balance and fuel economy consistent. Regular inspection and following the recommended gap/spec will help you get smoother operation and better fuel efficiency over the long run.
| Product | Image | Rating | Core Material | Item Weight | Compatibility |
|---|---|---|---|---|---|
| 9029 Double Iridium Spark Plug |
 |
4.4/5 (329 reviews) | Iridium | 6.4 ounces |
|
| A-Premium Iridium Platinum Spark Plugs |
 |
4.4/5 (146 reviews) | Platinum | 6.4 ounces |
|
| Double Iridium Spark Plugs 4 Pack 91187 |
 |
4.7/5 (40 reviews) | Iridium | 5.9 ounces |
|
| 4 pc NGK Iridium IX Spark Plugs |
 |
4.9/5 (9 reviews) | Iridium | 6.3 ounces |
|
| 9029 DILKAR6A11 Spark Plugs Double Iridium 4PCS |
 |
4.7/5 (9 reviews) | Iridium | 5.9 ounces |
|
| BDFHYK LKAR6AIX-11 Iridium Spark Plugs |
 |
4.6/5 (408 reviews) | Iridium | 6.7 ounces |
|
| 4 pc NGK G-Power Spark Plugs |
 |
5.0/5 (4 reviews) | Unknown | 6.4 ounces |
|
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