A Guide to Spark Plugs for the 2013-2024 Jeep Wrangler
Worn spark plugs can hurt your Wrangler's performance on and off the road; find the right replacements here.
- For best results, use OEM-equivalent Iridium spark plugs from brands like NGK or Champion.
- The 3.6L V6 engine requires removing the upper intake manifold for a full spark plug change, making it a much larger job than the 2.0L engine.
- Replacement interval is 100,000 miles for the 3.6L V6 and 60,000 miles for the 2.0L Turbo/4xe.
- Always check the spark plug gap before installation, even if they are advertised as pre-gapped.
Symptoms of Failing Spark Plugs in a Wrangler
When your spark plugs are wearing out, your Jeep will give you signs. A common symptom is a rough idle, where the engine shakes or vibrates more than usual when you're stopped. You might also notice the engine misfiring, which can feel like a hesitation or stumble during acceleration. This is often accompanied by a check engine light with codes like P0300 (random misfire) or codes from P0301 to P0306, each indicating a misfire in a specific cylinder. 🎬 Watch this video to see how a misfire was diagnosed and solved. Other signs include reduced power, worse gas mileage, and trouble starting the engine.
Engine Differences Matter
The 2013-2024 period covers two Wrangler generations (JK and JL) and multiple engines. The 3.6L Pentastar V6 is common in both, while the 2.0L Turbo I4 and 2.0L 4xe Plug-in Hybrid are found in the newer JL models. Each engine has different spark plug requirements and replacement procedures.
Choosing the Right Aftermarket Spark Plugs
When it's time for a replacement, you have many choices. For most owners, sticking close to the original equipment (OEM) design is the safest bet for reliability.
Brand Quality Tiers
- OEM & Premium Aftermarket (Best Choice): Mopar is the official OEM brand, but they don't make their own plugs. For the 3.6L Pentastar, the original plugs are often made by Champion or NGK. For the 2.0L Turbo and 4xe, NGK is the OEM supplier. Choosing Iridium plugs from NGK, Champion, or Denso is a great upgrade or equivalent replacement that ensures a long service life and strong performance. These brands are consistently recommended by mechanics and experienced owners for their reliability.
- Standard Aftermarket (Good Choice): Brands like Bosch and Autolite offer quality spark plugs, including long-lasting double platinum and iridium options. They are a solid choice for daily driving and can provide excellent performance when matched correctly to your Wrangler's engine.
- Jeep-Specialist Aftermarket (Use with Caution): Brands like Crown Automotive and Omix-Ada are well-known for making a huge variety of Jeep replacement parts. While many of their parts are reliable, for critical ignition components like spark plugs, owner feedback is mixed. It's generally safer to stick with established ignition brands like NGK, Champion, or Denso for consistent performance.
Pro Tip: Many modern iridium and platinum spark plugs come pre-gapped from the factory. However, it's always a good idea to verify the gap with a feeler gauge before installation, as they can be knocked out of spec during shipping.
Known Issues and Recalls
While there are no widespread recalls specifically for spark plugs on these Wranglers, some Technical Service Bulletins (TSBs) have been issued. TSB 09-013-20 REV. A was released for some 3.6L engines due to a manufacturing issue with original spark plugs that could cause a misfire, requiring the replacement of all six plugs. Additionally, some 2018 models had a TSB for a spark knock condition caused by oil intrusion. No major recalls related to spark plugs were found with the NHTSA.
Installation Considerations
Replacing spark plugs on the 2.0L Turbo and 4xe engines is relatively straightforward, with all four plugs easily accessible on top of the engine. 🎬 See this walkthrough for changing plugs on the 2.0L turbo engine. However, the 3.6L Pentastar V6 presents a significant challenge. To access the driver's side spark plugs (cylinders 2, 4, and 6), the entire upper intake manifold must be removed. This makes the job much more time-consuming and difficult for a DIY mechanic. It is highly recommended to replace the intake manifold gaskets at the same time.
🎬 Watch: Step-by-step guide to the 3.6L Pentastar spark plug replacement.| Item | Estimated Cost |
|---|---|
| New Aftermarket Spark Plugs (Per Plug) | $9.03 - $45.83 |
| New OEM Spark Plugs (Per Plug) | $18 - $32 |
| Shop Labor (2.0L Engine) | $100 - $200 |
| Shop Labor (3.6L Engine) | $250 - $450+ |
Frequently Asked Questions (FAQ)
How often should I change the spark plugs on my Jeep Wrangler?
For the 3.6L Pentastar V6 engine, the recommended interval is every 100,000 miles. For the 2.0L Turbo engine (including the 4xe hybrid), the interval is shorter, typically every 60,000 miles. However, some sources recommend a 30,000-mile interval for the 2.0L under severe conditions. Some 4xe owners have reported improved engine smoothness by changing plugs earlier, around 40,000 miles.
What is the difference between Iridium, Platinum, and Copper plugs?
The main difference is the material of the center electrode, which affects lifespan and performance. Iridium plugs have the longest life (often 100,000 miles or more) and provide the most consistent spark. Platinum plugs are a step down but still offer a long service life, much better than standard copper. Copper plugs have the shortest lifespan but are excellent conductors; they are typically used in older vehicle designs, not the modern Wrangler engines.
Is replacing the spark plugs a DIY job?
For the 2.0L engine, it is a very feasible DIY job for someone with basic tools. For the 3.6L V6, it is much more advanced due to the need to remove the upper intake manifold. While it can be done at home, it requires more time, patience, and mechanical confidence.
Do I need to put anti-seize on the new spark plug threads?
This is a debated topic. Major manufacturers like NGK advise against it, as their plugs have a special trivalent plating that acts as an anti-seize and provides proper grounding. Adding extra anti-seize can lead to over-torquing the plug, which can cause damage. It's best to follow the specific recommendation of the spark plug brand you are installing.
Helpful Videos
Technical Specifications
OEM Part Numbers: SP149125AD 68303918AA 68292346AA
Engine-specific. The 3.6L V6 uses six spark plugs, while the 2.0L Turbo and 4xe use four. Plug material is typically Iridium or Platinum from the factory. Common hex size is 5/8 inch.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Jeep Wrangler: