A Guide to Spark Plugs for the 2013-2022 Hyundai Accent
Keep your Accent's engine running smoothly by understanding when and why to change your spark plugs.
- Symptoms of failure include rough idle, poor acceleration, reduced fuel economy, and a check engine light with P030X codes.
- For best results and longevity, choose Iridium spark plugs from OEM-supplier brands like NGK or Denso.
- Always replace spark plugs as a full set of four to ensure consistent engine performance.
- While a simple DIY job for many, be careful not to damage new plugs; most quality plugs are pre-gapped and should not be adjusted.
Signs of a Failing Spark Plug
When your Hyundai Accent's spark plugs start to fail, your car will usually let you know. Worn plugs can't create a strong enough spark, leading to incomplete combustion. You might notice one or more of these symptoms:
🎬 Watch this video to see common symptoms of bad spark plugs.- Rough Idling: The engine may shake or sound uneven when you're stopped.
- Poor Acceleration: The car may feel sluggish or slow to respond when you press the gas pedal.
- Engine Misfires: You might feel a jerking or stumbling sensation while driving. A flashing check engine light often accompanies a misfire.
- Reduced Fuel Economy: If you're stopping for gas more often, failing spark plugs could be the cause, as unburnt fuel is wasted.
- Difficulty Starting: Worn plugs can make it harder for the engine to turn over, especially in cold weather.
Check Engine Light
A common sign of spark plug issues is a check engine light. Codes like P0300 (random/multiple misfire) or P0301-P0304 (misfire on a specific cylinder) point directly to the ignition system, where spark plugs are a primary suspect.
Choosing the Right Aftermarket Spark Plugs
While you can get spark plugs from a Hyundai dealer, the aftermarket offers a wide range of quality options that often meet or exceed OEM specifications. The key difference between them is the material used for the electrode, which affects performance and, most importantly, lifespan.
Pro Tip: Many owners and mechanics prefer to stick with the original equipment (OE) manufacturer for spark plugs. For Hyundai, this is often NGK. Denso is another highly respected brand that supplies many Japanese automakers and is also an excellent choice.
| Brand Tier | Material | Estimated Lifespan | Best For |
|---|---|---|---|
| Premium (NGK, Denso) | Iridium / Ruthenium | Up to 100,000 miles | Long-term durability and optimal performance, matching or exceeding OE standards. These are often the factory-installed type. |
| Mid-Grade (Bosch, Champion, Autolite) | Double Platinum | Around 60,000 miles | A good balance of performance and price. Platinum plugs offer a longer life than basic copper plugs. |
| Standard (Champion, Autolite) | Copper | Around 20,000-30,000 miles | Budget-friendly and effective, but require much more frequent replacement. |
Known Issues, TSBs, and Recalls
There was a service campaign (TSB #18-01-017) for some 2018 Hyundai Accent models to inspect and replace the spark plugs. This was to address conditions causing rough running and setting misfire codes (P0300-P0304). While no widespread safety recalls exist for spark plugs across the 2013-2022 range, it's important to be aware of other recalls. Some Accent models have been recalled for issues with the ABS module which could cause a fire, and owners were advised to park outside until the repair was made. Always check for any open recalls on your specific vehicle.
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs on my Accent?
The replacement interval depends on the type of spark plug. Standard copper plugs may need changing every 30,000 miles, while long-life iridium plugs can last up to 90,000 miles or more. Your owner's manual has the specific recommendation for your vehicle, but if you experience any symptoms of failure, you should inspect them sooner.
Should I replace all four spark plugs at once? 🎬 See how to replace spark plugs on a Hyundai Accent GDI.
Yes, it is highly recommended to replace all four spark plugs at the same time. This ensures even performance and wear, and it saves you from having to do the same job again in the near future.
Do I need to gap my new spark plugs?
Most modern iridium and platinum spark plugs come pre-gapped from the factory for your specific vehicle. It's a good practice to verify the gap with a feeler gauge, 🎬 Follow this step-by-step guide to replacing your Accent's spark plugs. but you should not attempt to adjust the gap on fine-wire iridium plugs, as you can easily break the delicate electrode. The recommended gap for many Accents is around 0.040-0.044 inches, but always check the specification for your exact plug.
Which brand is best: NGK or Denso?
Both NGK and Denso are top-tier, OEM-quality brands. NGK is widely considered the original equipment supplier for Hyundai. You can't go wrong with either brand; both offer excellent performance and durability. Choosing between them often comes down to price and availability.
Helpful Videos
Technical Specifications
OEM Part Numbers: 18846-10060 18846-10061 18849-09070 18814-11051
Socket Size: 16mm or 5/8 inch. Thread Size: M12x1.25. Gap Size: Varies, but often 0.040"-0.044". Always verify with the specific part manufacturer.
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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.
- Hyundai Accent: