Volvo S90 (2017-2024) Spark Plug Replacement Guide
Keep your modern Volvo engine running smoothly by understanding when and how to replace your spark plugs.
- Replace your S90's spark plugs every 60,000 miles for optimal performance.
- Symptoms of failure include rough idle, poor fuel economy, and a check engine light with P030X codes.
- High-quality aftermarket Iridium plugs from NGK, Denso, or Bosch are reliable and cost-effective alternatives to OEM.
- DIY replacement is possible but requires a special 14mm thin-walled spark plug socket.
Is Your S90 Showing Signs of Bad Spark Plugs?
Worn spark plugs can cause noticeable issues with your car's performance. Because the S90 uses a sophisticated engine, it's sensitive to the condition of its plugs. Look out for these common symptoms:
🎬 See a visual guide on common bad spark plug symptoms.- Rough Idling: Your engine might feel shaky or vibrate when the car is stopped.
- Hesitation During Acceleration: The car may feel sluggish or stumble when you press the gas pedal.
- Reduced Fuel Economy: If you're filling up your gas tank more often, failing plugs could be the cause.
- Difficulty Starting: A weak spark can make it harder for the engine to turn over, especially in cold weather.
- Check Engine Light: A misfire caused by a bad spark plug will often trigger the check engine light. Common codes include P0300 (random misfire) or P0301-P0304, which point to a misfire in a specific cylinder. 🎬 Watch: Understanding misfire codes and how to fix them.
Known Issues: Service Action S29842
Volvo issued a service action (S29842) for some 2015-2016 models with 4-cylinder engines, which included early versions of the engine platform used in the S90. The issue involved spark plugs that could crack due to abnormal combustion. The fix was to replace them with a new, improved design (Part No. 31673604). While this action primarily covered earlier models and expired in 2019, it highlights the importance of using the correct, updated plugs in your engine.
Choosing the Right Aftermarket Spark Plugs
When you shop for spark plugs for your S90, you'll see options from the Original Equipment Manufacturer (OEM) and aftermarket brands. For a critical part like a spark plug, quality is key.
- OEM (Original Equipment Manufacturer): Genuine Volvo spark plugs are often made by reputable brands like NGK or Denso. When you buy a "Genuine Volvo" part, you're getting a plug that is guaranteed to meet the exact specifications for your engine, but often at a higher price.
- Aftermarket Brands: High-quality aftermarket brands like NGK, Denso, and Bosch are excellent alternatives. In many cases, they are the same company that makes the official Volvo part. Choosing an Iridium plug from one of these brands is a reliable and cost-effective choice that will perform just as well as the OEM version. For the S90's high-tech engine, Iridium plugs are recommended for their long life and consistent performance.
Pro Tip: Always use Iridium spark plugs for the 2017-2024 Volvo S90. The turbocharged (T5, T6), supercharged (T6), and hybrid (T8) engines place high demands on the ignition system, and Iridium plugs are designed to handle the stress and provide a long service life.
Cost of Replacing Volvo S90 Spark Plugs
| Part Type | Price Range (Set of 4) |
|---|---|
| New Aftermarket (Bosch, NGK, Denso) | $70 - $129 |
| New OEM (Genuine Volvo) | $94 - $150 |
| Shop Labor | $150 - $250 |
| Total Professional Replacement | $404 - $474 |
Frequently Asked Questions
When should I replace the spark plugs on my Volvo S90?
The recommended replacement interval for the Volvo S90 is typically every 60,000 miles. However, this can vary based on your driving habits. If you frequently drive in stop-and-go traffic or have a Polestar-tuned engine, you may want to inspect them sooner.
Are spark plugs for the T5, T6, and T8 engines different?
No, the T5, T6, and T8 models from this generation all use the same 2.0L 4-cylinder engine platform and generally use the same spark plugs. However, always confirm fitment for your specific vehicle before purchasing. Mild Hybrid models (B5, B6) may require different plugs.
Do new spark plugs need to be gapped?
Most modern Iridium spark plugs from brands like NGK and Denso come pre-gapped from the factory for your specific vehicle. It is not recommended to adjust the gap on these plugs, as you can easily damage the fine Iridium tip.
Can I replace the spark plugs myself?
Yes, this is a DIY-friendly job for someone with basic tools. The process involves removing the engine cover and ignition coils to access the plugs. You will need a specific 14mm thin-walled spark plug socket, as a standard socket will not fit. The job typically takes about one hour.
🎬 Watch: Step-by-step spark plug replacement for the Volvo S90.Helpful Videos
Technical Specifications
OEM Part Numbers: 32290011 31673604 31380014
Socket Size: 14mm Thin-Wall Thread Length: 26.5 mm Material: Iridium Torque Spec: 18 Nm
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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.
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