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NN4 Online
Free mainland UK delivery on orders of £40 or more
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Spark Plugs

Finding parts that fit your vehicle.

Find Spark Plugs for your vehicle

Enter your reg and we'll show you only parts that fit — no guesswork.

UK
Don't know your reg? Find manually
  • ✓ Free delivery on orders over £40
  • ✓ UK stock, dispatched from Northampton
  • ✓ Filtered to your specific vehicle from DVLA data
Top brands in Spark Plugs
Bosch Denso

About Spark Plugs

NN4 Online stocks a wide range of spark plugs from established manufacturers including Bosch and Denso. Enter your registration above and we'll narrow the list to spark plugs that match your vehicle in the TecDoc catalogue. We always recommend confirming the part dimensions against your existing component before fitting, as specifications can vary between trim levels and engine variants.

All stock dispatches from our Northampton warehouse with free standard delivery on orders over £40 to most UK mainland locations. Browse the full spark plugs catalogue below, or use the registration lookup to filter to parts matched to your vehicle.

Frequently asked

How do I know a part will fit my car?

Enter your registration above and we cross-check against the TecDoc catalogue to narrow the list to spark plugs listed against your vehicle. Specifications can still vary between trim levels and engine variants, so we recommend confirming the part dimensions against your existing component before fitting.

What brands do you stock?

We stock established manufacturer brands sourced through trade channels. The brand row at the bottom of this page shows which manufacturers we carry for spark plugs. We don't sell unbranded parts.

How quickly will my order arrive?

Most orders dispatch from our Northampton warehouse within 1–2 working days. Free standard delivery on orders over £40 to most UK mainland locations.

What if the part doesn't fit?

Please check our returns policy for the current terms. If you're unsure about fitment for your specific vehicle variant, please contact our team before ordering using the details at the bottom of the site.

Can I check fitment before ordering?

Yes — every product page shows whether the part is listed against your selected vehicle. Where multiple sizes exist for the same vehicle, the dimensions are shown so you can compare against your existing part. If you're unsure, contact our team for help confirming the right option.

Brands for Spark Plugs

We stock spark plugs from these manufacturers — each linked to a dedicated brand page with the full range:

Bosch Bosch Denso Denso

About Spark Plugs

Our spark plugs range is built from established UK suppliers and trusted aftermarket brands. Each product is mapped against OE/OEM references and TecDoc ktype data so the reg-lookup above filters to only the parts that fit your specific make, model, engine and trim.

Enter your registration to see exact-fit options — or browse by brand using the tiles above. The full catalogue covers most major makes and models on UK roads, with same-business-day dispatch on stock items ordered before 2pm.

When to replace your filters

Filters are service-interval parts — oil, air, fuel and cabin filters all have manufacturer-specified replacement intervals, typically every 15,000-30,000 km or annually, whichever comes first. Skipping a filter change can cost more in engine wear and reduced fuel economy than the part itself.

Common signs a filter needs changing

  • Reduced acceleration or fuel economy — restricted air filter limiting intake.
  • Engine misfires — a clogged fuel filter starving the injectors.
  • Cabin air feels stale or musty — pollen filter saturated.
  • Oil pressure warnings — restricted oil filter, or a bypass valve issue.

Choosing the right filter

Filters are tightly engine-specific — even within the same model year, different fuel-system variants use different parts. Our reg-lookup maps to the exact OE part number for your engine code, so you can be confident the cross-reference works before you order.

Why buy from NN4 Online

  • Reg-lookup fitment — see only the parts mapped to your specific vehicle.
  • UK warehouses — most stock items dispatch same business day on orders before 2pm.
  • Established brands — the brand tiles above are the full list available in this category.
  • Standard returns — handled per our returns policy linked in the footer.

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