Quick answer: Spark Plug Replacement on a 2019–2024 Volvo XC40 is rated Advanced and takes about 1–2 hours. You'll need 3 tools for this job, and parts cost about $115. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Correct spark plug set for the gasoline/ICE engine in 2019-2024 Volvo XC40; verify engine, heat range, gap, and VIN fitment |
— |
$115.00 |
|
| Coil-boot seals or ignition coils only if inspection finds damage Optional |
— |
$35.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Confirm your Drive-E engine and locate the coils
Every gasoline XC40 in the 2019–2024 range uses a 2.0-liter Drive-E four-cylinder: the T4/T5 (2019–2020) and the B4/B5 48-volt mild hybrid (2021+). The plug job is identical across all of them — just make sure the car is fully off (on B4/B5 models, no start-stop cycling) and leave all hybrid hardware completely alone. Open the hood with the engine cold: the four individual coil-on-plug units sit in a neat row on top of the engine, front and center. Gather a ratchet with metric sockets and extensions, a thin-wall 14mm spark-plug socket, a feeler gauge, and dielectric grease.
2
Lift off the engine cover
The one-piece plastic engine cover lifts straight off its friction studs — pull up evenly with both hands rather than prying from one corner, which cracks the mounting studs. That's the entire access procedure: no intake, cowl, or ducting needs to come off, which makes the XC40 one of the easier cars on this list. Blow any loose dust away from the coil area before you disturb the connectors.
🔧 Mechanic's note — Tom Becker
I know small thing, big difference: The one-piece plastic engine cover lifts straight off its friction studs — pull up evenly with both hands rather than prying from one corner, which cracks the mounting studs.
3
Disconnect and remove the ignition coils
Each coil connector has a small locking tab — press it and rock the connector straight off, supporting the connector body rather than pulling the wires. Remove the single hold-down bolt from each coil and lift the coil straight up out of its well, twisting gently if the boot is stuck to the plug. Inspect the rubber boots for cracks, swelling, or carbon tracking (thin dark lines), and replace any coil or boot that looks compromised. Keep the coils in order so each returns to its original cylinder.
🔧 Mechanic's note — Ray Delgado
I've been burned enough times that I always do yourself a favor here: Inspect the rubber boots for cracks, swelling, or carbon tracking (thin dark lines), and replace any coil or boot that looks compromised.
4
Remove the old plugs with a 14mm thin-wall socket
Blow compressed air or vacuum out each plug well before removing plugs so debris can't fall into the cylinders. The Drive-E engine uses smaller 14mm-hex spark plugs set in narrow wells, so use a thin-wall 14mm spark-plug socket — a standard 5/8-inch socket won't fit. Seat the socket squarely on each plug and loosen counterclockwise, lifting the plug straight out. Keep the old plugs in order and compare them; one plug that looks very different from the others can flag a cylinder-specific issue. If a plug binds, ease it back and forth gently.
5
Install the new plugs (no re-gapping)
Install only the plug type specified for your engine in the owner's manual. These are fine-wire iridium or platinum plugs: check the gap with a wire-style feeler gauge against the specification in the manual or on the underhood emissions sticker, but do NOT attempt to re-gap them — prying on fine-wire electrodes cracks the tips, and new plugs come correctly pre-gapped. Thread every plug in by hand with just the extension (no ratchet) until it turns freely, then seat it per the plug manufacturer's instructions; overtightening strips the aluminum head. Use anti-seize only if the plug maker calls for it — most modern plugs are pre-coated and install dry.
🔧 Mechanic's note — Tom Becker
Trust me on this one: Thread every plug in by hand with just the extension (no ratchet) until it turns freely, then seat it per the plug manufacturer's instructions; overtightening strips the aluminum head.
6
Reassemble coils and engine cover
Press the engine cover straight back down onto its friction studs with even pressure. Do a final check that every connector is seated and no tools or rags remain in the bay.
7
Verify the repair
Reconnect the 12V battery if you disconnected it, then start the engine — it should idle smoothly with no shake or check-engine light. Take a short test drive with some normal acceleration; a misfire shows up as a stumble or a P0301–P0304 code, and is usually a coil connector that didn't fully click home. If a code appears, recheck the connectors before suspecting parts. These are long-life plugs — follow the replacement interval in your owner's maintenance schedule for the next change.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Using a standard 5/8-inch spark-plug socket that won't fit the 14mm-hex plugs or the narrow plug wells — get a thin-wall 14mm socket first.
- • Cracking the engine cover's mounting studs by prying it off unevenly — pull straight up with even pressure.
- • Forcing a coil connector off without pressing its locking tab, and breaking the tab.
