Quick answer: Spark Plug Replacement on a 2010–2024 Mercedes-Benz Sprinter is rated Advanced and takes about 1-3 hours. You'll need 4 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 2010-2024 Mercedes-Benz Sprinter; 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 engine and plug fitment
Confirm a gasoline engine. The 3.5L M272 V6 (2010–2018) takes NGK laser-iridium plugs gapped 0.032 in (buy 6); the 2.0L M274 turbo (2019+) takes NGK SILZKFR8H7S-type indexed plugs gapped 0.028 in (buy 4) — no alternatives. Scan for P0300-series misfires.
🔧 Mechanic's note — Ray Delgado
My two cents on this step: Buy by the engine code, not the year — a late 2018 M272 and an early 2019 M274 take completely different plugs. The VIN or the engine cover tells you which.
2
Cool and expose the plugs
Cool the engine completely and disconnect the negative battery cable. Remove the air intake pipe and lift off the coil covers. The M272's six coils and the M274's four sit on top of the heads in plain view once the covers are off.
3
Remove coils and clean wells
Unplug each coil connector, remove the coil bolts, and lift the coils straight out. Blow or brush every plug well clean first. Per Mercedes workshop instructions, apply connector grease to the sealing lips of each coil boot before installation.
4
Remove and install plugs
Remove the old plugs and compare reach and wear. The M272 uses a 5/8 in socket; the M274's M12 plugs need a 14mm socket. Start each new plug by hand, then torque to 23 N·m per the Mercedes WIS procedure for these engines. No anti-seize on the coated threads; verify the gap (0.032 in M272, 0.028 in M274) without touching finewire tips.
🔧 Mechanic's note — Tom Becker
I've learned this the hard way: Start every plug by hand, and if one binds, back it out — cross-threading an aluminum head turns a Saturday job into a machine-shop bill.
5
Reconnect and verify
Reinstall the greased-boot coils, reconnect everything, and refit the intake pipe and covers. Reconnect the battery, start the Sprinter, and scan for misfires. Both engines should idle smoothly; a lingering miss is almost always an unseated coil connector.
🔧 Mechanic's note — Ray Delgado
I've trained my ears for this one: A lingering miss after the job is the coil connector, not the plug. Push each one until you feel it click home.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Using the wrong plug or assuming a pre-gapped plug needs no verification
- • Blowing debris into an open cylinder or plug well
- • Cross-threading a plug or tightening it without a torque wrench
- • Overusing anti-seize or dielectric grease on the plug threads
- • Mixing coil connectors or ignoring a misfire after reassembly
