Parts for your 2002 Nissan Serena-Ignition coils

2002 Nissan Serena ignition-coils: what they do and when to replace them

Technical references including the Nissan C24 Serena service manual (EC/EM sections) and Nissan FAST parts catalogue show that 2002 petrol Serena models with QR20DE or QR25DE engines use individual coil-on-plug ignition coils (commonly listed under Nissan ignition coil assemblies). These sources also note that the YD22DDTi diesel variant is equipped with glow plugs and has no spark-ignition system, so there are no ignition coils on the diesel.

For owners of the YD22DDTi diesel Serena: ignition coils aren’t used because diesels ignite fuel by compression, not a spark. They rely on glow plugs for cold starts, so servicing focuses on fuel, air, and glow plug systems rather than coils.

For petrol Serena drivers, the ignition coils are the unsung heroes under the bonnet. Each coil sits directly on its spark plug, turning the 12-volt supply into a massive high-voltage spark at just the right moment. The engine control unit times these sparks for clean combustion, smooth running, and decent fuel economy. When a coil weakens, the Serena can feel a bit doughy—misfires, rough idle, sluggish take-off, and sometimes a flashing check engine light are the usual signs.

There’s no fixed replacement interval for coils on the 2002 Serena. They’re typically replaced as needed, often around higher kilometres, especially in hot climates. It’s smart to inspect them whenever spark plugs are changed (often around 100,000 km for iridium plugs if fitted). Look for oil in the plug wells from a rocker cover gasket seep, heat-cracked boots, or corrosion on the terminals—those are coil killers.

• Common symptoms: misfire under load, rough idle, hard cold starts, poor fuel economy, and codes like P0300–P0304 or P0350-series.
• Usual causes: heat soak, age, oil contamination, moisture in plug tubes, or cheap plugs with the wrong gap.

When replacing, use quality coils (genuine or reputable aftermarket) and correct-spec spark plugs. Swap one coil to confirm a suspect cylinder if you’re diagnosing at home—if the misfire follows the coil, you’ve found the culprit. Keep the plug tubes dry, address any cam cover gasket leaks, and use a dab of dielectric grease on the boot to help sealing. Tighten spark plugs and coil hold-down bolts to the service manual spec, and don’t yank coils out by the wiring—use a gentle twist and pull. After fitting, clear codes with a scan tool and take it for a decent road test to confirm it’s all sweet.

1. Check for oil or water in plug wells, fix leaks first.
2. Verify plug condition and gap, use the correct heat range.
3. Test coils by cylinder swap or with a scope if available.
4. Replace the failed coil, and consider doing the set on high-kilometre, original units.

Sorted coils keep the Serena running smoothly, using less fuel, and treating the catalytic converter kindly—so it’s well worth keeping on top of them.

Does a 2002 Nissan Serena have ignition coils?

Petrol models with QR20DE or QR25DE engines do—each cylinder has its own coil-on-plug unit as outlined in the Nissan C24 service manual and parts listings. The YD22DDTi diesel version doesn’t use ignition coils at all.

How often should ignition coils be replaced?

There’s no scheduled interval. Coils are replaced on condition—usually when misfires or fault codes pop up. Inspect them whenever you do spark plugs (around 100,000 km for many iridium setups) and replace any that test weak or show damage.

Can a bad ignition coil damage the catalytic converter?

Yes. A persistent misfire can let unburnt fuel hit the cat, overheating and damaging it. Fix coil-related misfires promptly to avoid pricey exhaust repairs.