Parts for your 2006 Nissan Navara-Ignition coils

Ignition coils on a 2006 Nissan Navara: used on petrol, not used on diesel

Based on manufacturer documentation, whether a 2006 Nissan Navara uses ignition coils depends on the engine. The D40 petrol models (e.g., VQ40DE 4.0 V6) use coil-on-plug ignition coils, this is detailed in the Nissan Navara D40 Service Manual under the VQ40DE Engine Control/Ignition System section, which specifies an individual coil per cylinder. By contrast, the D40 diesel models (e.g., YD25DDTi 2.5) are compression-ignition engines and therefore do not use ignition coils, the Diesel Engine sections of the same service manual describe a glow plug system and common-rail injection with no spark ignition hardware. Nissan’s parts catalogues also list ignition coil assemblies for VQ40DE petrol variants but none for YD25DDTi diesels. Aftermarket catalogues from major ignition suppliers align with this split.

For owners of petrol 2006 Navara models fitted with ignition coils, these little units do a big job. Each coil sits right on top of a spark plug (coil-on-plug), turning the battery’s low voltage into the high-voltage zap that lights the air–fuel mix. Healthy coils mean crisp starts, smooth idle, decent fuel economy and solid pulling power.

They’re generally low-maintenance, but they do live a hard life in heat and vibration. As part of routine servicing, it’s smart to check coil connectors for corrosion or broken clips, look for oil in the plug tubes (a sign of rocker cover gasket leaks that can kill coils), and keep the engine cover vents clear so heat can escape. When you’re doing spark plugs (often around the 100,000 km mark for iridium plugs, per plug manufacturer guidance and local service schedules), pop the coils out and give them a once-over. If the boots are cracked or swollen, replace them with quality parts.

• Common symptoms of a failing coil: rough idle, sluggish take-off, misfire under load, poor economy, and a flashing MIL with codes like P030X. On the V6, a quick “swap test” (moving a suspect coil to another cylinder) can help confirm the fault.
• Best practice is to replace any dud coil promptly. Driving for long with a misfire can overheat the catalytic converters and cost far more than a new coil.
• There’s no strict replacement interval, coils are replaced as needed. Many last well past 150,000–200,000 km if the plugs and seals are kept in good nick.

If their 2006 Navara is a diesel (YD25DDTi), ignition coils aren’t fitted at all because diesels ignite fuel by compression rather than a spark. Rough running on those is more likely glow plugs, air leaks, fuel delivery, or injector concerns.

How many ignition coils are in a 2006 Navara petrol?

On the VQ40DE 4.0 V6 petrol, there are six coil-on-plug units—one per cylinder. Each coil fires its own spark plug for precise control and strong spark energy.

How often should ignition coils be replaced?

There’s no set time or kilometre interval. Replace coils when they show faults (misfire, codes, poor running). Inspect them whenever spark plugs are changed—typically around 100,000 km for many iridium-equipped petrol Navaras—so any ageing boots or heat damage can be sorted before it causes trouble.

Is it okay to keep driving with a misfiring coil?

It’ll usually still run, but it’s not a good idea. Unburnt fuel can overheat and damage the catalytic converters and may foul the oxygen sensors. It’s safer (and cheaper long term) to fix the misfire promptly.