Parts for your 2007 Nissan Primera-Ignition leads

2007 Nissan Primera ignition leads — are they fitted, and what to do instead

For the 2007 Nissan Primera (P12 series), traditional ignition leads (high-tension leads/HT leads) aren’t used. The petrol engines offered in this model, notably the QG18DE 1.8 and QR20DE 2.0, run a direct, coil-on-plug ignition setup where each spark plug has its own “pencil” ignition coil. Diesel variants don’t use spark plugs at all, so there are no ignition leads there either.

This isn’t just workshop chatter. Nissan’s Electronic Service Manual for the P12 specifies a direct ignition system with individual coils on each cylinder and makes clear that spark plug cables aren’t part of the design. Major parts catalogues for the P12 list ignition coil assemblies (commonly in the 22448-**** family) but no HT lead sets (which would usually sit under 22440-**** if they existed for the model). Likewise, aftermarket application catalogues (NGK, Bosch, etc.) list coil-on-plug units and spark plugs for the P12 petrol engines, but no lead sets. General service data providers also show no scheduled replacement item for ignition leads on this vehicle.

Why did Nissan go this way? Coil-on-plug reduces energy loss compared with a long HT lead, improves spark accuracy, cuts radio interference, and cleans up packaging under the bonnet. It also means there’s one less maintenance item on the service list — handy for owners who’d rather spend less time chasing misfires.

So, if a 2007 Primera is missing, idling rough, or throwing an ignition-related code, the usual suspects aren’t HT leads. The smart checks are:

• Inspect and test the individual ignition coils (look for cracking, oil ingress, weak output).
• Replace worn spark plugs (iridium/platinum plugs commonly last up to ~100,000 km in these engines, but heat cycles and fuel quality matter).
• Check the coil boots and connectors for corrosion, looseness, or carbon tracking.
• Verify engine earths and battery health, as low system voltage can aggravate coil performance.

Owners shopping for “ignition leads” for a 2007 Primera will come up empty for good reason. What they actually want on the shelf are the correct spark plugs and, if needed, replacement coil-on-plug units. That’s the right way to restore crisp starts and smooth running on a P12.

Technical sources referenced (no external links provided):

• Nissan Primera P12 Electronic Service Manual (Ignition/Engine Control sections) — specifies direct, coil-on-plug ignition and no spark plug cables.
• Nissan Electronic Parts Catalogue (EPC/FAST) — lists individual ignition coil assemblies for P12 petrol engines and no HT lead set.
• Aftermarket application catalogues (e.g., NGK, Bosch) — list COP coils and spark plugs for P12 petrol engines, no ignition lead kits.
• Service data providers — no scheduled HT lead replacement item for P12, spark plug replacement only.

Popular questions

Does a 2007 Nissan Primera have ignition leads?
No. Petrol P12 models use coil-on-plug ignition, so there are no separate HT leads. Diesel versions don’t use spark plugs at all. If there’s a misfire, look to the coils, plugs, or connectors instead of hunting for leads that aren’t there.

What should be replaced instead of ignition leads on a 2007 Primera petrol?
Spark plugs and, if needed, the individual coil-on-plug units. Iridium/platinum plugs typically last up to around 100,000 km, but condition depends on driving and fuel quality. A weak or cracked coil can cause intermittent misfires, especially under load.

How can they tell if a coil-on-plug unit is failing?
Signs include rough idle, hesitation under acceleration, poor fuel economy, and a flashing or steady check engine light. Scan tool data will often flag a cylinder-specific misfire. A swap test (moving a coil to another cylinder) can help confirm a suspect unit, and visual checks may reveal cracking or carbon tracking on the coil boot.