Parts for your 2012 Nissan Navara-Ignition coils

2012 Nissan Navara ignition coils — what’s fitted and how to look after them

Based on factory documentation, ignition coils are fitted to the 2012 Nissan Navara when it’s powered by a petrol engine, and not fitted on diesel variants. The Nissan D40 Series Service Manual for QR25DE (2.5 petrol) and VQ40DE (4.0 petrol) details a Direct Ignition System with a coil-on-plug at each cylinder. In contrast, the D40 YD25DDTi (2.5 turbo-diesel) and V9X (3.0 V6 turbo-diesel) engine manuals describe compression ignition with glow plugs for cold starts and no spark or ignition coil system. Nissan parts catalogues back this up by listing coils for the petrol engines and none for the diesels.

For diesel 2012 Navara models, ignition coils aren’t used because diesel engines ignite the air–fuel mix using heat from compression rather than a spark. The engine control module manages injection timing and quantity, and glow plugs assist only with cold starting. With no spark plugs, there’s no requirement for ignition coils on YD25DDTi or V9X-powered Navaras.

For petrol 2012 Navara models (QR25DE and VQ40DE), the ignition coils do the heavy lifting in the spark system. Each coil sits directly on its spark plug, transforming the 12-volt supply into the high voltage needed to fire the plug precisely when the ECU commands it. Coil-on-plug design helps improve spark energy, reduces losses through leads, and sharpens timing control — all good news for smooth running, power and fuel economy.

There’s no hard-and-fast replacement interval for coils, they’re serviced on condition. A good habit is to inspect them whenever the spark plugs are changed per Nissan’s schedule. If there’s a misfire under load, rough idle, hard starting or the check engine light with a P030X code, a failing coil is a prime suspect. A quick swap test (moving a coil to another cylinder and seeing if the fault follows) can help confirm the culprit.

• Keep the battery healthy — low system voltage stresses coils.
• Check for oil in the plug tubes (often from rocker cover seals) and fix leaks promptly, oil contamination cooks coils and boots.
• Use quality, correct-spec plugs and keep gaps in check, over-gapped plugs make coils work harder.
• When refitting, seat coils squarely and click the connectors home, a dab of dielectric grease on boots helps future removal.
• If one coil fails on a high-kilometre engine, replacing the affected unit is fine, but doing the full set can save repeat visits if the rest are the same age.

Don’t keep driving through a misfire — unburnt fuel can overheat the catalytic converter. Sort a weak or dead coil quickly and the Navara will get back to pulling like it should.

Popular questions

Which 2012 Navara engines have ignition coils?
Petrol versions — the QR25DE 2.5 and VQ40DE 4.0 — use a coil-on-plug system with one coil per cylinder. Diesel versions — the YD25DDTi 2.5 and V9X 3.0 V6 — don’t use ignition coils at all because they’re compression-ignition engines with glow plugs only for cold starts.

How often should ignition coils be replaced on a 2012 Navara?
There’s no routine interval. Coils are replaced when they show symptoms like misfires, rough idle or a check engine light. Inspect them whenever the spark plugs are due, and consider proactive replacement on high-kilometre petrol engines if multiple coils are weakening.

Should all coils be replaced at once if one fails?
It’s acceptable to replace just the failed coil, especially on lower-kilometre vehicles. On older, higher-kilometre petrol Navaras, many owners opt to replace the full set to avoid chasing sequential failures, particularly if signs of heat or oil contamination are present.