Parts for your 2009 Mitsubishi Outlander-Ignition coils

2009 Mitsubishi Outlander ignition coils — what they do and when to replace them

Per the Mitsubishi Outlander 2007–2013 Workshop Manual (Engine Electrical – Ignition), the Haynes Repair Manual for Outlander (2007–2013), and Mitsubishi parts catalogues, the 2009 Outlander’s petrol engines (2.4L 4B12 and 3.0L 6B31) use coil‑on‑plug ignition coils. Diesel DI‑D variants don’t use ignition coils at all, they rely on compression ignition and glow plugs. So for petrol owners, ignition coils are absolutely relevant kit under the bonnet.

On the petrol models, each cylinder gets its own coil mounted directly on the spark plug. These compact, high‑voltage transformers take the 12V battery feed and step it up to tens of thousands of volts, creating a strong spark to light the air‑fuel mix. The coil‑on‑plug layout keeps the spark clean and consistent, reduces energy loss through leads, and sharpens throttle response and efficiency when everything’s healthy.

There’s no fixed replacement interval for coils, but they benefit from a quick look whenever the Outlander is in for a major service. A smart approach is to replace spark plugs on schedule (typically iridium plugs around the 100,000 km mark, check the service book for the exact interval) because worn plugs make coils work harder and can shorten their life. During servicing, check the coil boots for cracking, signs of arcing (white tracking), loose connectors, and oil in the plug tubes from a rocker cover gasket leak.

Common clues a coil is on the way out include rough idle, hesitation under load, flat spots, increased fuel use, and a blinking or steady check‑engine light. OBD‑II faults often logged are P0300 (random misfire), P0301–P0306 (cylinder‑specific misfire), or P0351–P0356 (coil circuit faults). If a single cylinder is missing, swapping that coil to another cylinder is a quick way to confirm the culprit.

Replacement is straightforward: pop off the engine cover, unplug the connector, remove the small retaining bolt, and pull the coil straight out. Fit quality OEM‑equivalent coils, lightly dab dielectric grease on the boot, and torque the retaining bolt to manufacturer spec (typically around 8–10 Nm). After refitting, clear codes and road‑test. If oil is found in the plug wells, fix the gasket leak first. Many owners keep one spare coil handy to get back on the road fast.

• How many coils? 4 on the 2.4L, 6 on the 3.0L V6, none on the DI‑D diesel.
• Tip: Coils and plugs are a team — healthy plugs help coils live longer.

FAQ

How many ignition coils are in a 2009 Mitsubishi Outlander?
Petrol models use one coil per cylinder: four coils on the 2.4‑litre four‑cylinder and six coils on the 3.0‑litre V6. Diesel DI‑D versions don’t use ignition coils at all, they use glow plugs and compression ignition, so they’re a different setup entirely.

When should the ignition coils be replaced?
There’s no set interval. Replace coils when there are misfires, hesitation, poor fuel economy, or fault codes like P030x/P035x. It’s wise to inspect coils whenever spark plugs are changed. Keeping fresh iridium plugs in the engine reduces coil stress and helps them last longer.

Can the Outlander be driven with a bad ignition coil?
It might run, but it’s not a good idea. Driving with a misfire can damage the catalytic converter, increase fuel use, and leave them stranded. If the check‑engine light is flashing, it’s best to stop driving and sort it promptly.