Parts for your 2016 Ford Mondeo-Ignition coils

2016 Ford Mondeo ignition coils — what they are, when they’re needed, and how to look after them

Technical references confirm ignition coils are fitted to the 2016 Ford Mondeo when it’s running petrol EcoBoost engines, but not on diesel TDCi variants. The Ford Workshop Manual for the CD391 Mondeo (Section 303-07A: Ignition System, 2015–2018) details coil-on-plug units for the 1.5L and 2.0L EcoBoost. Ford’s ETIS/Microcat parts catalogues list individual coils for those petrol engines. Conversely, the diesel chapters focus on glow plugs and compression ignition with no ignition coils specified. So, ignition coils are relevant for petrol Mondeos and not applicable to diesel models.

On petrol versions, each cylinder gets its own coil-on-plug unit. The job’s simple but critical: take the 12-volt supply and step it up to tens of thousands of volts to fire the spark plug cleanly under all loads. A healthy set of coils gives crisp starts, smooth idle, decent fuel economy, and keeps emissions gear happy.

There’s no fixed replacement interval for coils on a Mondeo, but they live in a hot spot under the bonnet and work hard. As a practical servicing approach in Australia and New Zealand, coils should be inspected whenever spark plugs are changed (often 60,000–100,000 km depending on plug type and driving conditions). Look for cracking, heat discolouration, oil contamination in the plug wells, or carbon tracking on the boots. Any misfire codes or rough running under load are a cue to test and potentially replace the suspect unit.

• Common signs a coil is on the way out: rough idle, hesitation, higher fuel use, engine light on, sulphur smell from the exhaust, and OBD-II codes like P0300–P0304 (misfires) or P0351–P0354 (coil circuit).
• Quick checks: scan for codes, inspect connectors and wiring, swap the suspect coil to another cylinder to see if the misfire follows, and check the plug in that cylinder for wear or incorrect gap.

When replacing, it’s smart to fit new spark plugs at the same time so the fresh coil isn’t forced to fire through a tired plug. Use quality parts, keep the coil boots clean and lightly dressed with appropriate dielectric grease, and tighten plugs and coil bolts to the factory spec (don’t overdo it). Disconnect the battery negative before unplugging coils to avoid electrical spikes, and seat each coil squarely on the plug. For diesel Mondeos, skip coils entirely — glow plugs and their control module are the relevant service items.

Does a 2016 Ford Mondeo diesel have ignition coils?

No. Diesel TDCi models use compression ignition and glow plugs for cold starts, so there are no ignition coils. The Ford Workshop Manual sections for diesel outline glow plug diagnostics instead of any ignition-coil systems.

How long do Mondeo ignition coils last on petrol EcoBoost engines?

They often run well past 100,000 km, but heat, vibration and oil contamination can shorten life. If misfires appear, fuel economy drops, or codes point to a specific cylinder, test and replace that coil. Checking coils whenever plugs are replaced is a sensible routine.

Is it okay to drive with a misfiring coil?

Not ideal. Unburnt fuel can overheat the catalytic converter and damage it, and the engine will run rough and use more fuel. If a misfire shows up, it’s best to diagnose promptly and replace the faulty coil and any worn spark plugs.