The Quick Answer above is the generic definition. What follows is the model-specific detail for the Ford models that log P0354.
DTC/P0354·Ford
P0354 on Ford: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeverityNot safe to driveFord
P0354 on a Ford means the ECU saw an electrical fault in the primary or secondary circuit driving ignition coil #4. Cylinder 4 isn't getting reliable spark, so expect a misfire and a flashing CEL under load.
Typical repair cost, all makes€48 - €1450
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Ford F-150
2004-20145.4L 3V Triton is notorious for coil-on-plug failure. Replace the coil and the plug together on the affected cylinder, and use anti-seize on the plug threads: the 3V head is aluminium and the plugs are known to seize.
What causes P0354 on a Ford?
Beyond the generic causes listed on the main P0354 page, these are the patterns noted for Ford models:
Ford F-150Cracked coil boot arcing to the plug well
Ford F-150Two-piece spark plug breaking off in the head during removal
Ford F-150Water intrusion after washing the engine bay
How to diagnose P0354 on a Ford with OBD2
Follow these steps to pinpoint the root cause of P0354:
- Read all stored codes. Note any P030X misfire codes or other coil circuit codes for context.
- Swap coil #4 with coil #1 or #2, clear codes, and drive. If the fault follows the coil, replace it.
- Pull spark plug #4 and inspect gap, electrode wear, oil, fuel, or carbon fouling.
- Unplug the coil connector and check for bent pins, green corrosion, or oil contamination.
- Key on, engine off: confirm battery voltage on the coil power pin against a known good ground.
- Back-probe the ECU trigger wire while cranking and confirm a switching signal with a scope or noid/LED test light.
- Measure primary resistance (typically 0.4 to 2 ohms) and secondary (5k to 15k ohms) against factory spec.
- If coil, plug, connector, and wiring all pass, suspect the ECU driver circuit for cylinder 4.
How much does P0354 cost to fix on a Ford? (EUR)
Estimated repair costs for P0354 in EUR, compiled across makes. Expect Ford parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0354
These codes are often seen alongside P0354 or point to related issues, on any make:
Looking for the full P0354 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0354 guideSkanyx · Ford
Diagnose P0354 on your Ford
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