P0354 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.
Scan your own car in about 60 seconds: see whether P0354 is really what it has, how urgent it is, and what the fix should cost. Free on iPhone and Android, on any ELM327 adapter.
Get Skanyx freeP0354 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.
P0354 is a ignition-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0354 and illuminates the check engine light.
If your vehicle has triggered P0354, you may notice one or more of these symptoms:
Here are the most common causes of P0354:
No - address this immediately. You can limp home, but unburned fuel dumps into the exhaust and cooks the catalytic converter. Fix within a day or two, not weeks.
Follow these steps to pinpoint the root cause of P0354:
Repair costs for P0354 vary depending on the root cause and your vehicle. Here are typical estimates:
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Full repair guides
P0354 behaves differently depending on your vehicle. Select your car below for model-specific causes and known issues:
1.4 TSI (CAVD/CTHD) and 2.0 TFSI (BPY, CCTA) engines have used several coil versions, so fit the current version for your engine code, as a set rather than just cylinder 4.
These codes are often seen alongside P0354 or indicate related issues:
Coil D is cylinder 4 on virtually every application. On inline engines count from the front (timing) end. On V engines check the firing order and bank layout in the service data, since cylinder numbering isn't the same across manufacturers.
Yes, and it's the fastest test on the car. Move coil 4 to another cylinder, clear the code, and drive. If the code jumps to the new cylinder, the coil is bad. If P0354 stays, look at the plug, connector, or wiring.
Yes if you keep driving on it. Raw fuel entering a hot cat overheats the substrate and melts it. A €60 coil now beats a €900 catalyst later, which is why the ECU flashes the CEL during an active misfire.
Usually one of three things: the replacement coil is defective out of the box, the spark plug is fouled or gapped wrong, or there's a broken wire or bad pin in the connector that's still cutting the trigger signal.
No. A dead injector on cylinder 4 typically sets P0204 or a cylinder-4 misfire (P0304). P0354 is strictly an ignition primary or secondary circuit electrical fault, not a combustion or fuel fault.
A 15 euro Bluetooth adapter and a free phone app read the exact fault code a shop charges 30 to 100 euros to pull. Here is how to do it yourself in 5 minutes.
A flashing check engine light means the engine is misfiring right now. Pull over and read the code: the fix is usually $80 to $400, the delay costs $1,500 up.
An unfamiliar symbol just lit up and you need to know whether to stop. Read the colour first, then find your symbol in the table: every one carries its verdict.
Your car logged P0354. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €48-€1450 repair range so you know the number before a shop quotes you. Free on iPhone and Android, and you do not need to be a mechanic to read it.
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