A generic coil circuit fault where the ECU has not identified which cylinder. Usually a coil, a plug lead or a wiring fault common to the pack.
P0350 — also written PO35O, P 0350, 0350 — is the OBD-II code for ignition coil primary/secondary circuit. Same code, same fix: this page covers every spelling of it.
P0350 is a engine fault code, typically costing £70–£480 to put right in a UK garage.
What causes P0350?
- Failed ignition coil
- Damaged coil harness connector
- Water in the plug wells
- Chafed coil supply wire
How P0350 is fixed
- Test each coil's primary resistance
- Replace the faulty coil and its connector
- Dry and reseal the plug wells
- Fit plugs at the same time if overdue
P0350 repair cost in the UK
Most P0350 repairs land between £70–£480 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P0350?
Drive gently and briefly. A flashing engine light means an active misfire that will damage the catalytic converter.
Urgency: high.