ModerateAffected: 2012-201950,000–100,000 miles

Volkswagen Golf Mk7 1.4 TSI 125bhp — Ignition Coil Pack Failure

Coil packs break down internally with heat and age, causing severe misfires under load.

Severity

Moderate

DIY Difficulty

Easy

Est. Cost

£50–£150

OBD Codes

P0300P0301P0302P0303P0304

Component Diagram

Engine

Typical layout and location for the Engine assembly.

Reference Illustration

Symptoms

Engine hesitates and jerks when accelerating hard
Flashing EML light during misfire
Rough, lumpy idle
P0301-P0304 fault codes

Root Cause

The insulation inside the pencil coil breaks down due to engine heat. The spark then jumps to the cylinder head instead of crossing the spark plug gap.

How To Fix

Read OBD codes to identify which cylinder is misfiring (e.g., P0302 = Cyl 2).
Swap the coil pack to another cylinder and re-read codes to confirm the coil is at fault.
Replace coil pack (£30-60 each).
Advised to replace spark plugs at the same time.

Estimated Repair Costs

Repair Option	Est. Cost (GBP)
DIY (parts only)	£20–£60
Independent Garage	£50–£150
Main Dealership	£80–£240

Other Faults on This Variant

DSG Mechatronic Unit Failure (DQ200 7-Speed)

Critical

2012-201950,000–100,000 miles£500–£1500

If fitted with the 7-speed dry clutch DSG (DQ200), the mechatronic control unit is highly prone to internal pressure leaks and electrical failure.

Turbo Actuator Wastegate Rattle

Minor

2012-201930,000–90,000 miles£20–£100

A metallic rattling noise from the turbocharger on a cold start or when decelerating is a common annoyance caused by a loose wastegate actuator rod.

Air Conditioning Condenser Leak (Stone Damage)

Minor

2012-201940,000–120,000 miles£250–£450

The air conditioning condenser is mounted at the very front of the cooling pack, making it highly susceptible to stone damage from the road, leading to refrigerant loss.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.