ModerateAffected: 2009-201480,000–150,000 miles

Volkswagen Polo Mk5 1.2 TDI 75bhp — Injector Failure

Injector wear on the 1.2 TDI causes rough running and smoke. The three-cylinder engine runs with high injection pressures that accelerate injector wear.

Severity

Moderate

DIY Difficulty

Professional Only

Est. Cost

£250–£600

OBD Codes

P0201P0202P0203

Component Diagram

Injectors

Typical layout and location for the Injectors assembly.

Reference Illustration

Symptoms

Rough idle and misfire
White smoke on start
Hard starting
P0201-P0203 codes

Root Cause

Three-cylinder engines produce high torque pulses that stress injectors. Worn injectors allow unmetered fuel into the cylinder.

How To Fix

Contribution test to identify failing cylinder
Clean and test before replacing
New injectors need ECU coding
Cost: £200-400 per injector fitted

Estimated Repair Costs

Repair Option	Est. Cost (GBP)
DIY (parts only)	£100–£240
Independent Garage	£250–£600
Main Dealership	£400–£960

Other Faults on This Variant

Timing Belt Failure

Critical

2009-20141–60,000 miles£280–£500

The 1.2 TDI Polo has a timing belt that must be replaced at 60,000 miles or 4 years. Many owners are unaware of this interval — belt failure destroys the engine on this interference unit.

EGR Valve Failure

Moderate

2009-201440,000–80,000 miles£150–£350

EGR failure on the 1.2 TDI Polo is a regular occurrence. The small-displacement engine's EGR system clogs readily in urban use.

DPF Blockage

Moderate

2009-201430,000–70,000 miles£150–£800

The smallest diesel engine VW sell with a DPF is also the most prone to blocking it — the 1.2 TDI Polo simply cannot generate enough heat from urban driving for reliable regeneration.

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