Pump-duse injector loom chafing
Attaches to BKC at engine level · Electrical · carried by 3 variants across 3 chassis
Overview
Pump-duse injector loom chafing is a occasional fault recorded against BKC at engine level, typically from 150–300k km. It shows up as misfire, rough running, intermittent injector codes that move between cylinders. Where it's documented, the repair runs €150–€450 (loom replacement at an independent, costs dated 2026-07), and it can be partly checked before you buy. 3 variants across 3 chassis in this database inherit it.
What happens
Symptom. Misfire, rough running, intermittent injector codes that move between cylinders.
Cause. The wiring loom to the pump-duse injectors runs under the rocker cover and chafes with age and heat.
Sources. specialist reports
How to check it
OBD scan
Scan for injector codes; intermittent faults that wander between cylinders point at the loom rather than the injectors.
Mandatory. A seller who refuses a scan has answered the question.
Every variant that carries this
| Variant | Chassis | Body | Years | Risk | Good buy | Cost as % of good buy |
|---|---|---|---|---|---|---|
| 1.9 TDI BKC | Mk5 | hatchback | 2003–2009 | R2 | €2,000 | 15% |
| 1.9 TDI BKC | 8P | hatchback | 2003–2010 | R2 | €2,450 | 12% |
| 1.9 TDI BKC | 8PA | hatchback | 2004–2010 | R2 | €2,500 | 12% |
The last column is the point. The same repair is an inconvenience on one variant and a reason to scrap the car on another. A failure costing a quarter of the vehicle's value changes the purchase decision regardless of how rare it is.