Eccentric shaft sensor leak
Attaches to N52 at engine level · Electrical · carried by 20 variants across 10 chassis
Overview
Eccentric shaft sensor leak is a occasional fault recorded against N52 at engine level, typically from 100–200k km. It shows up as oil seeping from the Valvetronic sensor on the side of the head; in the worst case oil tracks into the wiring. Where it's documented, the repair runs €250–€450 (sensor and seal at an independent, costs dated 2026-07), and it can be checked before you buy. 20 variants across 10 chassis in this database inherit it.
What happens
Symptom. Oil seeping from the Valvetronic sensor on the side of the head; in the worst case oil tracks into the wiring.
Cause. The sensor's seal hardens.
How to check it
Static checks
Look at the intake side of the head for a wet sensor body and oil tracking down the loom.
Engine off, ideally on a lift.
Every variant that carries this
| Variant | Chassis | Body | Years | Risk | Good buy | Cost as % of good buy |
|---|---|---|---|---|---|---|
| 323i N52 | E90 | sedan | 2005–2007 | R2 | €4,050 | 9% |
| 323i N52 | E91 | wagon | 2005–2007 | R2 | €4,300 | 8% |
| 323i N52 | E92 | coupe | 2006–2007 | R2 | €4,650 | 8% |
| 325i N52 | E90 | sedan | 2005–2007 | R2 | €4,750 | 7% |
| 325i N52 | E91 | wagon | 2005–2007 | R2 | €5,050 | 7% |
| 325i N52 | E92 | coupe | 2006–2007 | R2 | €5,450 | 6% |
| 325i N52 | E93 | convertible | 2007 | R2 | €5,350 | 7% |
| 328i N52 | E90 | sedan | 2006–2011 | R2 | €5,150 | 7% |
| 328i N52 | E91 | wagon | 2006–2012 | R2 | €5,450 | 6% |
| 328i N52 | E92 | coupe | 2006–2013 | R2 | €5,950 | 6% |
| 328i N52 | E93 | convertible | 2007–2013 | R2 | €5,750 | 6% |
| 330i N52 | E90 | sedan | 2005–2007 | R2 | €5,600 | 6% |
| 330i N52 | E91 | wagon | 2005–2007 | R2 | €5,950 | 6% |
| 330i N52 | E92 | coupe | 2006–2007 | R2 | €6,450 | 5% |
| 125i N52 | E82 | coupe | 2008–2013 | R2 | €7,000 | 5% |
| 125i N52 | E88 | convertible | 2008–2013 | R2 | €7,400 | 5% |
| 130i N52 | E87 | hatchback | 2005–2011 | R2 | €7,000 | 5% |
| 130i N52 | E81 | hatchback | 2007–2011 | R2 | €6,800 | 5% |
| 530i N52 | E60 | sedan | 2005–2010 | R2 | €5,350 | 7% |
| 530i N52 | E61 | wagon | 2005–2010 | R2 | €5,700 | 6% |
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.