Convertible roof drain blockage and motor water damage
Attaches to E88 at chassis level · Electrical · carried by 8 variants across 1 chassis
Overview
Convertible roof drain blockage and motor water damage is a common fault recorded against E88 at chassis level, typically from 50–160k km. It shows up as water on the seats or carpet and a damp boot, and, the expensive outcome, a roof that won't operate after the electro-hydraulic motor or sensor module is water-damaged. Where it's documented, the repair runs €200–€1,500 (€200–450 to clear drains and seals; far more if the roof motor or module is water-killed, costs dated 2026-07), and it can be partly checked before you buy. 8 variants across 1 chassis in this database inherit it.
What happens
Symptom. Water on the seats or carpet and a damp boot, and, the expensive outcome, a roof that won't operate after the electro-hydraulic motor or sensor module is water-damaged.
Cause. Blocked drain channels and perished seals let water pool in the boot well, where the roof motor and parking-sensor module sit. A soaked motor is the four-figure consequence.
How to check it
On the drive
Fully open and close the roof, listening for the pump straining; lift the boot side-trims and feel for damp around the roof motor, and check the seals for shrinkage.
Include low-speed manoeuvring, not just an open road.
Every variant that carries this
| Variant | Chassis | Body | Years | Risk | Good buy | Cost as % of good buy |
|---|---|---|---|---|---|---|
| 118i N43 | E88 | convertible | 2008–2011 | R3 | €4,200 | 20% |
| 120i N43 | E88 | convertible | 2008–2011 | R3 | €4,650 | 18% |
| 125i N52 | E88 | convertible | 2008–2013 | R2 | €7,400 | 11% |
| 135i N54 | E88 | convertible | 2008–2010 | R4 | €10,350 | 8% |
| 135i N55 | E88 | convertible | 2010–2013 | R3 | €13,300 | 6% |
| 118d N47 | E88 | convertible | 2008–2013 | R4 | €4,950 | 17% |
| 120d N47 | E88 | convertible | 2008–2013 | R4 | €5,550 | 15% |
| 123d N47S | E88 | convertible | 2008–2013 | R4 | €6,950 | 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.