Car Model Guide/ Issues/ Roof drain blockage and boot water ingress

Roof drain blockage and boot water ingress

Attaches to E93 at chassis level · Body & corrosion · carried by 11 variants across 1 chassis

Overview

Roof drain blockage and boot water ingress is a common fault recorded against E93 at chassis level, at any age. It shows up as water in the boot or rear footwells, damp smell, corroded connectors under the carpet. Where it's documented, the repair runs €150–€900 (drain clearing at the low end; carpet, modules and connectors at the high end, costs dated 2026-07), and it can be checked before you buy. 11 variants across 1 chassis in this database inherit it.

€150 – €900
drain clearing at the low end; carpet, modules and connectors at the high end · costs dated
Likelihoodcommon
Typical onsetany age
Detectableyes
Walk awayno
Evidencedocumented

What happens

Symptom. Water in the boot or rear footwells, damp smell, corroded connectors under the carpet.

Cause. The convertible's drain channels block, and the water goes into the car.

How to check it

Static checks

Lift the boot carpet and the spare wheel cover, and press the rear footwell carpets with your palm. Damp here on a convertible is the start of an electrical problem, not the end of a cosmetic one.

Engine off, ideally on a lift.

Body & corrosioncommonDetectable at viewingevidence: documented

Every variant that carries this

VariantChassisBodyYearsRiskGood buyCost as % of good buy
320i N43E93convertible2007–2011R4€4,45012%
325i N52E93convertible2007R2€5,35010%
325i N53E93convertible2007–2013R4€5,9009%
328i N52E93convertible2007–2013R2€5,7509%
330i N53E93convertible2007–2011R4€6,7508%
335i N54E93convertible2007–2010R4€8,2506%
335i N55E93convertible2010–2013R3€13,1004%
320d N47E93convertible2007–2013R5€4,95011%
330d M57E93convertible2007–2008R2€6,7008%
330d N57E93convertible2008–2013R3€8,7506%
M3 S65E93convertible2007–2013R4€30,8002%

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.