Car Model Guide/ Issues/ Corrosion at the rear subframe and arch seams

Corrosion at the rear subframe and arch seams

Attaches to E9X at chassis level · Body & corrosion · carried by 65 variants across 4 chassis

Overview

Corrosion at the rear subframe and arch seams is a occasional fault recorded against E9X at chassis level, at any age. It shows up as bubbling at the rear arch lip, scaling on subframe mounting points and rear suspension components. Where it's documented, the repair runs €300–€2,000 (arch repair at the low end; structural subframe work at the high end, costs dated 2026-07), and it can be checked before you buy. 65 variants across 4 chassis in this database inherit it.

€300 – €2,000

arch repair at the low end; structural subframe work at the high end · costs dated 2026-07

Likelihoodoccasional

Typical onsetany age

Detectableyes

Walk awayno

Evidencedocumented

What happens

Symptom. Bubbling at the rear arch lip, scaling on subframe mounting points and rear suspension components.

Cause. Age plus road salt. This generation isn't a notorious rotter, but nothing from 2005–2013 is immune in a salted market.

How to check it

Static checks

Put it on a lift and look at the rear subframe mounting points and the arch lips from behind. Largely a non-issue on cars from southern Europe, a real one on northern and Baltic cars.

Engine off, ideally on a lift.

Body & corrosionoccasionalDetectable at viewingevidence: documented

Every variant that carries this

Variant	Chassis	Body	Years	Risk	Good buy	Cost as % of good buy
318i N46	E90	sedan	2005–2011	R3	€3,100	37%
318i N46	E91	wagon	2005–2011	R3	€3,300	35%
320i N46	E90	sedan	2005–2007	R3	€3,400	34%
320i N46	E91	wagon	2005–2007	R3	€3,600	32%
320i N43	E90	sedan	2007–2011	R4	€3,950	29%
320i N43	E91	wagon	2007–2011	R4	€4,200	27%
320i N43	E92	coupe	2007–2011	R4	€4,550	25%
320i N43	E93	convertible	2007–2011	R4	€4,450	26%
323i N52	E90	sedan	2005–2007	R2	€4,050	28%
323i N52	E91	wagon	2005–2007	R2	€4,300	27%
323i N52	E92	coupe	2006–2007	R2	€4,650	25%
325i N52	E90	sedan	2005–2007	R2	€4,750	24%
325i N52	E91	wagon	2005–2007	R2	€5,050	23%
325i N52	E92	coupe	2006–2007	R2	€5,450	21%
325i N52	E93	convertible	2007	R2	€5,350	21%
325i N53	E90	sedan	2007–2011	R4	€5,250	22%
325i N53	E91	wagon	2007–2012	R4	€5,550	21%
325i N53	E92	coupe	2007–2013	R4	€6,050	19%
325i N53	E93	convertible	2007–2013	R4	€5,900	19%
328i N52	E90	sedan	2006–2011	R2	€5,150	22%
328i N52	E91	wagon	2006–2012	R2	€5,450	21%
328i N52	E92	coupe	2006–2013	R2	€5,950	19%
328i N52	E93	convertible	2007–2013	R2	€5,750	20%
330i N52	E90	sedan	2005–2007	R2	€5,600	21%
330i N52	E91	wagon	2005–2007	R2	€5,950	19%
330i N52	E92	coupe	2006–2007	R2	€6,450	18%
330i N53	E90	sedan	2007–2011	R4	€6,000	19%
330i N53	E91	wagon	2007–2011	R4	€6,350	18%
330i N53	E92	coupe	2007–2011	R4	€6,900	17%
330i N53	E93	convertible	2007–2011	R4	€6,750	17%
335i N54	E90	sedan	2006–2010	R4	€7,350	16%
335i N54	E92	coupe	2006–2010	R4	€8,450	14%
335i N54	E93	convertible	2007–2010	R4	€8,250	14%
335i N55	E90	sedan	2010–2011	R3	€11,700	10%
335i N55	E92	coupe	2010–2013	R3	€13,450	9%
335i N55	E93	convertible	2010–2013	R3	€13,100	9%
316d N47	E90	sedan	2009–2011	R5	€4,200	27%
316d N47	E91	wagon	2009–2011	R5	€4,450	26%
318d N47	E90	sedan	2007–2011	R5	€4,100	28%
318d N47	E91	wagon	2007–2011	R5	€4,350	26%
320d M47	E90	sedan	2005–2007	R3	€3,800	30%
320d M47	E91	wagon	2005–2007	R3	€4,050	28%
320d N47	E90	sedan	2007–2011	R5	€4,400	26%
320d N47	E91	wagon	2007–2012	R5	€4,650	25%
320d N47	E92	coupe	2007–2013	R5	€5,050	23%
320d N47	E93	convertible	2007–2013	R5	€4,950	23%
325d M57	E90	sedan	2006–2010	R2	€5,200	22%
325d M57	E91	wagon	2006–2010	R2	€5,500	21%
325d M57	E92	coupe	2006–2010	R2	€6,000	19%
325d N57	E90	sedan	2010–2011	R3	€7,200	16%
325d N57	E91	wagon	2010–2012	R3	€7,650	15%
325d N57	E92	coupe	2010–2013	R3	€8,300	14%
330d M57	E90	sedan	2005–2008	R2	€5,950	19%
330d M57	E91	wagon	2005–2008	R2	€6,300	18%
330d M57	E92	coupe	2006–2008	R2	€6,850	17%
330d M57	E93	convertible	2007–2008	R2	€6,700	17%
330d N57	E90	sedan	2008–2011	R3	€8,500	14%
330d N57	E91	wagon	2008–2012	R3	€9,050	13%
330d N57	E92	coupe	2008–2013	R3	€9,000	13%
330d N57	E93	convertible	2008–2013	R3	€8,750	13%
335d M57	E90	sedan	2006–2010	R3	€6,900	17%
335d M57	E92	coupe	2006–2010	R3	€7,950	14%
M3 S65	E90	sedan	2007–2011	R4	€35,700	3%
M3 S65	E92	coupe	2007–2013	R4	€35,000	3%
M3 S65	E93	convertible	2007–2013	R4	€30,800	4%

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.