Rear air spring leak
Attaches to F31 at chassis level · Suspension · carried by 5 variants across 1 chassis
Overview
Rear air spring leak is a common fault recorded against F31 at chassis level, typically from 90–180k km. It shows up as the rear of the car sitting low after standing, a suspension warning, or a compressor that runs for longer than it should. Where it's documented, the repair runs €300–€1,200 (a pair of air springs at the cheap end, springs and compressor at the dear end, costs dated 2026-09), and it can be checked before you buy. 5 variants across 1 chassis in this database inherit it.
What happens
Symptom. The rear of the car sitting low after standing, a suspension warning, or a compressor that runs for longer than it should.
Cause. The Touring's self-levelling rear suspension uses air springs, and their rubber bags perish and crack with age. A leaking spring then makes the compressor work harder until it fails as well.
How to check it
Static checks
Look at the car cold and before it's been started, and check that it sits level. Then load the boot and watch it lift back to height, listening for the compressor running on.
Engine off, ideally on a lift.
Every variant that carries this
| Variant | Chassis | Body | Years | Risk | Good buy | Cost as % of good buy |
|---|---|---|---|---|---|---|
| 320d N47 | F31 | wagon | 2012–2015 | R4 | €9,800 | 8% |
| 320d B47 | F31 | wagon | 2015–2019 | R2 | €17,600 | 4% |
| 330d N57 | F31 | wagon | 2012–2018 | R3 | €15,350 | 5% |
| 328i N20 | F31 | wagon | 2012–2015 | R4 | €11,700 | 6% |
| 335i N55 | F31 | wagon | 2012–2015 | R3 | €14,050 | 5% |
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.