Module, sensor and infotainment faults
Attaches to 940 at chassis level · Electrical · carried by 2 variants across 1 chassis
Overview
Module, sensor and infotainment faults is a common fault recorded against 940 at chassis level, typically from 90–180k km. It shows up as warning lights that appear and clear, an infotainment screen that reboots, and switches or window motors that stop working. Where it's documented, the repair runs €120–€800 (battery at the cheap end, module replacement and coding at the dear end, costs dated 2026-07), and it can be checked before you buy. 2 variants across 1 chassis in this database inherit it.
What happens
Symptom. Warning lights that appear and clear, an infotainment screen that reboots, and switches or window motors that stop working.
Cause. The car carries a lot of small modules and their connectors age, particularly where damp reaches them. A tired battery makes several unrelated-looking faults appear at once, which is what confuses most diagnoses.
How to check it
OBD scan
Work every switch, window, mirror and screen function during the viewing, then scan every module rather than just the engine. Check the battery's age while you're there.
Mandatory. A seller who refuses a scan has answered the question.
Every variant that carries this
| Variant | Chassis | Body | Years | Risk | Good buy | Cost as % of good buy |
|---|---|---|---|---|---|---|
| 1.4 MultiAir 940A2 | 940 | hatchback | 2010–2020 | R3 | €5,500 | 8% |
| 1.6 JTDm 940A3 | 940 | hatchback | 2010–2020 | R2 | €5,200 | 9% |
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.