Throttle actuator failure
Attaches to S65 at engine level · Engine · carried by 3 variants across 3 chassis
Overview
Throttle actuator failure is a common fault recorded against S65 at engine level, typically from 80–180k km. It shows up as engine warning light, limp mode, reduced power, actuator fault codes. Where it's documented, the repair runs €800–€1,600 (pair replaced or rebuilt, costs dated 2026-07), and it can be checked before you buy. 3 variants across 3 chassis in this database inherit it.
What happens
Symptom. Engine warning light, limp mode, reduced power, actuator fault codes.
Cause. The individual throttle body actuators wear internally. The V8 has two.
Sources. Extended coverage programme in several markets
How to check it
OBD scan
Scan for actuator codes including stored history. Ask whether they've been replaced. Most cars have had at least one.
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 |
|---|---|---|---|---|---|---|
| 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.