AI Damage2007 Mercedes-Benz ML320: common problems
Owners of the 2007 Mercedes-Benz ML320 filed 16 complaints with NHTSA, most often about engine and cooling and seats. Details by component below, with sources.
Key figures
- Owner complaints
- 16
What fails most often
- 1 Engine and cooling 31% of all complaints
- 2 Seats 19% of all complaints
- 3 Service brakes 19% of all complaints
- 4 Electrical system 13% of all complaints
- 5 Powertrain 13% of all complaints
- 6 Air bags 6% of all complaints
- 7 Fuel/propulsion system 6% of all complaints
- 8 Fuel system 6% of all complaints
- Engine and cooling: 5 complaints (31% of all).
- Seats: 3 complaints (19% of all).
- Service brakes: 3 complaints (19% of all).
- Electrical system: 2 complaints (13% of all).
- Powertrain: 2 complaints (13% of all).
Symptoms owners describe
How many of the 16 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 5 | 0 | 0 |
| Seats | 3 | 0 | 0 |
| Service brakes | 3 | 0 | 0 |
| Electrical system | 2 | 0 | 0 |
| Powertrain | 2 | 0 | 0 |
| Air bags | 1 | 0 | 0 |
| Fuel/propulsion system | 1 | 0 | 0 |
| Fuel system | 1 | 0 | 0 |
| Steering | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
My 2007 MB ML320 CDI has problem with water entering where spare tire located,after rain or when i use car wash.It builds inside so much water that module for for fuel pump stopped working,all wires were corroded,I paid for repairs from my pocket because MB dealership refused to fix my vehicle even they new MB ML/GL…
The vehicle would suddenly stop shifting or shift into neutral. This could happen at freeway speeds, where it would suddenly not have any power and just coast or it could be stuck in 4th at a stoplight and not be able to move.
Premature line corrosion on all of the steel hard lines. The brake lines are corroded and blistered and one of the lines are leaking fluid.
STS light on with message saying Right curtain airbag malfunction visit workshop
The contact received notification of NHTSA Campaign Number: 22V315000 (Service Brakes, Hydraulics) however, the part to do the recall repair was not yet available. The dealer was made aware of the issue. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
The contact was made aware of NHTSA Campaign Number: 22V315000 (Service Brake, Hydraulic) however, the part to do the recall repair was not yet available. The local dealers [dealer] (2025 Airport Way S, Seattle, [ZIP]:[phone]) and [dealer] (17800 Hwy 99, Lynnwood, [ZIP]:[phone]) were contacted.
Prior to the failure, the vehicle hesitated while driving. The contact pointed out that the vehicle was equipped with a diesel engine. The vehicle was towed to the dealer (mercedes-benz of annapolis, 324 6th st. Annapolis, [ZIP], [phone]) where it was diagnosed with catastrophic engine failure.
Seat back warmer overheats/burns small burn - the drivers side seat seat warmer burned a whole through the material and through my wife jacket causing a small burn above her left leg. Basically a thermal incident in which the seat has a hole the size of a quarter burned through the seat cover.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 9,040 of 36,656 model years in the NHTSA data (top 25% most complained about).
On average one model year of the ML320 has 57 complaints (13 years in the data). This year has 16, below average.
What to check before buying
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Seats. Occupant sensor, power adjustment, seat mounts.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Other years of this model
Questions and answers
What are the most common problems with the 2007 Mercedes-Benz ML320?
Owner complaints to NHTSA most often mention: engine and cooling, seats, service brakes. Total complaints: 16. The most frequent symptoms in complaint texts: rust, corrosion (13%), warning lights, check engine (13%), engine failure or replacement (6%).
How many service bulletins (TSB) were issued for the 2007 Mercedes-Benz ML320?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2007 Mercedes-Benz ML320 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2007 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.