What Do These Acronyms Mean?
When browsing used car listings, you'll frequently encounter these abbreviations. Understanding them is crucial because they significantly impact both the car's value and your peace of mind as a buyer.
FSH, FDSH, FMSH, PSH Explained: Understanding Types of Service History
Decoding the acronyms you'll see in car listings and what they actually mean for value.
6 min read•Updated January 2025
Quick glossary: FSH means Full Service History. FDSH means Full Dealer Service History. FMSH means Full Manufacturer Service History (sometimes called Full Franchise Service History). PSH means Part Service History.
Quick Reference
FDSH
Full Dealer Service History
Premium value
FSH
Full Service History
Good value
PSH
Part Service History
Reduced value
FDSH - Full Dealer Service History
Also called: Main Dealer Service History (MDSH), Full Manufacturer Service History (FMSH), Full Franchise Service History
Definition: The vehicle has been serviced exclusively at franchise dealerships (official brand dealers) for its entire life, with no gaps in the service schedule.
What this means:
- ✓ Every service performed by manufacturer-trained technicians
- ✓ Genuine OEM parts used throughout
- ✓ Records stored in manufacturer's central database
- ✓ Warranty terms always maintained
- ✓ Typically highest resale value
Value Impact:+10-15% premium over FSH
Best for: Premium brands (BMW, Mercedes, Audi, Porsche), newer vehicles, warranty-sensitive buyers, enthusiast cars.
FSH - Full Service History
The most common type you'll see
Definition: The vehicle has a complete service record with no missed services, but may include work done at independent garages as well as (or instead of) main dealers.
What this means:
- ✓ No gaps in servicing schedule
- ✓ May include independent specialist garages
- ✓ Parts may be OEM-equivalent rather than genuine
- ✓ Good proof of regular maintenance
- ✓ Strong resale value
Value Impact:Standard market value
Best for: Most buyers, mainstream brands, vehicles out of warranty, cost-conscious owners who maintained their cars well.
PSH - Part Service History
Incomplete records - proceed with caution
Definition: The vehicle has some service records but not a complete history. There are gaps where services may have been missed or records lost.
What this means:
- ⚠️ Gaps in maintenance timeline
- ⚠️ Unknown what was done during missing periods
- ⚠️ Could indicate skipped services or lost records
- ⚠️ Higher risk of hidden problems
- ⚠️ Reduced resale value
Value Impact:-10-20% below FSH value
Considerations: Check what periods are covered. PSH with only recent history missing might just mean lost paperwork. PSH with no recent records is more concerning.
NSH / No Service History
Highest risk category
Definition: No service records available whatsoever. The car's maintenance history is completely unknown.
Red flags:
- ❌ No proof the car was ever serviced
- ❌ Mileage impossible to verify
- ❌ Hidden mechanical issues likely
- ❌ 50% of buyers won't consider these cars
- ❌ Significant price reduction required
Value Impact:-15-25% below FSH value
Important: Before assuming NSH, check if digital records exist. Many 2012+ cars have manufacturer database records even when paper books are lost.
Which Type Should You Look For?
Premium/Performance Cars (BMW, Mercedes, Audi, Porsche, etc.)
Aim for: FDSH - These cars hold value best with main dealer stamps. Independent servicing can void warranties and reduce resale significantly. FDSH is expected by buyers in this segment.
Mainstream Cars (Ford, Vauxhall, VW, etc.)
Aim for: FSH minimum - Full history is important, but independent garage stamps are perfectly acceptable. Quality independent specialists often provide better value without impacting resale.
Older/Budget Cars (10+ years, under £5,000)
FSH ideal, PSH acceptable - At this price point, any documented history is valuable. Focus on recent records showing current condition rather than complete history from new.
Common Misconceptions
"FSH means main dealer only"
False. FSH means complete history - it can include independent garages. Only FDSH/MDSH specifically means main dealer throughout.
"Independent servicing voids warranty"
Not necessarily. EU Block Exemption rules mean manufacturers can't void warranties just because you used an independent garage, as long as the work was done to manufacturer standards with appropriate parts.
"Paper stamps are more valuable than digital records"
The opposite is true. Digital manufacturer records are actually more valuable because they can't be forged and are verified directly from the brand's database.
How to Verify Service History Type
Don't just take the seller's word for it. Here's how to verify:
- Check the service book: Look for stamps with dates, mileages, and garage details
- Cross-reference with MOT history: Free at gov.uk - mileages should align
- Contact listed garages: Call to verify they actually performed the work
- Check digital records: Many manufacturers have online service history portals
- Use a service history check: Services like ServiceStamp pull verified manufacturer records
Summary: Service History Types at a Glance
| Type | Meaning | Value Impact | Risk Level |
|---|---|---|---|
| FDSH | All services at main dealers | Premium (+10-15%) | Lowest |
| FSH | Complete history, any garage | Standard | Low |
| PSH | Some records, gaps exist | Reduced (-10-20%) | Medium |
| NSH | No records available | Significant (-15-25%) | High |