Common Mercedes GLS 400 AMG LN Prem+exe D 4M A Problems, Faults, and Repair Costs
Typical MOT issues to check on the Mercedes GLS 400 AMG LN Prem+exe D 4M A, with rough repair costs, and its MOT pass rate for each model year. Based on 572 MOT tests across 2 model years (DVSA data for tests carried out in 2024, retests included).
Segment: premium performance | Fuel: Diesel
90%
Mercedes GLS 400 AMG LN Prem+exe D 4M A pass rate
87%
Mercedes average
82%
All-model average
The Mercedes GLS 400 AMG LN Prem+exe D 4M A has an average MOT pass rate of 90%, which is 3 points above the Mercedes average and 8 points above the average across all models in our data.
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Common MOT Issues to Check on the Mercedes GLS 400 AMG LN Prem+exe D 4M A
Typical issues for a car of this age and type, estimated from its age, fuel type and engine size (not counted from its MOT records), with rough repair costs
Suspension
High likelihood£150 - £600
Typical repair cost
Common advisories:
Suspension arm bush worn, shock absorber misting, spring corroded
Failure points:
Coil spring broken, ball joint excessive play, shock absorber leaking
Tyres
High likelihood£50 - £300
Typical repair cost
Common advisories:
Tyre approaching legal limit, slight damage to sidewall
Failure points:
Tyre below minimum tread depth, tyre has a cut exposing ply
Brakes
Moderate likelihood£80 - £450
Typical repair cost
Common advisories:
Brake discs worn, brake pads thin, handbrake adjustment needed
Failure points:
Brake disc excessively worn, brake pipe corroded, brake efficiency below minimum
Lights
Moderate likelihood£15 - £200
Typical repair cost
Common advisories:
Headlamp aim slightly out, lens deteriorated
Failure points:
Headlamp not working, brake light not functioning, indicator failure
Exhaust & Emissions
Moderate likelihood£80 - £800
Typical repair cost
Common advisories:
Exhaust mounting corroded, slight exhaust leak
Failure points:
Exhaust emissions exceed limits, catalytic converter efficiency low, DPF warning
Steering
Lower likelihood£100 - £500
Typical repair cost
Common advisories:
Track rod end has slight play, steering rack boot deteriorated
Failure points:
Steering rack leaking, track rod ball joint worn beyond limits
Body & Structure
Lower likelihood£200 - £1200
Typical repair cost
Common advisories:
Surface corrosion on subframe, slight body panel damage
Failure points:
Structural corrosion, body mounting corroded through, chassis weakness
Windscreen & Wipers
Lower likelihood£10 - £350
Typical repair cost
Common advisories:
Minor windscreen chip, wiper blade deteriorated
Failure points:
Windscreen crack in swept area, wiper does not clear windscreen
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Mercedes GLS 400 AMG LN Prem+exe D 4M A Reliability by Year
MOT pass rate for each model year, from DVSA data for tests carried out in 2024 (retests included). Newer cars usually pass more often simply because they are younger. Highest and lowest are marked among years with 100+ tests that were at least three years old when tested. Fuel and engine size are a guide only.
Highest Pass Rate
2021
91% pass rate from 326 tests
View 2021 Mercedes GLS 400 AMG LN Prem+exe D 4M A detailsLowest Pass Rate
2020
89% pass rate from 246 tests
View 2020 Mercedes GLS 400 AMG LN Prem+exe D 4M A detailsMercedes GLS 400 AMG LN Prem+exe D 4M A Running Costs
Want to know the full annual running costs for the Mercedes GLS 400 AMG LN Prem+exe D 4M A? Including fuel, road tax, the MOT and predicted repairs based on MOT pass rates, plus an estimated insurance group.
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Find garages →Mercedes GLS 400 AMG LN Prem+exe D 4M A FAQ
What are the most common Mercedes GLS 400 AMG LN Prem+exe D 4M A problems?
Typical issues to check on a Mercedes GLS 400 AMG LN Prem+exe D 4M A of this age and type are suspension and tyres. These are estimated from its age, fuel type and engine size, not counted from its MOT records. Across 572 MOT tests (DVSA MOT data for tests in 2024, retests included), 90% ended in a pass.
Is the Mercedes GLS 400 AMG LN Prem+exe D 4M A reliable?
The Mercedes GLS 400 AMG LN Prem+exe D 4M A has an average MOT pass rate of 90%, from 572 MOT tests. That is 8 points above the average across all models in our data (82%), a better than average result. Pass rates fall as cars age, so compare it with cars of a similar age.
Which year Mercedes GLS 400 AMG LN Prem+exe D 4M A is the most reliable?
Of the years with at least 100 tests that were old enough for a routine MOT, the 2021 Mercedes GLS 400 AMG LN Prem+exe D 4M A has the highest MOT pass rate: 91% of its 326 tests ended in a pass. The 2020 has the lowest at 89%. Newer cars usually pass more often simply because they are younger, so the pass rate is only part of the picture.
How much does it cost to fix common Mercedes GLS 400 AMG LN Prem+exe D 4M A faults?
As a rough guide, brake work on a Mercedes GLS 400 AMG LN Prem+exe D 4M A typically costs £80-£450 and suspension repairs £150-£600, while exhaust and emissions fixes can cost £80-£800. Lighting and wiper fixes are usually under £200.
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Other Mercedes Models
Common problems pages for other Mercedes models