Mercedes-Benz GLS X167 (2020-present) reliability
Mercedes-Benz GLS X167 built around 2020: not enough MOT data yet
We've only seen a handful of Mercedes-Benz GLS X167 models built around 2020 so far. Too few to spot a pattern yet.
Looking at a Mercedes-Benz GLS X167?
Enter its number plate to see its full MOT history, risk rating and running costs.
Key figure
Check a car’s number plate to see its own MOT record, or come back when there’s more MOT history.
Based on 1,052 tests of GLS models registered 2020+.
About 1 in 6 diesel GLS cars registered in 2022 (16.2%) failed their first MOT.
Based on 328 first MOTs (DVSA MOT results, 2025).
X167 fail rate by age
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Build years are worked out from age, so they are approximate. Tests counted are 2025 MOTs. Highest fail rate at 3 years old.
How the GLS X167 compares
At each age below, see how the GLS X167 holds up against other cars the same age. The averages combine all fuel types.
Based on 124,145 tests across 22 Mercedes-Benz models, built around 2020 (5 years old).
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Build years are worked out from age, so they are approximate. Tests counted are 2025 MOTs.
What to check before viewing
The model's most common MOT issues, turned into things you can ask about or look for.
Brake pads
High priorityAsk when the pads were last replaced and check the warning-light history.
Brake discs
High priorityAsk for the date and mileage of the last disc replacement; visually check for a deep wear lip and rust pitting on each disc.
Tyres
Worth checkingCheck tread depth across the full width on all four; uneven wear suggests alignment or suspension issues.
Suspension bushes and joints
Worth checkingListen for knocks over speed bumps and ask about recent control-arm or anti-roll-bar work.
Vehicle-specific check
Worth checkingCheck the car’s number plate on MOT Wise to see its own MOT history and any recalls for its build years.
Other SUVs to compare
Other SUVs, with each one's figures taken at the same age as the GLS X167.
- 1
Lexus RX
Same body type, tested at the same age
- Fail rate
- 4.9%
- Fail, no pass in 3 days
- 0.8%
- Dangerous
- 1.5%
- Still registered at 10 years
- 90.4%
Lower fail rate: 4.9%, against 13.4% for the Mercedes-Benz GLS X167, both built around 2020.
1,790 MOT tests on cars built around 2020
- 2
Lexus UX
Same body type, tested at the same age
- Fail rate
- 7.1%
- Fail, no pass in 3 days
- 0.6%
- Dangerous
- 2.3%
Lower fail rate: 7.1%, against 13.4% for the Mercedes-Benz GLS X167, both built around 2020.
4,133 MOT tests on cars built around 2020
- 3
Porsche Macan
Same body type, tested at the same age
- Fail rate
- 6.5%
- Fail, no pass in 3 days
- 1.3%
- Dangerous
- 2.1%
- Still registered at 10 years
- 91.6%
Lower fail rate: 6.5%, against 13.4% for the Mercedes-Benz GLS X167, both built around 2020.
2 critical recall campaigns matching this model/build period.
4,146 MOT tests on cars built around 2020
- 4
Honda HR-V
Same body type, tested at the same age
- Fail rate
- 8%
- Fail, no pass in 3 days
- 0.6%
- Dangerous
- 2.8%
- Still registered at 10 years
- 97%
Lower fail rate: 8.0%, against 13.4% for the Mercedes-Benz GLS X167, both built around 2020.
4,166 MOT tests on cars built around 2020
- Fail rate
- = the share of MOT tests that ended in a fail. Retests count as tests.
- Fail, no pass in 3 days
- = the share of MOT tests that failed and still hadn't passed 3 days later. A fail that passed a retest within 3 days, even the same day, isn't counted.
- Dangerous
- = the share of MOT tests where the tester marked a fault as dangerous. It is against the law to drive the car until it is fixed.
- Still registered at 10 years
- = the share of cars still registered (taxed or declared off the road) 10 years after they were first registered.
Recall context
46 recalls in all18 of the 46 GLS X167 recalls cover cars built in these years.
- 18 recalls
Top concerns
- On affected vehicles the fuel pump impeller might not meet specifications and may deform.
- Installation of A/C drain hoses
- Mercedes-Benz AG has determined that on certain GLE and GLS vehicles (167 platform) the air conditioning drain hoses mig
For the exact car, check GOV.UK's recall checker with the number plate.
How GLS X167 cars have aged
How GLS X167 cars have aged
How fail rates have changed as these cars got older. Each line follows cars first registered in about the same year across several years of MOT data. Not a prediction for any one car.
Some lines cover only a year or two, so read this as a rough guide.
Most common issues on Mercedes-Benz GLS models of this age
This list covers every Mercedes-Benz GLS built around 2020, whichever generation it is. We don't have a defect list for the X167 on its own.
Most common advisories and fails
In order of the share of MOT tests that recorded each one
- 117.1%Advisory
Tyre worn close to the legal limit or worn on the edge
- 27.4%Advisory
Brake pads wearing thin
- 36.5%Advisory
Tyre has a cut that does not reach the ply or cords
- 45.3%Advisory
Suspension arm pin or bush worn, but not moving too much
- 54.4%Advisory
Tyre slightly damaged, cracking or perishing
Based on 432 tests
Looking at a Mercedes-Benz GLS X167?
Enter its number plate to see its full MOT history, risk rating and running costs.
Frequently asked questions
Built around 2020 (5 years old), the Mercedes-Benz GLS X167 (2020-present) fails MOTs at about the rate typical for this age. This is based on 269 5-year-old MOT tests from DVSA data. Each retest counts as a test.