Renault Master 2021: reliability & common MOT faults

At a glance

How 504 first tests went in 2025.

Passed first time: 78 in every 100
Did not pass first time: 22 in every 100110 failed first-attempt tests
The typical car: 4 yearsabout 52,308 miles
First tests counted: 504

How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.

Note:

These are patterns across 2021 Renault Master vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Lamps and electrical

One wear pattern: headlight aim, 3.0 times as often as on similar cars.

Figures below are measured across the 110 failed first attempts in 2025 that had a mileage recorded, which allows a like-for-like comparison.

We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.

Headlight aim

Failed on 24 first tests3.0 times as often as similar carsWear pattern

What it means

Beam aim too high, too low or off to either side is Major. Where a driver's beam aim control is fitted, the aim is tested without altering the setting, and rechecked at the highest setting only if it would fail for being too low. Masks or converter kits on right hand dip headlamps are acceptable.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

MOT pass rates

How first tests ended, and how the pass rates are counted.

Passed first time: 78in every 100; Passed on the first test.
Fixed at the station: 6in every 100; Failed, then fixed at the test station the same day.
Failed: 16in every 100; Did not pass, and were not fixed at the test station.

First-attempt pass 78.2% of 504 first tests (2025): only cars that passed first time count. Official-style pass 84.1%: cars fixed at the test station also count as a pass. The 6 fixed and the 16 not fixed make the 22 in every 100 that did not pass first time.

Same model, other years

Passed first time in every 100, all tested in 2025.

Newer cars are younger, so look for a jump rather than the climb.

Year	Passed first time	First tests
2002	51 in every 100	323
2003	48 in every 100	355
2004	52 in every 100	468
2005	59 in every 100	643
2006	59 in every 100	1,077
2007	61 in every 100	1,252
2008	59 in every 100	1,009
2009	59 in every 100	667
2010	57 in every 100	657
2011	58 in every 100	633
2012	62 in every 100	673
2013	70 in every 100	608
2014	69 in every 100	596
2015	71 in every 100	753
2016	72 in every 100	692
2017	80 in every 100	579
2018	75 in every 100	677
2019	75 in every 100	658
2020	75 in every 100	485
2021 This car	78 in every 100	504
2022	78 in every 100	528

FAQs

Short answers about how to read this model-year guide.

Is the 2021 Renault Master reliable?

With 504 first tests, there are too few to say whether the 2021 Renault Master differs from the model years either side. Treat the faults below as a checklist. In 2025, 78.2% of 504 first MOTs on the 2021 Renault Master passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 84.1%. Among 110 failed first-attempt MOT tests (test year 2025), we highlight MOT failure patterns that show up more often than on cars of a similar age and mileage when the sample is large enough to trust. There is no single reliability score here; this is a pre-purchase checklist built from DVSA open data, not a guarantee for any individual car.

What does this Renault Master 2021 MOT report cover?

This page highlights MOT failure patterns for the 2021 Renault Master (registration year) using UK DVSA open data for the selected test year. Patterns are compared with cars of a similar age and mileage. It is a buyer checklist from MOT defect statistics, not a full service history or manufacturer service-bulletin list.

Does this include engine and gearbox problems?

No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.

About this data

How this page is built and what it can (and can't) say.

These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.

2024 2025

What we include

UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.

Same-day repairs

PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

How we compare

We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.

What this does not cover

MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
If the data for a car is too thin to say anything useful, we say so rather than guess.

Contains public sector information licensed under the Open Government Licence v3.0.