Pass rate
97.1%
Above average — 9.2 pts ahead of the 87.9% that cars this age and mileage manage.
Across 171 recorded tests.
Typical repair bill £10–£31
2018 Dethleffs motorhome MOT pass rate
- 2018
- Motorhome
- 8 trims combined
- typical 21,148 mi
Check your postcode
Most common fault
Lamps & electrics
35.7% of faults · 12.2% nationally
Part only £6–£18 for Registration plate lamp inoperative (multiple lamps). What fitting it takes →
Which year to buy
- Best 2018 97.1% pass · this year
- Avoid 2021 90.0% pass
Across the 8 years on record, a spread of 7.1 points. See every year →
- First-attempt pass
- 97.0%
- Typical mileage
- 21k mi
The 2018 Dethleffs motorhome MOT pass rate is 97.1% of its MOT tests — 9.2 points ahead of what its age and mileage predict. Lamps & electrics is the biggest single reason it fails, at 35.7% of what testers record.
Expert verdict
Lamps & electrics: 2.9× the national share
Lamps & electrics make up 35.7% of everything recorded on the 2018 Dethleffs Motorhome, against 12.2% nationally — 23.5 points above. Walk round the car with the lights on before the test: bulbs, indicators and number-plate lamps are the cheapest failures to prevent and among the most common.
- Beats its own age and mileage. Once you allow for how old and how far these motorhomes have been driven, the expected pass rate is 87.9% and this one manages 97.1% — 9.2 points ahead of what its age and mileage predict.
- Failures here tend to be cheap ones. 82% of the repairs this model fails on cost under £30 in parts. The pass rate matters less than what a bad afternoon at the test centre actually costs you.
Written from this page's own figures: fault shares against the national composition, the like-for-like pass rate, and the priced repair list. How these are worked out
Watching a Dethleffs Motorhome? Get an email when these numbers change .
Every Dethleffs motorhome first registered in 2018 is combined here — 8 trim and body variants in total — so the sample is as large as the DVSA data allows.
How does the 2018 Dethleffs motorhome compare?
Cars of this age and mileage average 87.9%, so this figure is 9.2 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 97.0%. The median 2018 Dethleffs motorhome in this dataset had covered 21,148 mi.
Pass rates also shift with the test month: tests recorded October–March passed 96.7% of the time, April–September 97.5%.
The single most recorded failure item is "Registration plate lamp(s) inoperative in the case of multiple lamps or light sources", noted on 4.09% of tests.
- 171 recorded tests behind this page.
- 97.1% overall pass rate, 97.0% on a first attempt.
- Across every year of the Dethleffs motorhome, the average is 92.6% — best year 2018 (97.1%), worst 2021 (90.0%).
Figures count every completed test on this vehicle-year in the dataset, including retests. See methodology for the exact definition.
This page's data
- Tests analysed
- 171
- Typical mileage (median)
- 21,148 mi
- Make and model
- Dethleffs Motorhome
- Updated
- 2026-11-07
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Number Plate Lamp
Usually a DIY or independent-garage job.
Does mileage affect the Motorhome MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 42% so small gaps stay visible.
Regional pass rates for the Motorhome
| Region | Tests | Pass rate |
|---|---|---|
| East of England | 61 | 98.4% |
| South East | 32 | 96.9% |
Regions come from the postcode area recorded at the test station. Areas on region borders are assigned to the region with the majority of their population.
What fails a 2018 Motorhome
Everything a tester recorded on this vehicle, grouped into the inspection sections that produced it. The notch on each bar is the national share, so you can see at a glance whether this car is unusual or just ordinary.
A test can record several items, so these percentages do not add up to 100%. The exact strings, with prices, are in the full DVSA record at the bottom of this page.
Before your test
Three checks worth doing on a 2018 Motorhome
These are not generic tips — they are the faults recorded most often on this exact model, rewritten as things you can check yourself. All three take about ten minutes and cost nothing.
-
Check the lights 4.1% of tests
“registration plate lamp(s) inoperative in the case of multiple lamps or light sources”
Switch everything on and walk round the car: both headlamps on dip and main, every indicator, both brake lights, reverse, fog and the two number-plate lamps. A bulb is a few pounds and a five-minute job.
-
Check the wipers and washers 1.8% of tests
“wipers blade defective”
Run the wipers with the screen wet: they should clear it in one sweep without smearing or juddering. Top the washer bottle up and check both jets hit the screen.
Shares are the proportion of tests on this vehicle that recorded the item, so they overlap: one test can record several.
What it costs to get a 2018 Motorhome through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £10–£31 — and 82% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £10–£31
- Cheapest common item: malfunction indicator lamp inoperative or…
- £3–£12
- Dearest common item: not functioning as intended
- £40–£120
- Common items a careful owner can do at home
- 60%
- Repairs that still cost under £30
- 82%
Estimates from typical UK parts prices, weighted by how often each item appears in 171 MOT tests on this vehicle. They exclude diagnostics, retest fees and garage labour where the part is a DIY fit, and they are not figures from the DVSA dataset. Older and higher-mileage examples cost more than the average. How these estimates are built → · All MOT repair costs → · Cheapest cars to put through a test →
Every year of the Motorhome, side by side
8 model years on record, from 2015 to 2022. Across them the pass rate runs from 90.0% to 97.1% — a spread of 7.1 points. The bar under each year is the item that failed it most often.
- 2015 90.3% registration plate lamp(s)…
- 2016 90.3% registration plate lamp(s)…
- 2017 91.9% registration plate lamp(s)…
- 2018 97.1%registration plate lamp(s)…
- 2019 94.0% registration plate lamp(s)…
- 2020 93.0% wipers blade defective
- 2021 90.0% windscreen damaged but not…
- 2022 92.5% windscreen damaged but not…
Colour is the pass rate on a fixed scale, so a block means the same thing on any model. Each year links to its own page with the full fault breakdown.
Compare the 2018 Dethleffs Motorhome with another year
The raw pass rate mostly measures age. The year comparison adds the like-for-like figure, the mileage bands and the repair bill.
Other 2018 motorhomes with a similar record
- Rapido Motorhome 95.1%
- Peugeot Motorhome 94.5%
- Fiat Motorhome 94.2%
- Mobilvetta Motorhome 94.1%
- Ford Motorhome 93.7%
- Mercedes-Benz Motorhome 92.8%
Closest pass rates among 2018 motorhomes with at least 150 tests, so a small sample cannot flatter itself into the list. Full rankings: best motorhomes and worst motorhomes for MOT pass rates.
The full DVSA record for the 2018 Dethleffs Motorhome 10 failure items · 6 advisories · 7 inspection categories · mileage brackets · all of it in the page, none of it above the fold
Every inspection category
Shares of the 56 individual items recorded on this vehicle, and the same share across all cars nationally. A single test can record several items, so a row is not a percentage of tests.
| Category | Items | This car | Nationally | Difference |
|---|---|---|---|---|
| Lamps, reflectors and electrical equipment | 20 | 35.70% | 12.21% | +23.49 |
| Tyres | 13 | 23.20% | 19.76% | +3.44 |
| Brakes | 9 | 16.10% | 20.89% | −4.79 |
| Noise, emissions and leaks | 5 | 8.90% | 5.52% | +3.38 |
| Visibility | 4 | 7.10% | 4.97% | +2.13 |
| Seat belts and supplementary restraint systems | 3 | 5.40% | 0.82% | +4.58 |
| Non-component advisories | 2 | 3.60% | 4.18% | −0.58 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Registration plate lamp(s) inoperative in the case of multiple lamps or light sources Lamps, reflectors and electrical equipment | Minor | 4.1% | £5–20 |
| Wipers blade defective Visibility | Minor | 1.8% | £8–22 |
| Malfunction indicator lamp inoperative or indicates a malfunction Noise, emissions and leaks | Rectified | 1.2% | £3–12 |
| Outline marker lamp with a multiple light source up to 1/2 not functioning Lamps, reflectors and electrical equipment | Minor | 1.2% | £3–15 |
| Rear fog lamp not working Lamps, reflectors and electrical equipment | Major | 1.2% | £3–15 |
| Stop lamp not working Lamps, reflectors and electrical equipment | Rectified | 1.2% | £3–12 |
| Headlamp aim projected beam image is obviously incorrect Lamps, reflectors and electrical equipment | Major | 0.58% | £30–80 |
| Headlamp aim too far to the right Lamps, reflectors and electrical equipment | Rectified | 0.58% | £30–80 |
| Headlamp aim too high Lamps, reflectors and electrical equipment | Rectified | 0.58% | £30–80 |
| Not functioning as intended Seat belts and supplementary restraint systems | Major | 0.58% | £40–120 |
Severity is as recorded: Major and Dangerous fail the test outright; Minor and Advisory do not. Costs are estimates from typical UK parts prices — see how they are built.
What testers noted without failing the car
Advisories are the early warnings — the same parts a year or two before they fail. Reading them is how you tell a car that has been maintained from one that has been patched.
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 5.8% | £45–95 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 1.8% | £45–110 |
| Engine oil leaks leaking excessively from engine Noise, emissions and leaks | Advisory | 1.8% | £200–700 |
| Non-component advisories Vehicles internal headlight adjuster altered to recheck lights Non-component advisories | Advisory | 1.2% | £3–15 |
| Brake discs significantly and obviously worn Brakes | Advisory | 0.58% | £45–110 |
| Brake pads less than 1.5 mm thick Brakes | Advisory | 0.58% | £18–45 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 138 | 97.8% | 18,120 mi |
| 30-60k | 31 | 96.8% | 39,082 mi |
| 60-90k | 2 | 50.0% | 72,366 mi |
Source: 171 recorded tests on this vehicle-year. Every row above is recomputed from the same DVSA extract as the rest of the page — see the methodology.
2018 Motorhome MOT questions
What is the MOT pass rate for a 2018 Dethleffs motorhome?
97.1% of the 171 2018 Dethleffs motorhome tests in this dataset passed, against a national average of 87.9% for cars first used in 2018. First-attempt pass rate: 97.0%.
What are the most common MOT failures on a 2018 Dethleffs motorhome?
The three most recorded items are registration plate lamp(s) inoperative in the case of multiple lamps or light sources (4.09%), wipers blade defective (1.75%), malfunction indicator lamp inoperative or indicates a malfunction (1.17%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2018 Dethleffs motorhome MOT pass rate?
Yes. Cars under 30,000 miles passed 97.8% of the time, falling to 50.0% for those over 120,000 miles. The median 2018 Dethleffs motorhome in this dataset had covered 21,148 mi.
Does the season affect the 2018 Dethleffs motorhome MOT pass rate?
Tests recorded in the winter months (October–March) passed 96.7% of the time; summer months (April–September) passed 97.5%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.