Pass rate
73.1%
Below average — 0.9 pts ahead of the 72.2% that cars this age and mileage manage.
Across 119 recorded tests.
Typical repair bill £42–£122
2004 Alfa Romeo 166 MOT pass rate
- 2004
- typical 105,416 mi
Most common fault
Brakes
28.2% of faults · 20.9% nationally
mostly worn pads and discs, corroded pipes and a handbrake that will not hold.
Which year to buy
- Best 2001 74.8% pass
- Avoid 2003 66.7% pass
Across the 6 years on record, a spread of 8.1 points. See every year →
- First-attempt pass
- 66.3%
- Typical mileage
- 105k mi
The 2004 Alfa Romeo 166 MOT pass rate is 73.1% of its MOT tests — about what its age and mileage predict. Brakes is the biggest single reason it fails, at 28.2% of what testers record.
Check your postcode
MOT pass rates are national — type your postcode to see how Alfa Romeo 166 does in your corner of the country.
Expert verdict
Brakes: 1.3× the national share
Brakes make up 28.2% of everything recorded on the 2004 Alfa Romeo 166, against 20.9% nationally — 7.3 points above. Have the discs and pads measured rather than glanced at, and ask whether the handbrake holds on a slope.
- When it fails, it costs. Only 28% of this model’s typical repairs come in under £30 in parts — the failures here tend to be the kind that need a garage rather than a bulb.
- Based on a small sample. 119 tests back this page. That is enough to publish and to index, not enough to treat the decimal places as precise — read the pattern, not the second digit.
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 Alfa Romeo 166? Get an email when these numbers change .
How does the 2004 Alfa Romeo 166 compare?
Cars of this age and mileage average 72.2%, so this figure is 0.9 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 66.3%. The median 2004 Alfa Romeo 166 in this dataset had covered 105,416 mi.
Pass rates also shift with the test month: tests recorded October–March passed 74.6% of the time, April–September 71.2%.
The single most recorded failure item is "Joints constant velocity boot severely deteriorated", noted on 9.24% of tests.
- 119 recorded tests behind this page.
- 73.1% overall pass rate, 66.3% on a first attempt.
- Across every year of the Alfa Romeo 166, the average is 71.2% — best year 2001 (74.8%), worst 2003 (66.7%).
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
- 119
- Typical mileage (median)
- 105,416 mi
- Make and model
- Alfa Romeo 166
- Updated
- 2026-11-05
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Body Panel Repair
Typically a garage job — get quotes before committing.
Does mileage affect the 166 MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 58% so small gaps stay visible.
Regional pass rates for the 166
| Region | Tests | Pass rate |
|---|---|---|
| South East | 38 | 68.4% |
| North West | 16 | 68.8% |
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 2004 166
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 2004 166
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 windscreen 5.9% of tests
“windscreen damaged”
Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.
-
Check the lights 5.0% of tests
“headlamp lens slightly defective”
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 suspension joints 4.2% of tests
“ball joint dust cover severely deteriorated”
With the car parked on level ground, rock the top of each front wheel in and out while someone watches the suspension arm. Clunks, or rubber boots split and greasy, are what testers record here.
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 2004 166 through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £42–£122 — and 28% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £42–£122
- Cheapest common item: malfunction indicator lamp inoperative or…
- £3–£12
- Dearest common item: joints constant velocity boot severely…
- £80–£250
- Common items a careful owner can do at home
- 70%
- Repairs that still cost under £30
- 28%
Estimates from typical UK parts prices, weighted by how often each item appears in 119 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 166, side by side
6 model years on record, from 2000 to 2005. Across them the pass rate runs from 66.7% to 74.8% — a spread of 8.1 points. The bar under each year is the item that failed it most often.
- 2000 66.9% rbt (sp) efficiency below…
- 2001 74.8% position lamp not working
- 2002 71.3% position lamp not working
- 2003 66.7% joints constant velocity boot…
- 2004 73.1%joints constant velocity boot…
- 2005 72.4% coil spring fractured or broken
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 2004 Alfa Romeo 166 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 2004 cars with a similar record
- Audi Tt 73.1%
- Mercedes-Benz A-Class 73.1%
- BMW 316 73.1%
- Suzuki Wagon-R+ 73.2%
- Mercedes-Benz Ml 72.9%
- SEAT Arosa 72.8%
Closest pass rates among 2004 cars with at least 2,000 tests, so a small sample cannot flatter itself into the list. See the full rankings: best and worst MOT pass rates.
The full DVSA record for the 2004 Alfa Romeo 166 10 failure items · 6 advisories · 10 inspection categories · mileage brackets · all of it in the page, none of it above the fold
Every inspection category
Shares of the 386 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 |
|---|---|---|---|---|
| Brakes | 111 | 28.20% | 20.89% | +7.31 |
| Suspension | 88 | 22.40% | 20.98% | +1.42 |
| Body, chassis, structure | 44 | 11.20% | 5.57% | +5.63 |
| Tyres | 40 | 10.20% | 19.76% | −9.56 |
| Noise, emissions and leaks | 34 | 8.70% | 5.52% | +3.18 |
| Lamps, reflectors and electrical equipment | 24 | 6.10% | 12.21% | −6.11 |
| Non-component advisories | 14 | 3.60% | 4.18% | −0.58 |
| Visibility | 12 | 3.10% | 4.97% | −1.87 |
| Steering | 10 | 2.50% | 2.57% | −0.07 |
| Road Wheels | 9 | 2.30% | 0.75% | +1.55 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Joints constant velocity boot severely deteriorated Body, chassis, structure | Minor | 9.2% | £80–250 |
| Windscreen damaged but not adversely affecting driver's view Visibility | Minor | 5.9% | £80–200 |
| Headlamp lens slightly defective Lamps, reflectors and electrical equipment | Minor | 5.0% | £5–25 |
| Ball joint dust cover severely deteriorated Suspension | Minor | 4.2% | £18–45 |
| Coil spring fractured or broken Suspension | Major | 4.2% | £25–65 |
| Malfunction indicator lamp inoperative or indicates a malfunction Noise, emissions and leaks | Major | 4.2% | £3–12 |
| Joints constant velocity boot split or insecure, no longer prevents the ingress of dirt Body, chassis, structure | Major | 3.4% | £80–250 |
| Position lamp not working Lamps, reflectors and electrical equipment | Major | 3.4% | £5–25 |
| Ball joint excessively worn Suspension | Major | 2.5% | £18–45 |
| Rbt (sp) efficiency below requirements Brakes | Major | 2.5% | £45–110 |
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 |
|---|---|---|---|
| Rigid brake pipes excessively corroded Brakes | Advisory | 25.2% | £80–180 |
| Pins and bushes pin or bush excessively worn Suspension | Advisory | 21.0% | £40–150 |
| Engine oil leaks leaking excessively from engine Noise, emissions and leaks | Advisory | 19.3% | £200–700 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 16.8% | £45–110 |
| Ball joint excessively worn Suspension | Advisory | 13.4% | £18–45 |
| Service brake performance excessively binding Brakes | Advisory | 12.6% | £60–150 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 2 | 100.0% | 23,978 mi |
| 30-60k | 9 | 66.7% | 48,777 mi |
| 60-90k | 30 | 83.3% | 76,256 mi |
| 90-120k | 37 | 70.3% | 104,583 mi |
| 120k+ | 39 | 71.8% | 150,670 mi |
Source: 119 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.
2004 166 MOT questions
What is the MOT pass rate for a 2004 Alfa Romeo 166?
73.1% of the 119 2004 Alfa Romeo 166 tests in this dataset passed, against a national average of 72.2% for cars first used in 2004. First-attempt pass rate: 66.3%.
What are the most common MOT failures on a 2004 Alfa Romeo 166?
The three most recorded items are joints constant velocity boot severely deteriorated (9.24%), windscreen damaged but not adversely affecting driver's view (5.88%), headlamp lens slightly defective (5.04%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2004 Alfa Romeo 166 MOT pass rate?
Yes. Cars under 30,000 miles passed 100.0% of the time, falling to 71.8% for those over 120,000 miles. The median 2004 Alfa Romeo 166 in this dataset had covered 105,416 mi.
Does the season affect the 2004 Alfa Romeo 166 MOT pass rate?
Tests recorded in the winter months (October–March) passed 74.6% of the time; summer months (April–September) passed 71.2%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.