Should I check the MOT history before buying a 2004 Mazda B Series?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2004 Mazda B Series?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2004 Mazda B Series?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

How many 2004 Mazda B Series vehicles have had dangerous defects recorded?

38% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2004 Mazda B Series reliable?

Based on MOT data from 730 vehicles, the 2004 Mazda B Series has a first-time MOT pass rate of 71.4%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2004 Mazda B Series?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Mazda B Series (2004)

730 real MOT outcomes analysed • 71.4% first-time pass rate

2004 Mazda B Series

CarHunch analysed 730 real MOT records for the 2004 Mazda B Series. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2004 Mazda B Series is a below-average performer in MOT terms, with a first-time pass rate of just 71.4% against the UK average of 80%—meaning roughly one in four will fail their next test. More concerning is that 37.5% of these vehicles have recorded dangerous defects at some point, well above what you'd consider acceptable for a used purchase.

These trucks have covered reasonable miles for their age (median of 81,000), but they're accumulating an average of 5.16 failures per MOT cycle and 25 advisories, suggesting chronic wear across multiple systems rather than isolated problems. Before buying, run an independent inspection focused on suspension, braking, and structural integrity—the high dangerous-defect rate points to these areas as consistent weak spots.

The 2004 Mazda B Series has a below-average first-time pass rate (71.4% vs ~80% UK average) — check the specific vehicle's full MOT history carefully before buying.

⚠️ Over 1 in 5 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

71.4%

UK average ~80%

Below average

Dangerous (ever)

37.5%

At least once in MOT history

Check this vehicle

Avg failures / car

5.16

Over 17.2 tests on record

High

Typical mileage

81k

Middle half: 62k–107k

For context

⚠️ Below average. More vehicles in this cohort fail their first MOT than typical. Scrutinise this vehicle's history — look for recurring issues, not just the latest result.

🔧 Expect consumable spend. An average of 25 advisories per vehicle tells you wear items (tyres, brakes) get flagged regularly. Budget for them — they're not surprises.

🔍 The dangerous defect figure is real. Most are one-off tyre failures or brake issues — not structural problems. But it's exactly why checking the individual vehicle's history is essential, not optional.

These stats describe 730 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Buyer beware — pass it on

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 730 Mazda B Series cars.

Before you buy a 2004 Mazda B Series

Based on MOT data from 730 vehicles — here's what to check.

📋 Check the full MOT history. 37.5% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Diesel (99%)	725	71.3%	5.18

Colour Breakdown

Based on 9,831 Mazda B Series vehicles registered in the UK — across all years. From DVLA registration records.

Silver 23.8%

2,343

Blue 23%

2,260

Red 19.7%

1,933

White 19.5%

1,919

Green 5%

492

Black 4.2%

415

Grey 3.9%

387

Beige 0.4%

Yellow 0.3%

Orange 0.1%

Cream 0.1%

Brown 0.1%

Mileage Distribution

Most 2004 Mazda B Series vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

80,999

typical

61,928

low mileage

107,308

high mileage

Half of all 2004 Mazda B Series vehicles fall between 61,928 and 107,308 miles.

Is the mileage you're seeing normal?

✓ Under 61,928 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 61,928–107,308 miles — normal for age. This is where most 2004 Mazda B Seriess sit.

⚠ Over 144,865 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2004 Mazda B Series — Still on the Road

Numbers are thinning — 23% of 2004 Mazda B Seriess are still active.

Numbers are declining — 134 vehicles still getting MOTs in 2025 (23% of peak).

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

17.2

Avg MOT tests per vehicle

5.16

Avg failures per vehicle

Avg advisories per vehicle

Other model years — Mazda B Series: All B Series years → Which year to buy? →

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Compare with another model

See how the 2004 Mazda B Series stacks up against a rival.

Buyer beware — pass it on