Performance by cohort

3 year bands · 7,099 tests

Pass rate is broadly flat across the cohorts — new and old Street examples track each other at the test bay.

Pre-2018 cohort 3,333

Pass

90.6%

Fail

4.1%

PRS

5.0%

Avg mileage at test

11,116 mi

2018–2020 cohort 3,641

Pass

91.7%

Fail

3.9%

PRS

4.0%

Avg mileage at test

7,954 mi

2021+ cohort 125

Pass

91.2%

Fail

4.8%

PRS

3.2%

Avg mileage at test

4,829 mi

Cohort = vehicle's first-registration year band. Same model, different generations of build.

The picture

Street: a strong MOT record by UK norms

Across 5,173 MOT tests, the Street returns 91.2% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a missing rear reflector. Brake pads worn below 1.0 mm and tyre tread under the limit round out the top three. Average tested mileage sits at 8,174, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.

Top ten reasons for rejection.

Filter failures:

Hide wear items to see the model's real defects.

01

Brake lining or pad worn below 1.0mm

39 occurrences · 0.5% of tests
02

Audible warning not working

31 occurrences · 0.4% of tests
03

Tyre tread depth not in accordance with the requirements

30 occurrences · 0.4% of tests
04

Reflector missing or reflecting white to the rear

29 occurrences · 0.4% of tests
05

Excessive fluctuation in brake effort through each wheel revolution

21 occurrences · 0.3% of tests
06

Reflector colour or position not in accordance with the requirements

17 occurrences · 0.2% of tests
07

A headlamp missing, inoperative or more than ½ not functioning in the case of LED

16 occurrences · 0.2% of tests
08

A rear registration plate lamp throwing direct white light to the rear

16 occurrences · 0.2% of tests
09

Number plate does not conform to the specified requirements

15 occurrences · 0.2% of tests
10

A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources

13 occurrences · 0.2% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

Worst-case fix budget · top 2 failures

£140–£255

If every one of this Street's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →

Try the calculator

Build your own retest budget.

Year-band analysis

Best year to buy. Worst to avoid.

First-time MOT pass rate split by registration band. A 1.0-point gap between bands is modest — the year you buy Triumph Street makes a small but real difference to MOT outcomes.

Best band to buy

91.7%

2018–2020 registration

the 2018–2020 band climbs to 91.7% — a 1.0-point improvement. Failures here are mostly wear items: less than 1.0 mm thick, tread depth is below minimum requirements of 1.0mm — the structural issues that drag down older examples don't appear in the top-10 for this band. The stricter post-2018 MOT test rules meant manufacturers had to tighten up emissions and electrical checks, but this band still shows far fewer major failures on suspension and bodywork than the older fleet.

Band to be cautious about

90.6%

Pre-2018 registration

On the older band (pre-2018), the data shows a 90.6% pass rate against a fleet average of 91.7% on the newer band. The main culprits logged at test: not working, less than 1.0 mm thick, and tread depth is below minimum requirements of 1.0mm. Average mileage on test for this band is 11,116 miles — high-mileage wear items are a recurring theme.

Best band to buy: 2018-2020 (91.7% first-time pass). Worst band to avoid: pre-2018 (90.6% pass). That's a 1.0-point spread across 3,333 older tests and 3,641 newer ones — year of build makes a material difference on this model.

Year-spread leaderboard →

Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Item 01 · Amazon UK

Brake pad measurement gauge

Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.

Search Amazon UK

Item 02 · Amazon UK

Digital tyre-tread depth gauge

Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.

Search Amazon UK

My Motor World · affiliate

Parts & supplies for this fix

Affiliate links — small commission, no extra cost to you.

Denso

Denso W14E Spark Plug (Single)

£1.09

View at My Motor World →

Denso

Denso W16EX-U Spark Plug (Single)

£1.09

View at My Motor World →

Denso

Denso W16FSR Spark Plug (Single)

£1.09

View at My Motor World →

Denso

Denso W9LM-US Spark Plug (Single)

£1.09

View at My Motor World →

Click Mechanic · affiliate

Book a mobile mechanic

Affiliate links — small commission, no extra cost to you.

Mobile mechanic · UK-wide

Book a mechanic at your door.

Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.

Get a quote →

Buying or keeping a Street?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a Street and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.