The picture

Cb600: above-average pass rates, with caveats

Across 1,515 MOT tests, the Cb600 returns 83.0% first-time pass — above the UK fleet average. The single most-logged Major fail is a non-functioning shock absorber. Tyre tread under the limit and a missing rear reflector round out the top three. Average tested mileage sits at 28,356, 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.

ABI Insurance Group

Group 10–26

Below the fleet average — generally reasonable to insure. Lower groups cost less to insure; UK fleet average is around Group 22.

Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →

10–26

out of 50

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Top ten reasons for rejection.

Filter failures:

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

01

A shock absorber not functioning or leaking severely

32 occurrences · 1.4% of tests
02

Rate of flashing not between 60 and 120 times per minute

25 occurrences · 1.1% of tests
03

Tyre tread depth not in accordance with the requirements

25 occurrences · 1.1% of tests
04

Brake lining or pad worn below 1.0mm

18 occurrences · 0.8% of tests
05

Reflector missing or reflecting white to the rear

17 occurrences · 0.8% of tests
06

Number plate does not conform to the specified requirements

16 occurrences · 0.7% of tests
07

Excessive fluctuation in brake effort through each wheel revolution

15 occurrences · 0.7% of tests
08

A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

14 occurrences · 0.6% of tests
09

Audible warning not working

13 occurrences · 0.6% of tests
10

Projected beam image is obviously incorrect

11 occurrences · 0.5% 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 Cb600'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 →

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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

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

Item 02 · 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

My Motor World · affiliate

Parts & supplies for this fix

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Draper

Draper Drain Plug Key, 3/8 Square x 3/8 Sq. Dr.

£15.39

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Hycote

Hycote Honda Nighthawk Black Pearlescent Double Acrylic Spray Paint 150ml

£6.59

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Hycote Honda Milano Red Double Acrylic Spray Paint 150ml

£6.59

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Hycote Honda Satin Silver Metallic Double Acrylic Spray Paint 150ml

£6.59

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Click Mechanic · affiliate

Book a mobile mechanic

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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.

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Buying or keeping a Cb600?

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 Cb600 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.