MOT advisory · manual section 5.3.6

Component mounting prescribed area is corroded but not considered excessive

What this MOT advisory means, how often testers record it and what the usual repair costs. From 130,233,413 DVSA MOT tests taken 2022 to 2025.

MOT data updated 28 September 2026

As an advisory, per 100 MOTs (n=130,233,413)0.63

Most often at25 years

Times recorded818,519

Times recorded adds every DVSA code with this wording, so a test can record it more than once, for example on two wheels under separate codes.

What it means

This is an advisory: the car passes its MOT, and the tester is warning about the part. An advisory is something the tester noticed that could become a defect later. The car passes its MOT. The advice is to monitor the part and repair it if it gets worse.

When it gets worse, the tester records it as a fail: Component mounting prescribed area excessively corroded significantly reducing structural strength.

Springs, shock absorbers, arms, bushes and ball joints hold each wheel in place and control how it moves. Wear lets a wheel move in ways it should not, and corrosion can weaken springs and mounting points.

The tester fails the car when the part reaches the point the MOT inspection manual describes (section 5.3.6):

The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired

Read this section of the MOT inspection manual on GOV.UK

The DVSA codes counted on this page: the manual item and the defect text as DVSA records them. The heading above joins the two, as a certificate does; the tester also adds the position, such as nearside front.
Result	Manual item	DVSA defect text	Records
Advisory	Component mounting prescribed areas	prescribed area is corroded but not considered excessive (5.3.6)	818,519

Got an MOT advisory or defect on a certificate? Paste it into the MOT advisory checker to see what it means.

How common it is by age

Testers record it most at 25 years: 4.20 per 100 MOTs (n=313,355 tests at that age).

Per 100 MOT tests of cars at each age, all makes. We show no figure below 20 tests.
Age	Advisory per 100	Tests (n)
4 years	0.001	8,699,937
5 years	0.001	9,425,360
6 years	0.004	10,382,720
7 years	0.011	10,537,318
8 years	0.028	10,440,457
9 years	0.063	9,949,012
10 years	0.13	9,049,507
11 years	0.25	8,087,514
12 years	0.42	7,303,151
13 years	0.67	6,612,160
14 years	1.05	6,054,526
15 years	1.46	5,591,675
16 years	1.92	4,858,625
17 years	2.35	4,040,458
18 years	2.76	3,261,622
19 years	3.12	2,479,858
20 years	3.39	1,845,952
21 years	3.59	1,321,417
22 years	3.73	913,980
23 years	3.95	619,531
24 years	4.17	428,815
25 years	4.20	313,355

Models that get it most

Each model generation is compared with cars of the same ages and fuel, so older and diesel models are not penalised for their age or fuel. Generations are never pooled.

Model generations with the highest rate as an advisory, against cars of the same ages and fuel. A model’s figure counts this defect only at ages where it is among that model’s 25 most recorded items, and as zero elsewhere, so it is a floor. Tests (n) are all the generation’s MOT tests at ages with at least 1,000 tests each; at least 5,000 in total.
Model	Per 100 MOTs, at least	Same ages and fuel	Times as often	Tests (n)	Ages
Mitsubishi MirageMitsubishi Mirage suspension problems	0.34	0.073	4.6	44,082	3 to 12
Dacia Duster	0.20	0.043	4.5	274,804	3 to 12
Mazda 5Mazda 5 suspension problems	4.66	1.10	4.2	44,929	8 to 18
Mitsubishi Space StarMitsubishi Space Star suspension problems	11.8	3.18	3.7	5,331	18 to 21
Mazda 6Mazda 6 suspension problems	1.96	0.53	3.7	259,157	3 to 20
Ford TransitFord Transit corrosion welding repair Ford Transit suspension problems	2.06	0.59	3.4	1,227,954	3 to 25
Honda FR-VHonda FR-V suspension problems	6.29	1.98	3.1	29,995	13 to 19
Ford KaFord Ka corrosion welding repair Ford Ka suspension problems	1.71	0.60	2.8	743,190	3 to 23
Rover 45Rover 45 suspension problems	9.11	3.30	2.7	7,621	18 to 22
Daihatsu TeriosDaihatsu Terios suspension problems	5.44	1.97	2.7	14,631	14 to 19
Nissan CubeNissan Cube suspension problems	2.35	0.86	2.7	5,737	12 to 15
Toyota AygoToyota Aygo corrosion welding repair Toyota Aygo suspension problems	1.09	0.42	2.5	1,006,151	3 to 20
Isuzu TFIsuzu TF suspension problems	1.59	0.61	2.5	6,237	11 to 14
Mazda BongoMazda Bongo suspension problems	5.08	2.00	2.5	35,066	6 to 25
Mazda 3Mazda 3 suspension problems	1.48	0.60	2.4	435,738	3 to 20
Toyota HiaceToyota Hiace corrosion welding repair Toyota Hiace suspension problems	6.75	2.74	2.4	55,241	12 to 25
Fiat ScudoFiat Scudo suspension problems	4.37	1.80	2.4	32,566	9 to 21
Toyota YarisToyota Yaris suspension problems	2.23	0.93	2.4	1,812,318	3 to 25
SEAT AlhambraSEAT Alhambra corrosion welding repair SEAT Alhambra suspension problems	0.80	0.34	2.3	110,632	3 to 20
Ford Transit ConnectFord Transit Connect corrosion welding repair Ford Transit Connect suspension problems	1.60	0.70	2.2	676,611	3 to 22

Read this with care. A fail rate is not a measure of build quality. How far cars are driven, how they are used and how well owners maintain them all change it, and wear items such as tyres and brake pads are common fails. Compare a model only with cars of the same age. Methodology and limits.

Repair and cost

The usual repair is corrosion welding repair.

No public source records the price of this whole job, and the time it takes varies from car to car, so we do not publish a single figure. Garages charge by the hour, so ask for a quote that lists labour time and parts. The rates below are what UK garages charge per hour.

Local garage labour, per hour (65 shops)£78

Local garage, middle half£70 to £96

Main dealer labour, per hour (62 shops)£156

Main dealer, middle half£144 to £174

Median hourly rate charged for car repairs, from 1,058 local garage and 953 main dealer price quotes collected by the ONS, September 2025 to August 2026. The same shops are priced each month, so the number of shops is the real sample.

Corrosion welding repair: cost and the models that need it more often

Related MOT defects

Suspension arm pin or bush worn but not resulting in excessive movement4.92 per 100
Coil spring corroded3.09 per 100
Shock absorber has light misting of oil2.89 per 100
Coil spring fractured or broken2.37 per 100
Sub-frame corroded but not seriously weakened1.89 per 100
Suspension arm ball joint excessively worn1.41 per 100
Suspension arm ball joint has slight play1.31 per 100
Suspension arm pin or bush excessively worn1.19 per 100
Anti-roll bar linkage ball joint has slight play1.18 per 100
Suspension arm corroded but not seriously weakened1.08 per 100

All axles, wheels, tyres and suspension defects All MOT defects Car repair costs

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Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT test data, class 4 normal MOT tests, 2022 to 2025, and the MOT inspection manual published on GOV.UK. Prices: ONS consumer price inflation price quotes, September 2025 to August 2026, UK.

MOT data updated 28 September 2026. Prices updated 22 September 2026.

Not affiliated with or endorsed by DVSA or the Office for National Statistics. How we calculate these figures · Data sources