Mercedes300 MOT results

In 2025, 78.2% of Mercedes 300 MOT tests were passed first time, better than the 72.1% for cars of the same age. 4.0% had at least one dangerous defect (5.5% for cars the same age). The typical Mercedes 300 tested was 35 years old with 105,000 miles. Based on 2,623 initial MOT tests in Great Britain.

RegisterHow many Mercedes 300 cars are on the road

First-time pass: 78.2%no defects to fix
Cars the same age: 72.1%first-time pass
Fixed at the test: 3.6%passed after repair
Failed: 18.3%needed a retest
Dangerous defect: 4.0%same age 5.5%
Typical mileage: 105,000at the test

Great Britain · DVSA MOT tests · 2025

First-time pass rate by year first registered

Mercedes 300All cars first registered that year

Year first registered	Tests	First-time pass	All cars
1993	181	72.9%	68.6%
1992	351	77.5%	68.9%
1991	337	74.8%	71.7%
1990	273	74.0%	72.7%
1989	521	81.0%	73.4%
1988	366	79.8%	73.5%
1987	278	83.8%	74.3%
1986	161	77.0%	73.6%

Years with fewer than 30 tests are left out.

Great Britain · DVSA MOT tests · 2025

By age at the test

Mercedes 300All cars that age

Age	Tests	First-time pass	All cars	Typical miles
3-4 years	4	100.0%	87.4%	22,900
5-9 years	14	92.9%	79.1%	39,400
10-14 years	15	60.0%	65.7%	151,400
15-19 years	21	71.4%	57.6%	75,600
20-29 years	24	83.3%	59.6%	114,600
30-39 years	2,508	78.0%	71.3%	105,400
40+ years	36	86.1%	82.0%	94,100

Great Britain · DVSA MOT tests · 2025

Where they’re tested

Colour shows how common the Mercedes 300 is among cars tested in each area, against its share across Great Britain: 2× means twice as common as usual.

under 0.5×
0.5×–0.8×
0.8×–1.25×
1.25×–2×
2× or more
Fewer than 5 tests
None tested

Postcode area of the garage that did the test, not where the owner lives. Hover over or tap an area for its figures.

Postcode area	Region	Tests	Share	vs all cars	First-time pass
B Birmingham	West Midlands	69	2.6%	0.8×	79.7%
TN Tonbridge	South East	68	2.6%	2.0×	83.8%
CV Coventry	West Midlands	67	2.6%	1.7×	92.5%
GU Guildford	South East	55	2.1%	1.5×	85.5%
KT Kingston upon Thames	London	53	2.0%	2.5×	79.2%
CM Chelmsford	East of England	51	1.9%	1.6×	88.2%
RG Reading	South East	51	1.9%	1.3×	80.4%
IP Ipswich	East of England	50	1.9%	1.6×	72.0%
HP Hemel Hempstead	South East	49	1.9%	1.9×	81.6%
NR Norwich	East of England	49	1.9%	1.4×	79.6%
S Sheffield	Yorkshire and the Humber	49	1.9%	0.8×	77.6%
NG Nottingham	East Midlands	47	1.8%	1.0×	83.0%
LE Leicester	East Midlands	46	1.8%	1.0×	78.3%
RH Redhill	South East	44	1.7%	1.6×	70.5%
PE Peterborough	East of England	43	1.6%	0.9×	72.1%
NN Northampton	East Midlands	40	1.5%	1.1×	75.0%
BH Bournemouth	South West	38	1.4%	1.4×	65.8%
GL Gloucester	South West	38	1.4%	1.2×	78.9%
NE Newcastle upon Tyne	North East	38	1.4%	0.9×	68.4%
OX Oxford	South East	38	1.4%	1.3×	71.1%
PO Portsmouth	South East	37	1.4%	1.0×	62.2%
TW Twickenham	London	37	1.4%	1.9×	70.3%
BN Brighton	South East	35	1.3%	1.1×	71.4%
NW London NW	London	35	1.3%	2.0×	80.0%
UB Southall	London	35	1.3%	2.2×	94.3%
YO York	Yorkshire and the Humber	35	1.3%	1.4×	80.0%
SG Stevenage	East of England	34	1.3%	1.8×	76.5%
SL Slough	South East	34	1.3%	1.8×	85.3%
EX Exeter	South West	33	1.3%	1.1×	63.6%
N London N	London	32	1.2%	1.8×	84.4%
EN Enfield	London	31	1.2%	2.0×	96.8%
RM Romford	London	30	1.1%	1.4×	83.3%
SO Southampton	South East	30	1.1%	0.9×	80.0%
SW London SW	London	30	1.1%	2.7×	66.7%
CB Cambridge	East of England	28	1.1%	1.5×	–
E London E	London	28	1.1%	1.3×	–
SK Stockport	North West	28	1.1%	1.1×	–
CF Cardiff	Wales	27	1.0%	0.6×	–
SE London SE	London	27	1.0%	1.3×	–
CT Canterbury	South East	26	1.0%	1.3×	–
LS Leeds	Yorkshire and the Humber	26	1.0%	0.9×	–
MK Milton Keynes	South East	26	1.0%	0.9×	–
SS Southend-on-Sea	East of England	26	1.0%	1.1×	–
ME Rochester	South East	24	0.9%	0.9×	–
CR Croydon	London	23	0.9%	1.3×	–
EH Edinburgh	Scotland	23	0.9%	0.7×	–
ST Stoke-on-Trent	West Midlands	23	0.9%	0.8×	–
W London W	London	23	0.9%	3.3×	–
IG Ilford	London	22	0.8%	1.9×	–
M Manchester	North West	22	0.8%	0.6×	–
WR Worcester	West Midlands	22	0.8%	1.4×	–
CO Colchester	East of England	21	0.8%	1.0×	–
DN Doncaster	Yorkshire and the Humber	21	0.8%	0.6×	–
BS Bristol	South West	20	0.8%	0.4×	–
HA Harrow	London	20	0.8%	1.3×	–
LL Llandudno	Wales	20	0.8%	0.8×	–
DA Dartford	South East	19	0.7%	1.0×	–
G Glasgow	Scotland	19	0.7%	0.5×	–
SA Swansea	Wales	19	0.7%	0.6×	–
WV Wolverhampton	West Midlands	19	0.7%	1.1×	–
DL Darlington	North East	18	0.7%	1.2×	–
PL Plymouth	South West	18	0.7%	0.7×	–
TQ Torquay	South West	17	0.6%	1.3×	–
PR Preston	North West	16	0.6%	0.7×	–
SN Swindon	South West	16	0.6%	0.7×	–
TA Taunton	South West	16	0.6%	0.9×	–
WF Wakefield	Yorkshire and the Humber	16	0.6%	0.7×	–
AB Aberdeen	Scotland	15	0.6%	0.8×	–
AL St Albans	East of England	15	0.6%	1.3×	–
BA Bath	South West	15	0.6%	0.7×	–
HR Hereford	West Midlands	15	0.6%	1.5×	–
SP Salisbury	South West	15	0.6%	1.2×	–
WA Warrington	North West	15	0.6%	0.6×	–
BD Bradford	Yorkshire and the Humber	14	0.5%	0.6×	–
BR Bromley	London	14	0.5%	1.5×	–
DE Derby	East Midlands	14	0.5%	0.4×	–
DT Dorchester	South West	14	0.5%	1.4×	–
NP Newport	Wales	14	0.5%	0.6×	–
TR Truro	South West	14	0.5%	0.9×	–
WS Walsall	West Midlands	14	0.5%	0.7×	–
CH Chester	North West	13	0.5%	0.5×	–
DY Dudley	West Midlands	13	0.5%	0.7×	–
TS Teesside	North East	13	0.5%	0.5×	–
CW Crewe	North West	12	0.5%	0.8×	–
BB Blackburn	North West	11	0.4%	0.5×	–
BL Bolton	North West	11	0.4%	0.6×	–
L Liverpool	North West	11	0.4%	0.4×	–
HG Harrogate	Yorkshire and the Humber	10	0.4%	1.4×	–
KY Kirkcaldy	Scotland	10	0.4%	0.7×	–
SY Shrewsbury	West Midlands	10	0.4%	0.6×	–
HU Hull	Yorkshire and the Humber	9	0.3%	0.5×	–
KA Kilmarnock	Scotland	9	0.3%	0.6×	–
LN Lincoln	East Midlands	9	0.3%	0.6×	–
WD Watford	East of England	9	0.3%	0.9×	–
IV Inverness	Scotland	8	0.3%	0.7×	–
PH Perth	Scotland	8	0.3%	1.0×	–
TF Telford	West Midlands	8	0.3%	0.8×	–
CA Carlisle	North West	7	0.3%	0.5×	–
DH Durham	North East	7	0.3%	0.5×	–
HD Huddersfield	Yorkshire and the Humber	7	0.3%	0.7×	–
LU Luton	East of England	7	0.3%	0.4×	–
WN Wigan	North West	7	0.3%	0.6×	–
LA Lancaster	North West	6	0.2%	0.4×	–
ML Motherwell	Scotland	6	0.2%	0.5×	–
OL Oldham	North West	6	0.2%	0.3×	–
FY Blackpool	North West	5	0.2%	0.5×	–
DD Dundee	Scotland	fewer than 5	–	–	–
DG Dumfries	Scotland	fewer than 5	–	–	–
FK Falkirk	Scotland	fewer than 5	–	–	–
HX Halifax	Yorkshire and the Humber	fewer than 5	–	–	–
KW Kirkwall	Scotland	fewer than 5	–	–	–
LD Llandrindod Wells	Wales	fewer than 5	–	–	–
PA Paisley	Scotland	fewer than 5	–	–	–
SM Sutton	London	fewer than 5	–	–	–
SR Sunderland	North East	fewer than 5	–	–	–
TD Galashiels	Scotland	fewer than 5	–	–	–
ZE Shetland	Scotland	fewer than 5	–	–	–

Region	Tests	Share	vs all cars	First-time pass
Scotland	119	4.5%	0.6×	77.3%
North East	79	3.0%	0.8×	73.4%
North West	170	6.5%	0.6×	81.2%
Yorkshire and the Humber	190	7.2%	0.8×	79.5%
Wales	81	3.1%	0.6×	76.5%
West Midlands	260	9.9%	1.0×	81.5%
East Midlands	156	5.9%	0.9×	78.2%
East of England	333	12.7%	1.2×	78.7%
London	443	16.9%	1.8×	80.4%
South East	536	20.4%	1.3×	78.5%
South West	254	9.7%	0.9×	68.9%

Great Britain · DVSA MOT tests · 2025

Where they fail

Share of tests with at least one failure in each area, against cars of the same age.

Mercedes 300Cars the same age

Lights and electrics10.6%14.8%
Brakes6.9%9.1%
Suspension6.0%8.1%
Body and structure4.7%7.4%
Visibility (wipers, glass, mirrors)4.1%5.9%
Emissions and leaks3.5%5.0%
Steering2.0%3.4%
Tyres1.8%2.0%
Seat belts and airbags1.0%1.7%

A test can fail in more than one area. Failures fixed during the test are included.

Great Britain · DVSA MOT tests · 2025

Most common failures

The 10 defects that failed Mercedes 300 tests most often, as a share of all tests.

Failure	Tests	Cars the same age	vs same age	Marked dangerous
Headlamp aim: too low Lights and electrics	2.1%	1.5%	1.4×	0.0%
Position lamp: not working Lights and electrics	1.9%	2.7%	0.7×	0.0%
Rear fog lamp: not working Lights and electrics	1.6%	2.5%	0.6×	0.0%
Wipers: does not clear the windscreen effectively Visibility (wipers, glass, mirrors)	1.6%	2.0%	0.8×	0.0%
Ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt Suspension	1.6%	0.8%	2.0×	0.0%
Component mounting prescribed areas: prescribed area excessively corroded significantly reducing structural strength Suspension	1.5%	2.7%	0.6×	0.0%
Non catalyst emissions: emissions carbon monoxide content excessive Emissions and leaks	1.4%	2.0%	0.7×	0.0%
Washers: provides insufficient washer liquid Visibility (wipers, glass, mirrors)	1.4%	1.5%	0.9×	0.0%
Stop lamp: not working Lights and electrics	1.1%	1.5%	0.7×	0.0%
Service brake performance: excessively binding Brakes	1.1%	1.6%	0.7×	0.0%

“vs same age” compares this model with cars of the same age: 2.0× means twice as often. “Marked dangerous” is how often the tester recorded that failure as dangerous.

Great Britain · DVSA MOT tests · 2025

Most common advisories

Things the tester noted to watch, which don’t fail the test.

Advisory	Tests
Engine oil leaks: leak, but not excessive	14.5%
Rigid brake pipes: corroded, covered in grease or other material	10.9%
Coil spring: corroded	7.4%
Condition: slightly damaged/cracking or perishing	6.6%
Pins and bushes: pin or bush worn but not resulting in excessive movement	5.0%
Exhaust system: has a minor leak of exhaust gases	4.8%
Tread depth: worn close to legal limit/worn on edge	4.6%
Wheel bearings: has slight play	4.3%
Brake discs: worn, pitted or scored, but not seriously weakened	3.2%
Transmission oil leaks: leak, but not excessive	2.9%

Great Britain · DVSA MOT tests · 2025

By fuel

Fuel	Tests	First-time pass
Petrol	2,166	80.1%
Diesel	443	68.2%

Fuels with fewer than 30 tests are left out. Different fuels often mean different ages, so compare with care.

MOT results for every model