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MOT reliability

Triumph 1800

7 vehicles · 35 completed MOT tests analysed
77%
MOT pass rate

Based on 7 Triumph 1800 vehicles and 35 completed MOT tests, the Triumph 1800 has an overall 77% pass rate, with an average recorded mileage of 52,174 miles.

7
Vehicles
35
MOT tests
338
Avg miles / year
1
Faults per test
3%
Dangerous-fault share

Triumph 1800 problem areas

Where faults occur most across all Triumph 1800 MOT tests:

  • Other106%
  • Brakes12%
  • Steering6%
  • Tyres, wheels & suspension6%
  • Body & structure3%
  • Emissions & nuisance3%

Fuel types: Petrol (7)

Most common Triumph 1800 MOT faults

These are the faults and advisories recorded most often across Triumph 1800 MOT tests:

  1. Parking brake: efficiency below requirements (3.7.C.1b) (3 times)
  2. Nearside Front lift in king pin (2 times)
  3. Nearside Semaphore indicator arm does not extend smoothly (1.4.C.1a) (1 times)
  4. Steering box has relative movement between sector shaft and the drop arm (2.2.B.1b) (1 times)
  5. Front Brakes imbalanced across an axle (1.2.1 (b) (i)) (1 times)
  6. Nearside Front Outer Track rod end ball joint dust cover excessively damaged or deteriorated so that it no longer prevents the ingress of dirt (2.1.3 (g) (ii)) (1 times)
  7. Nearside Front Suspension component pin or bush excessively worn king pin up lift and side movement (5.3.4 (a) (i)) (1 times)
  8. Nearside Rear Service brake excessively binding in reverse (1.2.1 (f)) (1 times)
  9. Offside Front Outer Track rod end ball joint dust cover excessively damaged or deteriorated so that it no longer prevents the ingress of dirt (2.1.3 (g) (ii)) (1 times)
  10. Offside Front Suspension component pin or bush excessively worn king pin up lift (5.3.4 (a) (i)) (1 times)
  11. Offside Vehicle structure corroded to the extent that the rigidity of the assembly is significantly reduced (6.1.1 (c) (i)) (1 times)
  12. Oil leak, but not excessive from engine gear box and rear diff (8.4.1 (a) (i)) (1 times)
  13. Rear Brakes imbalanced across an axle (1.2.1 (b) (i)) (1 times)
  14. Nearside Front Brake pipe connection leaking on a hydraulic braking system (1.1.11 (b) (ii)) (1 times)
  15. Nearside Axle king pin has slight play in pin and/or bush (2.5.A.3a) (1 times)

Triumph 1800 pass rate by registration year

YearVehiclesTestsPass rateAvg mileage
1950 1 10 60% 162,921
1948 4 21 81% 42,742
1947 2 4 100% 15,665

Triumph 1800 reliability FAQ

Across 7 Triumph 1800 vehicles in our MOT data, 77% pass the MOT (a 23% failure rate), with about 1 faults or advisories recorded per test.

The most frequently recorded Triumph 1800 MOT issues are: Parking brake: efficiency below requirements (3.7.C.1b); Nearside Front lift in king pin; Nearside Semaphore indicator arm does not extend smoothly (1.4.C.1a).

The typical Triumph 1800 in our data has covered around 52,174 miles.

Compare the Triumph 1800

See how the Triumph 1800 stacks up against other Triumph models on MOT reliability:

1800 vs Toledo 1800 vs Unknown 1800 vs 2000 1800 vs 1500

Check a specific Triumph 1800

Enter a registration to see that exact vehicle's full MOT history, advisories and recurring faults.

See all Triumph models · Learn about common MOT failures · what an MOT checks