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THB 929S

1977 Triumph Stag

Brown Petrol 2997cc
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MOT Status

Valid
Expires12 Mar 2027
Tests21 (15 pass, 6 fail)
Pass rate71.4%

Mileage

77,132 mi
Last recorded77,132 miles
Recorded on13 Mar 2026
Typical for 1977 Triumph Stag60,708 mi

Above average mileage for this year

4 checks still locked for this Triumph
Stolen
Finance
Write-off
Keepers
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Vehicle Details

RegistrationTHB 929S
MakeTriumph
ModelStag
Year1977
ColourBrown
Fuel typePetrol
Engine2,997cc

All premium checks include

50+ data points
Finance Check (Experian) Insurance Write-off Salvage Auction Stolen Check Previous Owners Ex-Taxi, Police, NHS Mileage Anomaly Import / Export Scrapped Check Plate Changes

MOT History

15 pass 6 fail
Pass 13 Mar 2026 77,132 miles
Pass 27 Feb 2025 77,061 miles

Nearside Front washer jet requires adjusting

Windscreen wiper blade defective both (3.4 (b) (i))

Pass 24 May 2024 76,948 miles
Pass 6 Mar 2023 76,904 miles
Pass 10 Mar 2022 76,843 miles

Nearside Rear Sub-frame pin or bush worn but not resulting in excessive movement (5.3.4 (a) (i))

Offside Rear Sub-frame pin or bush worn but not resulting in excessive movement (5.3.4 (a) (i))

Offside Rear Wheel bearing has slight play (5.1.3 (a) (i))

Pass 16 Feb 2021 76,728 miles

Front Registration plate deteriorated but not likely to be misread cracked (0.1 (b))

Nearside Rear Sub-frame pin or bush worn but not resulting in excessive movement (5.3.4 (a) (i))

Offside Rear Sub-frame pin or bush worn but not resulting in excessive movement (5.3.4 (a) (i))

Offside Rear Wheel bearing has slight play (5.1.3 (a) (i))

seat belts slow to retract

Pass 18 Mar 2020 76,661 miles

Front Registration plate deteriorated but not likely to be misread (0.1 (b))

Mounting bushes worn on rear cross member/subframe

Offside Front Windscreen wiper blade defective worn (3.4 (b) (i))

Offside Rear Wheel bearing has slight play (5.1.3 (a) (i))

Seat belts slow to retract

Fail 10 Mar 2020 76,646 miles

Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))

Nearside Front Windscreen wiper does not clear the windscreen effectively split (3.4 (b) (ii))

Nearside Rear Service brake lagging in operation (1.2.1 (d))

Nearside Rear Stop lamp(s) not working (4.3.1 (a) (ii))

Rear Brakes imbalanced across an axle Axle 2 (1.2.1 (b) (i))

Front Registration plate deteriorated but not likely to be misread (0.1 (b))

Mounting bushes worn on rear cross member/subframe

Offside Front Windscreen wiper blade defective worn (3.4 (b) (i))

Offside Rear Wheel bearing has slight play (5.1.3 (a) (i))

Seat belts slow to retract

Pass 15 Mar 2019 76,601 miles
Fail 12 Mar 2019 76,585 miles

Front Brakes imbalanced across an axle pulls to the left (1.2.1 (b) (i))

Nearside Headlamp aim projected beam image is obviously incorrect (4.1.2 (c))

Offside Headlamp aim projected beam image is obviously incorrect (4.1.2 (c))

Rear Brakes imbalanced across an axle pulls to the right (1.2.1 (b) (i))

Pass 14 Mar 2018 76,490 miles

Nearside front wiper blade split

Fail 14 Mar 2018 76,490 miles

Nearside Headlamp not working on main beam (1.7.5a)

Nearside front wiper blade split

Windscreen washer provides insufficient washer liquid (8.2.3)

Pass 11 Apr 2017 76,401 miles

Rear fuel hose slightly perished

Pass 17 Mar 2016 76,295 miles
Pass 24 Apr 2015 76,167 miles

Nearside Rear Shock absorber has a slightly worn bush (2.7.4)

Offside Rear Shock absorber has a slightly worn bush (2.7.4)

Fail 13 Feb 2015 76,144 miles

Nearside Front Track rod end ball joint dust cover excessively damaged so that it no longer prevents the ingress of dirt (2.2.C.1c)

Nearside Rear Suspension component mounting prescribed area is excessively corroded (2.4.A.3)

Offside Front Track rod end ball joint dust cover excessively damaged so that it no longer prevents the ingress of dirt (2.2.C.1c)

Offside Rear Suspension component mounting prescribed area is excessively corroded (2.4.A.3)

Offside Rear Tyre tread depth below requirements of 1.6mm (4.1.E.1)

Parking brake: efficiency below requirements (3.7.B.7)

Nearside Front Track rod end ball joint has slight play (2.2.B.1f)

Nearside Rear Shock absorber has a slightly worn bush (2.7.4)

Offside Front Track rod end ball joint has slight play (2.2.B.1f)

Offside Rear Shock absorber has a slightly worn bush (2.7.4)

lare hole on nearside front under flooring

lare hole on offside front under flooring

nearside rear tyre on 3mm

Pass 5 Feb 2014 76,037 miles

Offside Rear Tyre worn close to the legal limit (4.1.E.1)

nearside rear tyre on 3mm

offside front inner sill/flooor rust holed

offside rear parking brake performance low

Fail 27 Jan 2014 76,022 miles

Nearside Front Suspension component mounting prescribed area is excessively corroded (2.4.A.3)

Offside Rear Tyre worn close to the legal limit (4.1.E.1)

nearside rear tyre on 3mm

offside front inner sill/flooor rust holed

offside rear parking brake performance low

Pass 8 Feb 2013 75,962 miles

near side front chassis corroded

Offside Rear Tyre worn close to the legal limit (4.1.E.1)

off side and near side floors and inner sills corroded and holed (front)

off side front outter sill corroded and holed but not in prescribed area

Pass 16 Feb 2012 75,888 miles

Offside Rear Tyre worn close to the legal limit (4.1.E.1)

both front sills/floor rust holed

nearside wiper blade rubber worn

offside front lower valance/body rust holed

Fail 15 Feb 2012 75,886 miles

Offside Front Lower Suspension arm ball joint dust cover excessively damaged so that it no longer prevents the ingress of dirt (2.4.G.2)

Offside Rear Tyre worn close to the legal limit (4.1.E.1)

both front sills/floor rust holed

nearside wiper blade rubber worn

offside front lower valance/body rust holed

How Reliable is the Triumph Stag?

Based on 64,590 MOT tests across 6,070 vehicles.

77.5%
Pass Rate
417
Miles/Year
56
Year Lifespan
6,070
On UK Roads

Top MOT Failure Points

Windscreen washer provides insufficient washer liquid 2,039
Parking brake: efficiency below requirements 1,744
Suspension component mounting prescribed area is excessively corroded 1,507
Stop lamp not working 1,283
brake binding 1,269
Full Triumph Stag reliability report

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THB 929S is a 1977 Triumph Stag in Brown with a 2,997cc petrol engine. This vehicle has been through 21 MOT tests with a personal pass rate of 71.4%.

Across all 1977 Triumph Stag models, the average MOT pass rate is 77.7% with a typical mileage of 60,708 miles. This particular vehicle has a lower pass rate than the average for its year, which may indicate maintenance issues worth investigating.

The most common reason a Triumph Stag fails its MOT is windscreen washer provides insufficient washer liquid, accounting for 2,039 recorded failures. If you're considering buying THB 929S, it's worth having these areas checked by a mechanic before committing.

The Triumph Stag typically stays on UK roads for around 56 years. At 49 years old, this Triumph Stag is approaching the upper end of the typical lifespan for this model.

Frequently Asked Questions

How do I check the history of THB 929S?

You can check the full history of THB 929S by running a full vehicle check. This shows you finance, stolen, write-off, MOT history, mileage records and more.

What year was THB 929S registered?

THB 929S is a 1977 Triumph Stag, first registered on 3 October 1977.

Is THB 929S safe to buy?

The MOT history for THB 929S shows 21 tests with a 71.4% pass rate. To check for outstanding finance, stolen markers, write-off history and mileage discrepancies, run a full vehicle check.

Does THB 929S have outstanding finance?

Finance checks require a premium vehicle report. This checks against all major UK finance providers to see if there is any outstanding finance on THB 929S. If you buy a car with outstanding finance, the finance company can repossess it.

No warranty or guarantee of accuracy is provided for any free data on this page. The data guarantee applies only to information obtained through the purchase of a full check.