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J129 GMP

1992 Dennis Unknown

White Diesel 5900cc
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MOT Status

Valid
Expires29 Aug 2026
Tests5 (3 pass, 2 fail)
Pass rate60%

Mileage

397,175 mi
Last recorded397,175 miles
Recorded on29 Aug 2025
4 checks still locked for this Dennis
Stolen
Finance
Write-off
Keepers
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Vehicle Details

RegistrationJ129 GMP
MakeDennis
ModelUnknown
Year1992
ColourWhite
Fuel typeDiesel
Engine5,900cc
View full Dennis Unknown reliability data

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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

3 pass 2 fail
Pass 29 Aug 2025 397,175 miles

Offside Rear Position lamp with a multiple light source up to 1/2 not functioning (4.2.1 (a) (i))

Fail 29 Aug 2025 397,175 miles

Offside Rear Outline marker lamp not working (4.2.1 (a) (ii))

Offside Rear Position lamp with a multiple light source up to 1/2 not functioning (4.2.1 (a) (i))

Pass 30 Aug 2024 396,816 miles

Nearside Front Leaf spring has slight wear in a shackle pin and/or bush rear cup bush of spring (5.3.4 (a) (i))

Offside Fluid leak, but not excessive (8.4.1 (a) (i))

Offside Front Leaf spring has slight wear in a shackle pin and/or bush rear cup bush of spring (5.3.4 (a) (i))

Rear Vehicle structure is corroded but structural rigidity is not significantly reduced vairious areas (6.1.1 (c) (i))

Fail 30 Aug 2024 396,816 miles

Nearside Front Leaf spring has slight wear in a shackle pin and/or bush rear cup bush of spring (5.3.4 (a) (i))

Offside Fluid leak, but not excessive (8.4.1 (a) (i))

Offside Front Leaf spring has slight wear in a shackle pin and/or bush rear cup bush of spring (5.3.4 (a) (i))

Offside Rear Position lamp not working (4.2.1 (a) (ii))

Rear Vehicle structure is corroded but structural rigidity is not significantly reduced vairious areas (6.1.1 (c) (i))

Pass 2 Jun 2023 396,692 miles

Nearside Front Leaf spring has slight wear in a shackle pin and/or bush rear cup bush of spring (5.3.4 (a) (i))

Offside Fluid leak, but not excessive (8.4.1 (a) (i))

Offside Front Leaf spring has slight wear in a shackle pin and/or bush rear cup bush of spring (5.3.4 (a) (i))

Offside Rear Vehicle structure is corroded but structural rigidity is not significantly reduced lower chassis rail (6.1.1 (c) (i))

How Reliable is the Dennis Unknown?

Based on 1,061 MOT tests across 474 vehicles.

81.4%
Pass Rate
1,406
Miles/Year
25
Year Lifespan
474
On UK Roads

Top MOT Failure Points

outline marker lamp(s) not working 6
Service brake: efficiency below requirements 6
position lamp(s) not working 6
Full Dennis Unknown reliability report

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J129 GMP is a 1992 Dennis Unknown in White with a 5,900cc diesel engine. This vehicle has been through 5 MOT tests with a personal pass rate of 60%.

The most common reason a Dennis Unknown fails its MOT is outline marker lamp(s) not working, accounting for 6 recorded failures. If you're considering buying J129 GMP, it's worth having these areas checked by a mechanic before committing.

The Dennis Unknown typically stays on UK roads for around 25 years. At 34 years old, this Dennis Unknown is approaching the upper end of the typical lifespan for this model.

Frequently Asked Questions

How do I check the history of J129 GMP?

You can check the full history of J129 GMP by running a full vehicle check. This shows you finance, stolen, write-off, MOT history, mileage records and more.

What year was J129 GMP registered?

J129 GMP is a 1992 Dennis Unknown, first registered on 30 December 1992.

Is J129 GMP safe to buy?

The MOT history for J129 GMP shows 5 tests with a 60% pass rate. To check for outstanding finance, stolen markers, write-off history and mileage discrepancies, run a full vehicle check.

Does J129 GMP 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 J129 GMP. 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.