Used car guide · 2003–2006

Proton Jumbuck common problems and MOT failures

What goes wrong on a used Proton Jumbuck, year by year: known faults from UK buying guides, the parts flagged at MOT more than on other cars (from 1,460 MOTs done during 2023–2025), and what to check before you buy one.

1,460MOTs done in 2023–2025, all years of this model

Pick the year

Most years have their own guide. The year is when the car was first registered (it’s on the logbook, or check the reg below).

2006200520042003

What usually goes wrong with a Proton Jumbuck?

We haven’t found widely reported faults for the Proton Jumbuck in the UK buying guides we use yet. That doesn’t mean it has none, so check the car carefully and look at the MOT weak spots below.

Common Proton Jumbuck MOT failures to check

Parts flagged at MOT well above the usual rate for cars the same age. From the DVSA’s results for every MOT done in Great Britain during 2023–2025.

  • Anti-roll bar link bushes

    up to 7.7× usual

    Stands out on cars registered in 2006.

    Rough price £100–£280 (pair of drop links) Checkatrade

    At the viewing: Drive slowly over bumps and listen for a knock or rattle from the front. Worn anti-roll bar links are a cheap fix.

  • Exhaust emissions (catalyst)

    up to 4.4× usual

    Stands out on cars registered in 2006.

    Rough price £175–£900 (catalytic converter) ClickMechanic

    At the viewing: Look for smoke when revving the warm engine and for engine or DPF warning lights.

  • Rust around suspension or steering mountings

    up to 2.6× usual

    Stands out on cars registered in 2006.

    Rough price £100–£450 our estimate

    At the viewing: On a straight road the steering wheel should sit straight. Listen for knocks when turning, and check the steering feels even.

  • Exhaust system

    up to 2.1× usual

    Stands out on cars registered in 2006.

    Rough price £100–£500 (pipe or section) ClickMechanic

    At the viewing: Listen for blowing or rattling from underneath at idle, and look for black soot around joints.

  • Engine oil leaks

    up to 1.9× usual

    Stands out on cars registered in 2006.

    Rough price £80–£600 our estimate

    At the viewing: Look under the engine and where the car is usually parked for fresh oil. Ask whether the leak has been looked at.

Proton Jumbuck MOT pass rate by year

Older cars fail more, so compare each year with all cars registered the same year.

YearPass first timeAll cars that yearMOT tests
200655%56% -1505
200561%57% +4294 (small sample)
200455%57% -2458 (small sample)
200354%57% -3203 (small sample)

Questions to ask the seller before buying a Proton Jumbuck

Ask before you travel to see it. A seller who knows the car will have answers, and receipts.

  1. Any recent work on the anti-roll bar link bushes? (Flagged at MOT 7.7× as often on the Proton Jumbuck as on other cars the same age.)
  2. Any recent work on the exhaust emissions (catalyst)? (Flagged at MOT 4.4× as often on the Proton Jumbuck as on other cars the same age.)
  3. Any recent work on the rust around suspension or steering mountings? (Flagged at MOT 2.6× as often on the Proton Jumbuck as on other cars the same age.)
  4. Can I see the service history and receipts for any big jobs?

Looking at a Proton Jumbuck?

Check the actual car: its own MOT history, whether it already shows these weak spots and what to ask the seller. Free, no sign-up.

Where this comes from: MOT figures are the DVSA’s anonymised results for every MOT test done in Great Britain during 2023–2025, grouped by the year each car was first registered. How many are on the road is from the Department for Transport’s vehicle licensing statistics. Known faults are from UK buying guides, in our own words, with links. How we score