BMW 3 Series common problems and MOT failures

What usually goes wrong with a BMW 3 Series?

Known faults reported by owners, mechanics and UK buying guides, in our own words. Most apply to certain years or engines only, so check which the car has.

• Timing chain wear

  Cars registered 2012–2019 · 2.0 petrol and diesel

  The four-cylinder petrol and diesel engines can suffer timing chain wear, especially with late oil changes. A failed chain is an engine-out repair.

  At the viewing: Listen for a rattle or whine from the back of the engine, especially from cold. Ask for oil changes on time.

  Source: Parkers: BMW 3 Series (2012-2019) used review

• Airbag, brake, wheel and suspension recalls

  Cars registered 1998–2004 · All engines

  There were a few recalls over the years covering the side airbags, brakes, wheels and suspension.

  At the viewing: Run the free DVSA recall check on the reg.

  Source: What Car?: BMW 3 Series (1998-2005) reliability

• Battery cable and blower wiring recalls

  Cars registered 2005–2011 · All engines

  About 312,000 cars were recalled for a faulty positive battery cable and nearly 280,000 for a heater blower connector. Others covered side airbag wiring, the brake servo, the propshaft joint and VANOS units.

  At the viewing: Ask a BMW dealer to check the VIN for outstanding recalls.

  Source: Haynes: BMW 3 Series Mk5 common problems (2004-2011)

• Timing chain (N47 diesel, 318d/320d)

  Cars registered 2007–2011 · 2.0 diesel (2007 on)

  The 2.0 diesel's timing chain is at the back of the engine and is a known weak point. Replacing it costs around £1,000.

  At the viewing: Start the engine from cold and listen for a rattle from the back.

  Source: Fast Car: BMW 3 Series E90 buying guide

• Blocked EGR valve or particulate filter (diesel)

  Cars registered 2012–2019 · Diesel

  Diesels used mostly for short trips can block the EGR valve or clog the particulate filter, causing poor running.

  At the viewing: Ask what journeys it’s done and watch for warning lights or a lack of power.

  If it needs doing: DPF clean or regeneration, about £160–£500. ClickMechanic

  Source: Parkers: BMW 3 Series (2012-2019) used review

• Misfires (N43 petrol, 320i)

  Cars registered 2005–2011 · 2.0 petrol

  The 2.0 petrol can misfire from faulty injectors and coil packs.

  At the viewing: Check for a rough idle or warning light.

  Source: Fast Car: BMW 3 Series E90 buying guide

• Oil leaks (six-cylinder petrol)

  Cars registered 2005–2011 · Six-cylinder petrol

  The six-cylinder petrols leak oil from the cam cover and the oil filter housing.

  At the viewing: Look under the bonnet and the car for oil.

  Source: Fast Car: BMW 3 Series E90 buying guide

• Flat battery from the fuel filter heater (diesel)

  Cars registered 2005–2011 · Diesel

  A faulty fuel filter heater can drain the battery.

  At the viewing: Ask whether it has had flat batteries.

  Source: Haynes: BMW 3 Series Mk5 common problems (2004-2011)

• Clutch and dual-mass flywheel

  Cars registered 2005–2011 · Manual gearbox

  A faulty dual-mass flywheel can make the clutch seize. Both need replacing.

  At the viewing: Feel for judder or a heavy, odd clutch, and listen for rattles at idle.

  Source: Haynes: BMW 3 Series Mk5 common problems (2004-2011)

• Noisy differential

  Cars registered 2012–2019

  A whine from the rear as the car passes you can mean the differential has been neglected.

  At the viewing: Ask someone to drive it past you slowly and listen for a whine from the back.

  Source: Parkers: BMW 3 Series (2012-2019) used review

Common BMW 3 Series MOT failures to check

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

• Flexible brake hoses

  up to 5.8× usual

  Stands out on cars registered in 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009.

  Rough price £50–£200 our estimate

  At the viewing: Look for cracked or bulging rubber hoses behind the wheels and in the engine bay.

• Shock absorbers

  up to 2.6× usual

  Stands out on cars registered in 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 and 2018.

  Rough price £200–£300 (pair, average rear to front) ClickMechanic

  At the viewing: Push down hard on each corner. It should bounce once and settle. Look for oil on the shock absorber body.

• Airbag warning light

  up to 3.8× usual

  Stands out on cars registered in 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005 and 2006.

  Rough price £10–£80 our estimate

  At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

• Steering rack inner joints

  up to 5.2× usual

  Stands out on cars registered in 1990, 1992, 1993, 1995, 1999, 2012, 2013 and 2014.

  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.

• Anti-roll bar link bushes

  up to 2.6× usual

  Stands out on cars registered in 1990, 1991, 1992, 1993, 1995, 1996, 1997 and 1998.

  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.

• Ball joint

  up to 2.3× usual

  Stands out on cars registered in 1994, 1995, 1996, 1997, 1998, 1999, 2000 and 2001.

  Rough price £60–£150 (one joint) ClickMechanic

  At the viewing: Listen for knocking over bumps and check the rubber boots behind the wheels aren't split.

BMW 3 Series MOT pass rate by year

Of the years since 2005 with plenty of MOT tests, the 2006 BMW 3 Series did best (67% passed first time, 11 points above all 2006 cars) and the 2020 did worst (86%, 1 point below all 2020 cars). Older cars fail more, so compare each year with all cars registered the same year.

Questions to ask the seller before buying a BMW 3 Series

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

1. Has the timing chain been checked or replaced, and have oil changes been on time?
2. Has all the recall work been done?
3. Have the battery cable and blower recalls been done?
4. Has the timing chain been replaced?
5. Have the injectors or coils been replaced?
6. Have any oil leaks been fixed?