BMW 520d E60

The N47 engine (fitted from September 2007) has a well-documented timing chain design flaw. The chain, tensioner, and guides are located at the rear of the engine against the gearbox, making replacement extremely labor-intensive. Early N47 engines built between March 2007 and January 2009 are most severely affected due to a manufacturing fault on the crankshaft sprocket. BMW partially addressed this with revised components from mid-2009, but failures continued on later cars. Symptoms start with a metallic rattle from the rear of the engine on cold start, lasting a few seconds to over 30 seconds. If ignored, the chain can skip or snap, causing pistons to strike valves and destroying the engine. Independent specialists typically charge €2,000-3,500 for chain, guides, and tensioner replacement; if the crankshaft sprocket or bearings are also damaged, costs can reach €4,000-6,000. A full engine replacement at a BMW dealer has been quoted at €8,000-12,000. This issue does not affect the M47 engine (pre-September 2007 models). Preventive replacement is recommended at 100,000-120,000 km on N47 engines that have not already been serviced.

The M47TU2D20 engine (pre-September 2007 models) uses swirl flaps in the intake manifold that are known to deteriorate over time. The flap spindles can wear, causing the flaps to break loose and be sucked into the cylinders, resulting in scored cylinder walls, damaged pistons, and in worst cases a destroyed engine. If caught before engine ingestion, preventive removal and blanking costs around €200-500 at an independent specialist. If engine damage has occurred, repairs range from €2,500-4,000 or more depending on severity. Many owners proactively delete the swirl flaps using billet aluminum blanking plates with no significant performance loss. This is one of the first things to check on any M47-powered E60. This issue does not affect the N47 engine.

Both the M47 and N47 engines are fitted with a diesel particulate filter that requires periodic regeneration through extended highway driving. Short urban trips prevent the exhaust from reaching the temperatures needed for automatic regeneration. A common compounding factor is a stuck thermostat (a known E60 weak point), which prevents the coolant from reaching the temperature threshold that triggers DPF regeneration. Symptoms include the DPF warning light, reduced power, and increased fuel consumption. Professional DPF cleaning costs €300-500. A new aftermarket DPF costs approximately €800-1,200 fitted, while an OEM unit from BMW can cost €1,500-1,800. Replacing the thermostat (€200-400) often resolves repeated regeneration failures.

Carbon deposits from exhaust gases gradually clog the EGR valve and cooler, particularly on cars used predominantly for short trips or city driving. Symptoms include rough idle, reduced power, increased smoke, and error codes. BMW issued a recall for EGR cooler replacement on certain diesel models due to a risk of internal coolant leaks that could cause intake manifold melting and potentially fire. Cleaning the EGR valve costs around €150-250 at an independent shop. Full replacement of the EGR valve is approximately €300-500. If the EGR cooler is also affected, total costs rise to €500-800. Verify with BMW whether the EGR cooler recall applies to the specific VIN.

The E60 was one of the first BMW models to feature the iDrive system, controlled by the CCC (Car Communications Computer) module located in the trunk. This unit is prone to failure from heat cycling and capacitor degradation, causing symptoms such as screen going blank, system rebooting in loops, navigation freezing, or complete loss of audio and climate controls. Water ingress through deteriorating trunk seals can also damage the CCC and surrounding electronics. Specialist CCC repair services in Europe charge around €200-400 for refurbishment and return. A refurbished replacement unit costs approximately €400-600 fitted. BMW dealer replacement with coding runs €800-1,000. Check trunk for signs of moisture and test all iDrive functions thoroughly during any pre-purchase inspection.

Both the M47 and N47 turbochargers can fail, though this is less common than timing chain or DPF issues. The most frequent cause is oil starvation from blocked oil feed pipes or extended service intervals. Symptoms include excessive smoke, loss of power, whining noises, and oil in the intercooler piping. A remanufactured turbo fitted by an independent specialist costs approximately €1,500-2,000. A new genuine turbo from BMW costs €2,000-2,500 fitted. Always check turbo shaft play and listen for unusual whining during test drives. Oil should be changed every 10,000 km or annually, not at BMW's extended 25,000 km interval.

The wiring harness that passes through the rubber grommet at the trunk lid hinge is subjected to constant bending every time the boot is opened. Over time, the wires fracture inside their insulation, causing intermittent or permanent failure of tail lights, license plate lights, trunk release, and rear parking sensors. This is extremely common on E60 models over 10 years old. BMW offers a repair wiring set (part number 61119118817). An independent mechanic can splice and repair the broken wires for €150-250. A full harness replacement at BMW costs €400-600. This is almost guaranteed to need attention at some point during ownership.

Manual-gearbox E60 520d models use a dual mass flywheel that wears over time, producing a distinctive rattling noise at idle, during engine startup, and especially at shutdown. This is a wear item but failure timing varies widely from 80,000 to 200,000 km depending on driving style. City driving with frequent clutch engagement accelerates wear. Replacement is typically done together with the clutch, as labor overlap makes this economical. A clutch and DMF kit from LuK or Sachs costs approximately €400-600 for parts, with labor of €600-800 at an independent shop. Total cost ranges from €1,200 to €2,000 depending on parts quality and workshop. This only applies to manual gearbox cars; automatic transmission models are not affected.

The E60 front suspension uses hydraulic thrust arm bushings that degrade with age and mileage, typically becoming noticeable between 80,000 and 120,000 km. Symptoms include a vague, imprecise feeling in the steering, clunking or knocking sounds over speed bumps, and uneven tire wear. BMW recommends that once the bushing is replaced a second time, the entire control arm should be replaced instead. Replacement of both thrust arm bushings costs approximately €300-500 at an independent shop with quality aftermarket parts. Using OEM BMW parts and a dealer, costs reach €500-700. This is a common MOT failure point in countries with annual vehicle inspections.