The compact diesel that defined BMW's entry-level range for nearly a decade, rear-wheel drive with a 118d xDrive offered from July 2013. The 118d pairs strong fuel economy with engaging driving dynamics, making it a popular commuter and company car across Europe. The critical question is which engine sits under the hood: pre-2015 cars use the N47 with its well-documented timing chain concerns, while 2015+ LCI models received the significantly improved B47.· more· less
N47 timing chain risk (pre-2015)DPF clogs on short urban trips
Buy if: You do regular motorway driving and can find a 2015+ B47 model with full service history, or a well-maintained N47 with a recently replaced timing chain.
Avoid if: You primarily drive short urban trips (DPF will clog) or are considering a high-mileage pre-2015 N47 model without evidence of timing chain work.
Price & maintenance
Used price
€10,000
median asking price, typically 165,000 km
Typical range€7,800 – €13,400
Kilometres drivenAll
Maintenance cost
€900 – €1,700/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€500 – €850 /yr
Risk bufferunplanned repairs€400 – €850 /yr
Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Used price
€10,000
Typically €7,800 – €13,400, at around 165,000 km.
Kilometres driven
Maintenance
€900 – €1,700per year
€500 – €850
service, tyres, brakes
€400 – €850
repair buffer
Price & maintenance
Used price
€11,500
median asking price, typically 175,000 km
Typical range€8,900 – €14,000
Kilometres drivenAll
Maintenance cost
€900 – €1,700/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€500 – €850 /yr
Risk bufferunplanned repairs€400 – €850 /yr
Price estimates are based on French asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on French asking prices. Prices and costs vary by vehicle condition and location.
Timing chain at rear of engine stretches, causes rattle on cold start; if it snaps, engine is destroyed · more· less
The N47 diesel engine positions its timing chain at the rear, between the engine and gearbox. The original chain, guides, and tensioner were prone to premature wear, with the chain stretching over time. A distinctive rattling noise on cold start (lasting 1-30 seconds) is the early warning sign. Specialists report doing 4-5 N47 chain replacements per week, indicating how widespread this is. BMW revised the chain components in 2009 and again in 2011, significantly reducing failure rates on later N47 engines. If caught early, replacement costs €1,200-1,800 at an independent specialist (transmission must be removed for access). If the chain snaps, it causes catastrophic valve-piston contact requiring engine replacement at €3,500-6,500. Post-2015 LCI models with the B47 engine keep the chain on the transmission side but use revised components, and this issue is largely resolved.
EGR cooler leak and fire risk
up to €1,5002 of 8
EGR cooler can leak coolant internally, mixing with soot and potentially causing intake manifold damage · more· less
BMW recalled approximately 800,000 diesel vehicles worldwide (N47, N57, and B47 engines) for EGR cooler issues. Coolant can leak inside the EGR cooler and combine with diesel soot at high temperatures, creating smouldering particles that may melt holes in the plastic intake manifold. In rare cases this has caused vehicle fires. BMW's recall involves inspection and replacement of the EGR cooler and intake manifold if necessary, free of charge. However, many owners report problems after the recall work, including power loss and new engine errors. If your car hasn't had the recall completed, verify with BMW using the VIN immediately. Outside of recall coverage, EGR valve replacement costs €300-600 at an independent, with intake manifold replacement adding €400-900.
DPF clogging from short trips
up to €2,0003 of 8
Diesel particulate filter blocks if car is driven primarily on short urban journeys · more· less
The DPF requires regular highway driving at sustained speeds above 60 km/h to perform passive regeneration. Cars used primarily for short urban trips accumulate soot faster than the filter can burn it off. Active regeneration (triggered by the ECU) also requires the engine to be at full operating temperature with sufficient fuel in the tank. Failed regenerations lead to a blocked DPF, causing power loss, increased fuel consumption, and warning lights. Professional DPF cleaning costs €200-350. If the DPF is filled with ash rather than soot, it must be physically removed and back-flushed (€400-600) or replaced entirely (€1,200-2,000). This is not a defect but a design characteristic of all diesel engines with particulate filters.
Swirl flap failure in intake manifold (N47)
up to €1,2004 of 8
Swirl flap actuator rod or bushes can break, potentially dropping debris into the engine · more· less
The N47 engine has swirl flaps inside the intake manifold that are controlled by an actuator rod. The rod and its bushes wear over time, and in the worst case can break and drop metal fragments into the engine. Unlike the older M47 engine where the shaft was external, the N47's shaft runs inside the manifold, making repair more complex. Symptoms include uneven idle, smoke on startup, and misfires. Many owners preventively delete the swirl flaps using blank plug kits (€15-20 for the kit). Full intake manifold replacement costs €600-1,200 including parts and labor. This issue primarily affects the N47 engine; the B47 has improved swirl flap design.
Turbo actuator sticking or failure
up to €2,5005 of 8
Electronic turbo actuator sticks from carbon buildup, causing limp mode and power loss · more· less
BMW specifies a variable-geometry turbocharger for both the original and facelift 118d, and its electronically controlled vane mechanism can stick due to carbon buildup, particularly on cars that are driven gently or only on short trips. Symptoms include EPC warning light, limp mode, and significant power loss. BMW does not sell the actuator separately from the turbocharger, so dealer quotes typically include full turbo replacement at €1,500-2,500. However, specialist actuator repair services can rebuild the actuator for €400-600, saving up to 80% compared to dealer replacement. Regular spirited driving and highway use helps prevent carbon buildup on the actuator.
Steering rack knocking
up to €1,8006 of 8
Electric power steering rack develops play, producing a knocking noise over bumps and during parking · more· less
The F20's electric power steering rack commonly develops internal play between the gear components and the EPS motor, producing an audible knocking sound at low speeds, over speed bumps, and during parking manoeuvres. You can test this by turning the steering wheel side to side with the engine off. Some BMW specialists offer an adjustment fix using a special tool on the thrust piece bolt for around €100-150, but the noise typically returns after a few thousand kilometres. Full steering rack replacement costs €1,200-1,800 at a dealer. This is a common characteristic across the F20 and F30 platform.
Clutch and dual mass flywheel wear (manual)
up to €1,5007 of 8
Clutch judder from cold and DMF vibration typically appear between 80,000-130,000 km · more· less
Manual-equipped 118d models are known for mild clutch judder when moving off, especially on inclines and when the car is cold. This has been reported since new on many F20 diesels and is a known characteristic. Over time, the dual mass flywheel wears and develops excessive play, producing vibration felt through the pedal and drivetrain. Combined clutch and DMF replacement costs €900-1,500 at an independent specialist, with parts (flywheel €275-400, clutch kit €150-250) and approximately 3.5 hours labor. This typically becomes necessary between 80,000-130,000 km depending on driving style.
Boot water ingress
up to €3008 of 8
Water enters the boot through rear light area or damaged vents, risking battery and electrical damage · more· less
Water ingress into the boot is a known F20 issue, with water accumulating in the storage compartments near the battery. The root cause is often the rear vent or taillight area, as BMW reportedly does not use seals on the rear lights of this model. Prolonged water exposure can damage the 12V battery and electrical components in the boot area. Self-adhesive draught excluder tape or silicone sealant around the affected areas costs minimal amounts for a DIY fix. Professional repair of water-damaged electrical components can reach €200-300.
Engine generation is the key differentiator
The 118d F20's reliability depends heavily on which engine it has. Pre-2015 N47 models carry the well-documented timing chain risk and need careful inspection before purchase. Post-2015 B47 models are significantly more reliable, though the chain stays on the transmission side rather than moving to the front. Both versions share diesel-specific concerns around DPF health and EGR reliability. With proper maintenance and regular highway driving, the 118d can deliver reliable high-mileage service.
Service history
Complete BMW dealer or specialist records essential. Verify oil change intervals — more frequent changes (every 10,000 km rather than BMW's longer interval) significantly reduce engine wear.
Tires
Check tread depth, age (date codes on sidewall), and uneven wear patterns. Rear tires wear faster on RWD cars.
Cold start
Must start engine completely cold. Listen carefully for rattling noise in the first 30 seconds — this is the single most important check on N47 engines.
Test drive
Minimum 30 minutes including highway speeds to allow DPF regeneration cycle and expose any gearbox or turbo issues that only appear when hot.
Specific for this vehicle
Identify the engine: N47 or B47
Check the build date on the door pillar sticker. Pre-March 2015 production = N47. Post-March 2015 = B47. The B47 has significantly fewer issues. Alternatively, check the engine code on the engine plate.
Cold start timing chain rattle (N47 only)
Start engine completely cold and listen for metallic rattling from the rear of the engine for 1-30 seconds. Any rattle indicates chain stretch. Walk away or negotiate a significant price reduction for chain replacement.
Verify EGR cooler recall completed
Contact BMW with the VIN. This is a fire safety recall affecting N47 and B47 diesels. Must be completed regardless of engine type.
+ 5 more checksShow less
Check DPF health and driving pattern
Ask about typical journeys. Cars used mainly for short urban trips will have DPF issues. Check for DPF warning lights or excessive smoke. A diagnostic scan showing DPF soot level above 50% indicates problems.
Test steering for knocking noise
Turn the steering wheel side to side with the engine off. Drive over speed bumps at slow speed. Knocking indicates steering rack wear — common but fixable.
Inspect boot for water ingress
Lift the boot floor and check around the battery area for moisture, corrosion, or water stains. Check rear light sealing areas.
Check clutch judder (manual only)
On a manual car, drive from standstill on a slight incline. Judder when the clutch engages indicates worn clutch or dual mass flywheel.
Check coolant level and condition
Low coolant or murky appearance could indicate EGR cooler leak or head gasket issue. Check expansion tank for correct level.
Recalls and Technical Service Bulletins
EGR cooler leak / fire risk, expanded BMW campaign covering about 1.6 million vehicles produced August 2010 - August 2017; individual UK F20 campaigns have narrower build windowsCritical - verify completed with VIN
Crankshaft sensor firmware fault causing reduced power or stalling, campaign R/2018/211 (1 Series diesels built May - July 2018, includes 1S52-coded 118d)Critical - verify completed
Takata airbag inflator (VIN, trim and country dependent; BMW France lists F20/F21 M Sport cars 2011-2019 for Corsica and the overseas territories, BMW Ireland lists F20/F21 among potentially affected models)Verify by VIN and market
The EGR cooler recall is the most critical — it affects fire safety. Contact BMW with the VIN to verify all recalls have been completed. A driveshaft campaign and a fuel filter heater campaign are often listed for the 1 Series; both cover pre-F20 cars built in 2009 to 2011. Some owners report new issues after the EGR recall work, so check for any error codes or power loss after recall service.
Warranty Status
Factory warranty (2 years)Expired on all F20 models
3-year warranty (Nov 2016+ cars)Expired on all F20 models
Rust perforation warranty (12 years)May still apply for 2014+ cars
All BMW 118d F20 models are outside their original factory warranty. BMW's 12-year rust perforation warranty may still apply to later models. Extended warranty options are available through BMW dealers but typically exclude known wear items.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
