About this model
The second-generation Mercedes A-Class (W169) was produced from 2004 to 2012 and represents Mercedes' attempt to enter the compact city hatchback segment. In BiH the W169 is a very common model, bought by drivers who want the Mercedes badge and feel of quality, but in a smaller and more economical package than the C-Class. The largest share of examples on our roads are the diesel versions, dominated by the A180 CDI with the 109 hp OM640 engine. The typical owner is a middle-aged city driver or older pensioner who needs a reliable daily car, and mileages are usually between 150,000 and 280,000 km. Although the A-Class is not considered the most reliable Mercedes (the W203 and W211 are more robust), with regular maintenance the OM640 can clock 300,000+ km without major work.
Engines and variants
In BiH this model is most commonly available with the following engines.
OM640 - A160 CDI (82 hp). The base diesel version, same engine as the A180 CDI but with lower turbo boost pressure and software-limited output. The least stressed variant of the engine, but because of its weaker power it more often runs "in kickdown", so it suffers from all the same EGR and DPF issues as the A180 CDI. Drivers pick it for lower excise tax and consumption, and parts availability is excellent since it shares components with the stronger variants.
OM640 - A180 CDI (109 hp). The best-selling diesel version in BiH, with a good balance of power and fuel consumption (5.0-5.5 l/100 km). The main suspect for timing chain stretch and oil dilution by fuel during DPF regenerations, especially with city driving. The typical buyer is a driver covering 15,000-25,000 km a year, mostly in town and on regional roads, and original and aftermarket parts are widely available through BiH suppliers.
OM640 - A200 CDI (140 hp). The strongest diesel version, same block but with a larger turbo and stronger injectors. The highest thermal load on the engine, the turbo internals (VNT mechanism) fail earlier, around 180,000 km, and the Delphi injectors have a shorter life. Picked by drivers looking for more dynamics, but bear in mind that major turbo or injector work is a serious expense, and this version should not be bought without a full service history.
Reliability and reputation on the BH market
In BiH conditions the A-Class W169 ages decently if the owner keeps up with servicing. We typically see two groups of examples in our workshop: those with a complete service history that run past 250,000 km without serious faults, and those that have passed through several owners, nobody changed the oil on time, and now at 180,000 km they have a stretched chain, clogged DPF and worn Autotronic. Spare parts are available, original through Mercedes authorised dealers, and quality alternatives (Febi, Bosch, Lemförder) through regular suppliers. Parts prices are a little higher than on a Golf or Astra, but still acceptable. Compared to direct rivals like the BMW 1 Series F20 or Audi A3 8P, the W169 is cheaper to maintain on everyday parts (filters, oil, brakes), but more expensive for major work (CVT, timing chain). The right owner for a W169 is someone who likes the Mercedes brand, drives moderately, and understands that "lifetime" in the manual means "until the warranty runs out".
Common faults we see
From everyday practice, here is what most often comes in for repair on this model.
1. Stretched timing chain on the OM640
Symptom: Rattling on cold start (first few seconds), uneven idle, check engine light with camshaft/crankshaft correlation codes (e.g. P0016).
The OM640 engine (1.8 CDI with an aluminium block) on examples with neglected oil change intervals has a well-known problem with timing chain stretch, especially on earlier model years (2004-2008). The chain sits on the transmission side, so replacement is not easy and often requires dropping the engine or gearbox due to tight access.
Advice: If you hear metallic rattling for a second or two on cold start before oil pressure builds up, come in for diagnostics straight away. If the chain breaks, valves bend and the repair is no longer worth it on a car with over 200,000 km.
2. EGR valve and intake manifold
Symptom: Loss of power, smoke from the exhaust, uneven idle, check engine light, increased fuel consumption.
Like most diesels from that era, the OM640 has an EGR valve that gets caked up with soot mixed with oil vapour from the crankcase. On cars driven exclusively in town around Banja Luka, the problem appears as early as 120,000-150,000 km. The intake manifold clogs up at the same time, so the engine "chokes" on acceleration.
Advice: Mechanical cleaning of the EGR and intake manifold is routine work in our shop. If the EGR is completely seized or the flaps inside the manifold have broken, it goes new. Don't settle for "coder solutions" without cleaning.
3. Clogged DPF filter
Symptom: DPF/check engine light, going into "limp mode", increased fuel consumption, frequent regenerations, rising oil level due to fuel dropping into the crankcase during failed regenerations.
The DPF has been standard from 2005 onwards. Short city trips prevent regeneration, so the filter clogs up. On the A180 CDI there is an additional issue: during regeneration the engine injects extra fuel, some of which slips past the piston rings into the crankcase and dilutes the oil.
Advice: We check the oil level at every service. If it is above MAX, it is most likely diluted with fuel and must be replaced immediately. Forced regeneration via diagnostics solves 80% of cases as long as the filter is not physically destroyed.
4. Autotronic CVT gearbox (722.8)
Symptom: Jerking when pulling away, lost "punch" on acceleration, gearbox warning light, limp mode with a fixed gear, gearbox ECU faults.
The A180 CDI was often sold with the Autotronic CVT gearbox (722.8). The gearbox is sensitive to neglected maintenance, especially the oil that Mercedes lists as "lifetime", but which in reality must be changed. The control unit (TCM) fails, or the variator pulleys themselves, if it has been driven on old, burnt oil.
Advice: If you are buying a W169 with the CVT, always ask for proof that the gearbox oil has been changed in the last 60,000 km. Our recommendation is to change it every 50,000-60,000 km, depending on driving style. "Lifetime" doesn't exist in BiH conditions.
5. Oil leaks from seals and the oil cooler
Symptom: Smell of oil in the cabin, dripping under the engine, oil on the alternator and pulleys, low oil level between services.
The OM640 has a well-known leak through the valve cover gasket and, on older examples, through the oil cooler on the engine block. Oil often drips downward onto the exhaust manifold, and the smell of burnt oil is a typical warning sign.
Advice: Replacing the valve cover gasket is a half-day job. The oil cooler is more complicated and sometimes requires removing the intake manifold. Don't put off the repair, because oil leaking onto the exhaust manifold can cause a fire.
6. Tandem pump (vacuum + low-pressure fuel pump)
Symptom: Weak vacuum (stiff brake pedal), engine won't start, loss of power, visible oil leak behind the valve cover in the upper part of the engine.
The tandem pump on the OM640 combines the vacuum pump and the low-pressure fuel pump in a single unit, driven by the camshaft. The diaphragm fails, or oil leaks between the pump and the cylinder head. It typically appears between 150,000 and 200,000 km, depending on driving style and oil intervals.
Advice: If you notice the brake going "hard" after the first press, or the engine struggling to start after sitting overnight, the tandem pump is the first suspect. Parts are available and replacement is routine for us.
7. Coolant pump and thermostat leaks
Symptom: Low coolant level, patches under the engine, occasional overheating, radiator fan running constantly.
The plastic thermostat housing on the OM640 is prone to cracking after 8-10 years, and the water pump fails between 150,000 and 200,000 km. They are often replaced together because the assembly comes apart significantly.
Advice: During any timing chain replacement or major engine work, we advise preventive replacement of the water pump and thermostat as well. Otherwise you'd pay for the same labour twice.
8. Sensors and electrics (ABS, ESP, coded key)
Symptom: ABS/ESP light permanently on, voltage drops, occasional failure to recognise the key, battery drains overnight.
The W169 has a lot of electronics for a compact car of its time: SAM module (signal acquisition module), CAN-bus communication, wheel speed sensors. Cold BiH winters speed up failures on connectors and earth points. Battery drain due to "parasitic draw" (most often SAM or comfort module) is recorded in ADAC statistics as the most frequent intervention.
Advice: For phantom faults on the W169 you need serious diagnostics, not a basic OBD reader. Our STAR Diagnosis reads the complete module network. Don't forget to check the earth points under the driver's seat as well.
Service and maintenance
The OM640 has a timing CHAIN, not a belt, which means there is no fixed replacement interval, but it must be checked at every major service and replaced if there is audible rattling on start-up. Mercedes specifies longlife oil with intervals of up to 25,000 km, which is too long in BiH conditions. We advise changing MB 229.51 (5W-30) oil every 10,000-12,000 km or once a year, whichever comes first. Fuel filters should be changed every 30,000-40,000 km, depending on fuel quality, and preventive EGR cleaning should be planned every 60,000-80,000 km, depending on driving style (city driving requires shorter intervals). If the vehicle has the Autotronic CVT gearbox, change the gearbox oil every 50,000-60,000 km despite the "lifetime" label. Cost depends on the actual condition, get in touch for an estimate.
Which oil for the A180 CDI OM640
Use only oil with MB approval 229.51, viscosity 5W-30. That is a low-SAPS specification intended for diesels with a DPF, a low-ash oil that does not clog the soot filter. Cheap "universal" oils without MB approval shorten DPF life and can cause damage far greater than what you saved. In our workshop we use only oils that carry the explicit 229.51 approval on the label.
Owner tips
- Check the oil level every 2,000 km. If it is rising, the oil is being diluted with fuel during DPF regenerations and must be replaced immediately.
- Before buying a specific example: use the VIN to pull the full history of the car via carVertical. From international registers it usually shows the real odometer readings by date, recorded accidents, number of previous owners and theft or total loss indicators. We consider it mandatory before buying any used car, especially with German imports like the W169. When paying for the report you can use code GAGA for a 20% discount.
- Use only oil with MB approval 229.51 (5W-30), not cheap "universal" oils. The OM640 is sensitive to the specification.
- If the vehicle has Autotronic CVT, change the gearbox oil every 50,000-60,000 km regardless of what Mercedes calls "lifetime".
- Drive at least once a month on the motorway for 30 minutes or more so the DPF can complete a full regeneration. Short city trips will kill the filter in 2-3 years.
- Whenever you replace the battery, always code the new one via diagnostics. The W169 won't recognise a new battery without coding and you can get overnight drain issues.
Frequently asked questions
Is the Mercedes A180 CDI reliable for 250,000 km?
Yes, provided it has been regularly maintained. With proper oil intervals and preventive EGR cleaning, the OM640 engine easily passes 300,000 km. The main risks after 200,000 km are stretched timing chain, DPF and tandem pump, all repairable, but not cheap on a car that wasn't expensive to begin with. Check the service history before buying and don't pick up an example that "wakes up" with metallic rattling.
Which version of the A-Class W169 is the better choice, petrol or diesel?
For BiH roads we recommend the diesel - the A180 CDI is an excellent compromise of power and consumption. The petrol versions (A150, A170, A200) have balance shaft problems on some examples and higher city consumption. If you are looking exclusively at daily city driving up to 30 km, the petrol is fine, because the diesel won't have time to regenerate the DPF.
How long does the Autotronic CVT gearbox last on the W169?
With regular oil changes every 50,000-60,000 km the Autotronic can pass 250,000 km. With Mercedes' "lifetime" oil, the average is 150,000-180,000 km before the first serious fault. A full gearbox repair is not cost-effective on an older W169 because parts are expensive. If you are buying a used W169 with CVT, the manual is the safer choice.
Is it worth fitting LPG on the A180 CDI?
No, the A180 CDI is a diesel engine and is not suitable for LPG conversion. LPG is only fitted to petrol engines. If you have a petrol version (A150, A170, A200), an LPG install is possible, but because of the CVT gearbox and the small engine the return on investment is questionable - get in touch and we can look at your specific car.
What does cold-start rattling on the OM640 engine mean?
Most often it is a stretched timing chain "jumping" until oil pressure builds up. If the rattle lasts longer than 2-3 seconds or appears regularly, go for diagnostics immediately. The chain must be replaced before it breaks, otherwise valves bend and the repair is no longer cost-effective.
Is the W169 a good first car for young drivers?
The W169 is a good city car but not a good first car for an inexperienced driver. The electronics are complex, repairs are more expensive than on a Golf or Astra, and used examples in our price bracket are often neglected. For a first car we recommend something simpler (Polo, Fabia, Corsa). The W169 comes as a second or third car, when the driver knows what they are buying.
If you notice any of these symptoms on your W169, drop by the workshop. Better to check early than to pay for a costly repair later.