The Mercedes-Benz B-Class W245 occupies a unique niche in the compact MPV segment. Launched in 2005 as a direct successor to the A-Class-based concept, it combined the practicality of a tall hatchback with the brand prestige of the three-pointed star. For buyers looking for a spacious, fuel-efficient daily driver with a premium feel, the T245 was a compelling option — and it remains so on the used market today.
Whether you are a first-time Mercedes owner, a growing family, or a DIY mechanic searching for an affordable entry point into the brand, the B-Class T245 deserves serious consideration. However, like any used vehicle in this price range, it comes with specific reliability patterns you need to understand before handing over your money.
This guide covers everything: engine reliability, known failure points, maintenance costs, and the best versions to look for — so you can buy with confidence and avoid costly surprises.
Parts & Accessories
Your Mercedes-Benz B Class T245 deserves better.
Hand-picked performance and replacement parts — ready to ship.
Shop Mercedes-Benz parts →History and Versions
The Mercedes-Benz B-Class T245 was produced from 2005 to 2011, representing the first generation of the standalone B-Class nameplate. Built on the same sandwich-floor platform as the W169 A-Class, it offered significantly more interior space without a dramatic increase in exterior footprint.
The T245 was available with a range of petrol and diesel engines, from the modest B150 to the performance-oriented B200 Turbo. A facelift arrived in 2008, bringing revised front styling, updated interior trim, and minor mechanical improvements. The model was replaced by the W246 in 2011.
| Engine | Displacement | Power | Torque | 0-60 mph | Notes |
|---|---|---|---|---|---|
| B150 (M266) | 1.5L I4 | 95 hp | 140 Nm | ~12.0 s | Entry-level petrol, naturally aspirated |
| B170 (M266) | 1.7L I4 | 116 hp | 155 Nm | ~10.2 s | Most common petrol variant |
| B200 (M266) | 2.0L I4 | 136 hp | 185 Nm | ~8.9 s | Strong naturally aspirated option |
| B200 Turbo (M266) | 2.0L I4 Turbo | 193 hp | 280 Nm | ~7.0 s | Sportiest variant, CVT or manual |
| B180 CDI (OM640) | 2.0L I4 Diesel | 109 hp | 250 Nm | ~10.5 s | Efficient entry diesel |
| B200 CDI (OM640) | 2.0L I4 Diesel | 140 hp | 300 Nm | ~9.2 s | Best diesel balance of power/economy |
How to Check a Used Mercedes-Benz B-Class T245's History
Before buying a used Mercedes-Benz B-Class T245, it is essential to ensure full transparency about its past. Undisclosed accidents can hide poor-quality repairs that directly compromise the safety of the driver and passengers.
On the T245 specifically, risks that are invisible to the naked eye include misaligned sandwich-floor body panels following a frontal or underside impact, unreplaced airbag modules after a deployment event, and hastily repaired front subframe components that can affect steering geometry and handling stability. Given the T245's age — most examples are now 15 to 20 years old — flood damage and odometer fraud are also real concerns on this generation. It is therefore strongly recommended to check the vehicle's complete history using its license plate or VIN number before making any purchase decision.
Get an instant 20% discount to access a vehicle's full past with total transparency via carVertical by clicking this link or on the banner below:
Key Strengths
The T245 B-Class has several qualities that make it a genuinely attractive used buy. Its sandwich-floor construction creates an unusually spacious cabin for its footprint, offering generous headroom and a flat, versatile floor that competing hatchbacks cannot match.
The diesel variants — particularly the B200 CDI — are renowned for real-world fuel economy, regularly achieving over 45 mpg in mixed driving. These engines are well-matched to the vehicle's weight and character.
Build quality, while not class-leading, is solid for the era. Interior materials hold up well with age, and the driving experience remains composed and refined. Parts availability is strong, and because this model shares components with the W169 A-Class, maintenance costs are kept reasonable. The T245 also has a loyal owner community in the US and Europe, making technical support and used parts easy to find.
Known Reliability Issues
B150 / B170 / B200 — M266 Naturally Aspirated
CVT transmission wear The Continuously Variable Transmission (CVT) paired with several petrol variants is the single biggest reliability concern on the T245. Fluid degradation leads to belt and pulley wear, causing juddering during acceleration or a loss of drive. This typically appears between 80,000 and 120,000 miles. Severity: Critical. Always confirm whether the CVT fluid has been changed at regular intervals.
Balance shaft and timing chain tensioner failure The M266 engine is known for balance shaft module issues. The balance shaft sprocket can strip or crack, causing a rattling noise at startup. If left unaddressed, this leads to catastrophic engine damage. Symptoms typically appear from 60,000 miles onward. Severity: Critical.
Oil leaks from camshaft cover and rear crankshaft seal Both the camshaft cover gasket and rear crankshaft seal are prone to weeping oil as the engine ages. These are moderate-severity issues that become more common after 70,000 miles and should be addressed promptly to avoid contamination of other components. Severity: Moderate.
Throttle body carbon buildup Carbon deposits accumulate on the throttle body and intake valves on higher-mileage naturally aspirated units, causing rough idling and hesitation under light throttle. Typically noticeable after 80,000 miles. Severity: Minor to Moderate.
B200 Turbo — M266 Turbocharged
Turbocharger failure and oil feed issues The B200 Turbo variant adds stress to the M266's already critical balance shaft and timing components. The turbocharger itself can fail due to oil feed pipe blockage, especially if oil changes were not performed on schedule. Failure typically occurs between 70,000 and 100,000 miles. Severity: Critical.
Intercooler pipe splits The intercooler hoses and silicone joints on the B200 Turbo are prone to cracking with age and heat cycling, leading to boost leaks and significant power loss. This is a relatively inexpensive fix but is easy to overlook during a pre-purchase inspection. Typical mileage: 60,000 miles and above. Severity: Moderate.
CVT overheating under load The CVT on the turbocharged variant is under considerably more stress. Aggressive driving or towing accelerates wear dramatically. Fluid replacement every 40,000 miles is non-negotiable on this variant. Severity: Critical if neglected.
B180 CDI / B200 CDI — OM640
Injector wear and return pipe leaks The OM640 diesel engine can develop fuel injector return pipe leaks, causing hard starting, white smoke on startup, and reduced performance. This is one of the more common issues on high-mileage diesel T245s, typically appearing after 90,000 miles. Severity: Moderate.
EGR valve clogging Like most diesel engines of this era, the EGR valve accumulates soot deposits over time. Symptoms include rough idling, increased fuel consumption, and occasional limp mode. Most common after 70,000 miles of urban or stop-and-go driving. Severity: Moderate.
Diesel particulate filter (DPF) blockage Cars used predominantly for short trips will suffer premature DPF clogging. Forced regeneration cycles or professional cleaning are required when the warning light appears. Severity: Moderate. Mileage varies widely depending on use.
Chassis Issues
Front control arm bushings The front lower control arm bushings wear relatively quickly on the T245, producing clunking noises over bumps and vague steering. Expect to replace them between 60,000 and 80,000 miles. This is a straightforward DIY job but should not be deferred.
Rear trailing arm bushings The rear suspension bushings are another wear item on this platform, shared with the Mercedes-Benz A-Class W169. Degradation leads to a floaty, unstable rear end, particularly noticeable at highway speeds.
Electronics and Software
COMAND/radio module failures The infotainment unit is prone to software glitches and occasional screen failure, particularly on higher-mileage examples. These are rarely critical but can be expensive to replace with OEM units.
Instrument cluster pixel loss A known issue across multiple Mercedes models of this era: individual LCD pixels fail in the instrument cluster, making portions of the display illegible. Severity: Minor but annoying.
Glow plug failure (diesel variants) Failed glow plugs on OM640-equipped cars cause difficult cold starts. They should be inspected and replaced preventively around 80,000 miles.
Rust
Rust is a significant issue on the Mercedes-Benz W245, especially given the age of most surviving examples. Unlike later models, corrosion protection on this generation is only متوسط, meaning rust often develops progressively once the protective paint layer is compromised.
The most common areas are the rear wheel arches, door bottoms, and the tailgate lower edge. These spots trap moisture and road salt, leading to bubbling paint that usually indicates deeper corrosion underneath.
On higher-mileage or poorly maintained cars, rust can extend beyond cosmetic panels and affect structural areas such as suspension mounting points or subframes. At that stage, repairs become expensive and may exceed the value of the vehicle.
For buyers, rust should be treated as a key inspection point rather than a minor defect. A clean, rust-free W245 is increasingly rare and significantly more desirable on the used market.
Maintenance and Servicing
The T245 B-Class follows a relatively straightforward service schedule. Mercedes specifies a ASSYST service interval system, but in practice, annual oil changes are strongly recommended given the age of these vehicles.
Key service intervals:
- Engine oil and filter: Every 10,000 miles or annually — use 5W-30 or 5W-40 fully synthetic as specified
- Spark plugs (petrol): Every 30,000 to 40,000 miles
- Air filter: Every 20,000 to 30,000 miles
- CVT fluid: Every 40,000 miles — critical for longevity
- Brake fluid: Every 2 years regardless of mileage
- Timing chain: Inspect from 60,000 miles on M266 engines; no set replacement interval but monitor for rattle
Average service costs for a B-Class T245 in the US market range from $150 to $300 for a standard oil service at an independent specialist. CVT fluid changes run $200 to $350. Timing chain and balance shaft repairs are the most expensive job, potentially reaching $1,500 to $2,500 depending on labor rates.
Parts to Watch / Replace First
Balance shaft module — The most critical component on M266 petrol engines. Inspect for wear or damage at purchase; budget for replacement if the car has no documented history of this repair.
CVT transmission fluid — Not a part per se, but fresh fluid is the single best investment on any T245 with a CVT. Degraded fluid accelerates belt and pulley wear irreversibly.
Front lower control arm bushings — High-wear item shared with the W169 A-Class platform. Replace proactively if the car pulls or clunks over bumps.
Timing chain tensioner — The plastic guides and tensioner on the M266 are age-sensitive. Replace as a preventive measure on any car over 80,000 miles without documented chain work.
EGR valve (diesel) — A clean or replacement EGR valve restores smooth idling and protects the intake manifold from long-term soot accumulation.
Intercooler hoses (B200 Turbo) — Inspect all joints and silicone connectors. Cracked hoses cause significant power loss and are cheap to replace.
Glow plugs (diesel) — Replace all four as a set if cold-start issues are present or if mileage exceeds 80,000 miles.
Rear trailing arm bushings — Often overlooked during inspections; worn bushings compromise handling safety and should be among the first chassis items evaluated.
FAQ
Is the Mercedes-Benz B-Class T245 reliable?
The T245 is moderately reliable for a compact MPV of its era. Diesel variants are generally more dependable than petrol units, especially when well-maintained. The main weak points — the M266 balance shaft and the CVT transmission — are well-documented, and avoiding cars with poor service history significantly reduces risk.
What is the best engine option in the T245?
The B200 CDI (OM640 diesel) is widely considered the best all-round choice. It delivers strong torque, excellent fuel economy, and is better matched to the vehicle's character than the turbocharged petrol. If you prefer petrol, the naturally aspirated B200 offers a good balance without the added complexity of the turbo system.
How many miles will a Mercedes-Benz B-Class T245 last?
A well-maintained T245 can realistically reach 150,000 to 200,000 miles. Diesel examples with regular servicing frequently surpass this. The critical factor is CVT fluid maintenance on petrol variants and timing chain attention on all M266 engines.
Is the Mercedes-Benz B-Class T245 expensive to maintain?
Compared to larger Mercedes models, the T245 is relatively affordable to maintain. Routine services cost between $150 and $300 at independent specialists. The most expensive potential repair is the balance shaft / timing chain job on the M266, which can reach $2,500. CVT rebuilds or replacements are similarly costly, reinforcing the importance of fluid maintenance.
Which T245 variants should I avoid?
Avoid any B200 Turbo with an undocumented CVT service history or signs of aggressive use. Early M266-engined petrol cars without evidence of balance shaft inspection or replacement at higher mileage also carry elevated risk. Any T245 — petrol or diesel — with signs of short-trip urban use is best approached with caution due to accelerated wear on the CVT, DPF, and EGR systems.
Does the T245 share parts with the A-Class W169?
Yes. The T245 shares its platform and many components — including suspension parts, brakes, and some electrical modules — with the W169 A-Class. This makes parts sourcing more straightforward and generally keeps repair costs lower than on larger Mercedes models.
Conclusion
The Mercedes-Benz B-Class T245 earns a reliability score of 6.5/10. It is a practical, well-built compact MPV with real strengths in space efficiency and diesel economy, but it carries notable weak points around the M266 balance shaft, CVT transmission, and age-related wear items. Buy a well-documented, service-history-rich example — preferably the B200 CDI — and this car can offer years of dependable, affordable ownership. Browse our parts catalog to find everything you need to keep your T245 running at its best.