The Mercedes-Benz A-Class W177 A 35 AMG stands out in the luxury compact car segment, combining exhilarating performance with cutting-edge technology. As part of the AMG lineup, it delivers a thrilling driving experience without compromising the comfort and practicality expected of an A-Class model. However, like any high-performance vehicle, the A 35 AMG has challenges. Owners and prospective buyers should be aware of several common problems that may arise. This comprehensive guide delves into these issues, providing in-depth insights, causes, and potential solutions.
Mercedes-Benz A-Class W177 A 35 AMG Engine Performance Issues
The turbocharged 2.0-liter engine of the A 35 AMG is a marvel of engineering, delivering both power and refinement. However, its high-performance nature means it is more susceptible to specific issues.
Turbocharger Lag and Overheating
One of the most frequently reported issues is turbocharger lag. While turbo lag is a characteristic of turbocharged engines, excessive lag can be frustrating, especially in a performance-oriented car like the A 35 AMG. Turbo lag often occurs when the turbocharger takes time to spool up and deliver power. This delay can stem from inefficiencies in the turbo system or software calibration issues. Regular updates to the vehicle’s engine control software and inspections of the turbo system can help reduce lag and enhance throttle response.
Overheating the turbocharger is another common problem, particularly for drivers who frequently engage in spirited driving. The intense heat generated during high-performance use can strain the turbo system, potentially leading to reduced performance or long-term damage. Installing upgraded cooling components, such as a high-performance intercooler, and following cool-down procedures after aggressive driving can help protect the turbocharger.
Oil Consumption and Leaks
High oil consumption is a known concern for many A 35 AMG owners. This issue is often due to the high-performance demands on the engine, which can cause accelerated wear on components like piston rings and valve seals. Signs of excessive oil consumption include frequent top-ups and visible blue smoke from the exhaust. Routine maintenance, including regular oil level checks, is essential to address this issue. Severe cases may require replacing worn components to restore proper oil control.
Oil leaks, especially around the oil pan, turbocharger lines, or gaskets, are another issue reported by owners. Left unchecked, oil leaks can lead to reduced lubrication, overheating, and potential engine damage. Identifying and repairing leaks promptly is crucial to maintaining engine health.
Engine Misfires and Rough Idling
Issues in the ignition system often cause engine misfires and rough idling. Faulty spark plugs, ignition coils, or clogged fuel injectors are common culprits. Misfires can lead to uneven engine performance, reduced fuel efficiency, and increased emissions. Regularly replacing worn spark plugs and cleaning fuel injectors can help maintain smooth engine operation and prevent these problems.
Mercedes-Benz A-Class W177 A 35 AMG Transmission Problems
The 7-speed dual-clutch transmission (DCT) in the A 35 AMG is designed to deliver quick and seamless gear shifts, enhancing both performance and driving enjoyment. Despite its sophistication, the transmission system can experience certain issues.
Jerky Shifts at Low Speeds
A common complaint among A 35 AMG owners is jerky gear shifts, particularly at lower speeds or during stop-and-go traffic. This issue can detract from the smooth driving experience expected of a luxury vehicle. It is often caused by software glitches in the transmission control unit or wear in the clutch assembly. Updating the transmission software and inspecting the clutch system can resolve this issue.
Delayed Engagement
Delayed engagement when shifting from park to drive or reverse is another reported problem. This delay can create an unsettling experience, especially in tight or fast-paced driving situations. Low transmission fluid levels or hydraulic actuator malfunctions are often to blame. Ensuring proper transmission fluid levels and scheduling regular servicing can prevent or address these problems.
Overheating During Aggressive Driving
The A 35 AMG’s transmission is engineered for high-performance use but can overheat during prolonged spirited driving. Overheating can lead to reduced performance and potential damage to internal components. Installing an aftermarket transmission cooler or modifying driving habits, such as allowing the transmission to cool between aggressive driving sessions, can help mitigate this risk.
Mercedes-Benz A-Class W177 A 35 AMG Suspension and Steering Issues
The suspension and steering systems of the A 35 AMG are tuned for sporty handling and precise feedback. While these systems enhance the vehicle's driving dynamics, they are not immune to wear and tear.
Noisy Suspension
Noisy suspension components are a frequently reported issue. Drivers often hear clunking or knocking when navigating uneven roads or speed bumps. Worn-out bushings, strut mounts, or shock absorbers typically cause these noises. Addressing this issue involves inspecting the suspension system and replacing any worn components. Regular maintenance can help preserve the suspension’s integrity and ensure a smooth ride.
Steering Rack and Alignment Problems
Issues with the steering rack, such as stiffness or unusual noises during operation, have been reported by some A 35 AMG owners. These problems can result from wear and tear on the steering rack or insufficient power steering fluid. Timely inspections and replacements are necessary to maintain precise and responsive steering.
Suspension misalignment is another common issue, often identified by uneven tire wear or reduced handling performance. Regular wheel alignments are crucial to detecting and resolving alignment issues, ensuring optimal handling, and extending tire lifespan.
Brake System Challenges
The A 35 AMG features high-performance brakes designed to handle aggressive driving. However, these components can face challenges when used heavily.
Premature Brake Wear
Frequent complaints include premature wear of brake pads and discs, especially among drivers who push the vehicle to its limits. Spirited driving and the vehicle’s weight can accelerate brake wear. Opting for high-quality performance brake components and adopting smoother braking habits can help extend the life of the braking system.
Brake Squealing and Noise
Brake squealing or noise during application is another common issue. Glazed brake pads, worn rotors, or improper installation often cause this noise. While it may not always indicate a safety concern, it can be annoying. Cleaning the brake components or replacing them with high-quality parts typically resolves the issue.
Brake Warning Lights
Dashboard warning lights related to the braking system can appear due to low brake fluid levels, worn sensors, or actual malfunctions in the braking system. Ignoring these warnings can compromise braking performance and safety, and prompt diagnosis and resolution of these issues are essential to maintaining braking efficiency.
Mercedes-Benz A-Class W177 A 35 AMG Cooling System Issues
The cooling system of the Mercedes-Benz A-Class W177 A 35 AMG is integral to ensuring the engine operates at optimal temperatures, particularly during high-performance use. However, some owners have reported issues with the system that could lead to overheating and reduced reliability.
Coolant Leaks
Coolant leaks are among the most common cooling system problems A 35 AMG owners face. These leaks can occur in various areas, such as the radiator, hoses, or water pump. Symptoms of a coolant leak include visible puddles under the car, low coolant levels, or overheating. If left unresolved, these leaks can result in significant engine damage. Regular inspections and timely repairs, such as replacing worn hoses or failing radiators, are essential to maintaining the cooling system.
Thermostat Failures
The thermostat regulates the coolant flow, ensuring the engine maintains its ideal operating temperature. A malfunctioning thermostat can either get stuck open, causing overcooling or fail to open, resulting in overheating. Symptoms include erratic temperature gauge readings or prolonged engine warm-up times. Replacing the thermostat is typically necessary to restore proper cooling system function.
Radiator Blockages
Over time, debris and mineral deposits can accumulate in the radiator, reducing its efficiency in dissipating heat. This can lead to engine overheating, particularly during aggressive driving or hot climates. Flushing the radiator regularly and using high-quality coolant can help prevent blockages and maintain the system’s performance.
Exterior and Bodywork Problems
The exterior design of the A 35 AMG exudes elegance and aerodynamic efficiency, but some owners have reported durability concerns that affect the vehicle’s aesthetics and structural integrity.
Paint Quality Issues
Paint peeling, chipping, or fading is a common complaint among A 35 AMG owners. These issues can result from exposure to harsh environmental conditions, such as UV rays, road debris, and salt. Poor paint adhesion in some areas may also contribute to these problems. Applying protective coatings and addressing chips promptly with touch-up paint can help maintain the vehicle’s appearance. Professional repainting may be required for extensive damage.
Water Leaks
Water leaks into the cabin have been reported by some owners, particularly around the sunroof, windows, or door seals. Faulty seals or clogged drainage channels are often the cause. Water intrusion can lead to unpleasant odors, mold growth, and damage to interior electronics. Regularly inspecting seals and clearing drainage channels can prevent water leaks and protect the vehicle’s interior.
Rust and Corrosion
While the A 35 AMG features rust-resistant materials, some owners in colder climates or coastal regions have reported rust forming on the undercarriage, wheel arches, and other exposed areas. Road salt used during winter can accelerate this process. Regular washing, especially during winter months, and applying rust-proof treatments are essential to mitigate rust.
Mercedes-Benz A-Class W177 A 35 AMG Advanced Driver Assistance System (ADAS) Glitches
The A-Class W177 A 35 AMG has advanced driver assistance systems (ADAS) to enhance safety and convenience. While these systems offer impressive functionality, they are not immune to glitches.
Lane-Keeping Assist Issues
The Lane-Keeping Assist system is designed to keep the vehicle centered in its lane, but some owners have reported problems with its sensitivity or accuracy. Sometimes, the system may fail to detect lane markings or provide unnecessary corrections. Cleaning the sensors and cameras and properly calibrating the system can help address these issues.
Blind Spot Assist Malfunctions
Blind Spot Assist is another valuable feature that sometimes fails to function as intended. Some owners report false alerts or instances where the system does not detect vehicles in adjacent lanes. Regular maintenance of sensors and software updates are necessary to ensure consistent performance.
Adaptive Cruise Control (ACC) Glitches
Adaptive Cruise Control, which adjusts the vehicle’s speed to maintain a safe distance from other vehicles, has disengaged unexpectedly or failed to respond to traffic conditions appropriately. These glitches are often linked to sensor malfunctions or software errors. Professional inspection and recalibration of the system can resolve most of these issues.
Mercedes-Benz A-Class W177 A 35 AMG Wind Noise and Insulation Concerns
Although the A 35 AMG is designed to provide a quiet and refined cabin, some owners have reported issues with wind noise and insufficient insulation.
Wind Noise at High Speeds
Wind noise is a frequent complaint, particularly at highway speeds. Poorly sealed windows, misaligned doors, or gaps in the weather stripping are common causes. Inspecting and replacing worn or damaged seals can reduce wind noise and improve the cabin’s quietness.
Insufficient Cabin Insulation
Some drivers find the level of insulation in the A 35 AMG to be inadequate for a vehicle of its class, particularly regarding road and tire noise. Adding soundproofing materials to the doors, floor, and wheel wells can enhance cabin acoustics and overall comfort.
Long-Term Reliability Concerns
As the A-Class W177 A 35 AMG ages, long-term reliability concerns can arise, especially if maintenance is neglected.
Timing Chain Stretch
Timing chain stretch is a known issue in high-mileage A 35 AMG models. A stretched timing chain can lead to a rattling noise from the engine and affect engine timing, resulting in reduced performance and potential damage. Replacing the timing chain at the first sign of wear is essential to prevent costly repairs.
Turbocharger Wear
The turbocharger in the A 35 AMG is built for performance but can experience wear over time, especially with aggressive driving. Symptoms of a failing turbocharger include reduced power, increased fuel consumption, and a whistling noise from the engine bay. Regular maintenance and avoiding prolonged high-stress driving can extend the turbocharger’s lifespan.
Electrical Component Aging
Electrical components such as wiring, connectors, and control modules may degrade as the vehicle ages, leading to intermittent faults and reduced system reliability. Routine inspections and replacing aging components can help maintain the vehicle’s functionality and prevent unexpected failures.
Conclusion
The Mercedes-Benz A-Class W177 A 35 AMG is a dynamic and luxurious vehicle with exceptional performance and state-of-the-art technology. However, like any high-performance car, it comes with its challenges. From engine and transmission issues to suspension, cooling systems, and electrical faults, understanding these common problems can help owners take proactive measures to maintain their vehicles.
Trust European Auto Pro, 253 Goodwood Road, Kings Park, 5034 South Australia for professional diagnostics, repairs, and maintenance. Their skilled technicians specialize in Mercedes-AMG vehicles, ensuring your A 35 AMG remains in peak condition and delivers a thrilling driving experience for years.