Repair manuals and video tutorials on MERCEDES-BENZ A-Class

Engine

• A fuel pump control unit of W176 cars often fails. This leads to the engine reduced output and stall. You can install a new device yourself having downloaded an illustrated PDF manual on Mercedes-Benz A-Class repair.
• Fuel injectors of diesel engines in W168 and W169 cars can clog. Signs of this include excessive smoke emissions during engine warm-up and its unstable idling. The injectors should be replaced by specialists, as they require further adjustment. You can extend the lifespan of the parts by using only high-quality fuel and changing the fuel filter in time. You will be able to do it in your garage with the help of our step-by-step video tutorial on Mercedes-Benz A-Class repair.

Transmission

• A stepless transmission control unit of W168 and W169 cars is hardly reliable. Its overheated or cracked housing may result in the decrease of vehicle’s performance and delay in gear shifting. A new device should be mounted at a car repair shop. Our tip for you is to replace transmission oil in due time. Download our Mercedes-Benz A-Class DIY repair and maintenance tutorial for free.
• A propeller shaft bearing of W169 cars can go bad. The symptoms of this are humming and shuddering during acceleration. The part should be replaced with a new one at a car repair shop.

Steering

• Frequent off-road driving can lead to the steering rack deformation and leakage. If it fails, you will hear rattling while driving and turn the steering wheel with significant effort. The part should be replaced as a whole assembly at a service station.
• The moisture ingress causes an electric power steering motor burn-out and a steering angle sensor failure. The signs of the unit malfunctioning are humming while turning a steering wheel and its jamming in a certain position. A specialist should install new components.

Suspension

• Ball joints break down fast. You can tell they’re defective if there are a rattling sound in suspension, wheel play, uneven tyre wear-out. You can replace the components yourself following our step-by-step Mercedes-Benz A-Class repair and operation instructions. Once you have done it, check and align wheels if necessary.
• Bushings of suspension arms of W169 cars wear out fast. If a body rolls and there are squeaks while driving on road irregularities, install new spare parts according to a video tutorial.