How can I fix the slow start and jerky shifting of my Volvo S40?

How can I use a USB drive to play music on a 2012 model? It shows an error in English saying it's unreadable.

Is it a problem with the ignition switch if the Volvo S40 key is turned to the second position, but there's no power and it reports an engine anti-theft system fault? I changed the ignition switch, and now it's sometimes good and sometimes bad. Sometimes the dashboard lights up, sometimes it doesn't, and sometimes it even starts automatically.

Hi everyone, can someone tell me how to set up the automatic door lock for a 2010 Volvo S40? Thanks!

When starting the car, the battery has power but the engine doesn't respond.

The temperature settings for both the driver and passenger sides are the same, but the passenger side is blowing hot air while the driver side is blowing cool air. What's going on, experts?

The air conditioning filter for the 2011 Volvo S40 is typically located behind the glove compartment. To access it, you usually need to open the glove compartment and remove any screws or clips that hold the compartment in place. Once removed, you should be able to see the air filter housing and replace the filter.

Volvo S40 2.0 Smart Edition showing a "Power System Emergency Maintenance" alert, what does this mean? Is it serious?

The dashboard reported low transmission performance, and then the car wouldn't accelerate. After restarting, the warning light went off and it drove normally. What could be the reason? (The onboard computer cleared the fault light, but it came back on before I got home.)

When starting, there's a noticeable vibration, but the higher the speed, the less the vibration. There's no vibration when coasting, but as soon as you accelerate, you feel it, especially at lower speeds. Why is that? There's no unusual noise. I've already replaced the left half axle, engine mounts, and recently changed the tires and ignition coils. The repair shop says it's an issue with the transmission and it needs repairs. Is that true? 😮‍💨

Is there any other way to open a Volvo S40 if the remote doesn't work? Thanks.

Is there a problem with the wipers not stopping?

I want to ask how fast this car can go at top speed on the highway.

When the air conditioning blows cold air for a while and then switches to hot air, and after being turned off for a bit, it works again before reverting to hot air, it's puzzling. Interestingly, this issue doesn't occur on rainy days or when the weather isn't too hot. What could be the cause of this situation?

Why does it sometimes feel like the brake and accelerator are hard when I start the car, and other times they're soft? It feels uncomfortable to drive when they're hard.