I have a 2011 Smart W451, and there's a buzzing noise after starting the engine. Here's what's happening: when I start the engine, everything is normal for the first 2 seconds, but after that, a low-frequency buzzing sound begins. The noise seems to come from the rear of the engine, near the inside of the passenger side. There are no fault codes, and everything else like acceleration and speed is smooth with no issues. I recently changed the fuel pump and haven't finished a full tank yet. The noise inside the car seems to be coming from below the passenger seat but slightly forward. I've changed the engine mounts, and the alternator belt looks fine. Has anyone experienced the same issue? Any help would be appreciated.

I have a 2011 Smart W451, and there's a buzzing noise after starting the engine. Here's what's happening: when I start the engine, everything is normal for the first 2 seconds, but after that, a low-frequency buzzing sound begins. The noise seems to come from the rear of the engine, near the inside of the passenger side. There are no fault codes, and everything else like acceleration and speed is smooth with no issues. I recently changed the fuel pump and haven't finished a full tank yet. The noise inside the car seems to be coming from below the passenger seat but slightly forward. I've changed the engine mounts, and the alternator belt looks fine. Has anyone experienced the same issue? Any help would be appreciated.

There is a buzzing noise while the vehicle is in motion, but I'm not sure where it's coming from. The mechanic thinks it's too much trouble to check and says it's fine as long as there are no fault codes in the car's computer.

Do you also hear noise from the engine while inside the car?

Hey car enthusiasts, does your Jeep Renegade have a lot of engine noise inside? I feel like the engine noise in my 1.3T is particularly loud.

Can the original engine oil of the 90 Zilong Edition last for 10,000 km before needing a change? Changing it every 5,000 km seems too frequent.

There are knocking noises coming from the chassis, like "gudong gudong" and "gadeng gedeng". I replaced all 4 shock absorbers, but the noise persists. I checked the ball joints and the steering rack, but everything seems fine. Not sure where the noise is coming from in the Peugeot 301.

I heard there's a new model coming out this year? Engine change + mild hybrid?

Hey everyone, does anyone else have strange noises coming from the front passenger seat or the trunk? 🤔

What could be causing this issue with the 2011 Volvo C30? When shifting to 2nd gear, the engine makes a buzzing noise. There are no fault codes, but there is a throttle body fault code for the engine.

Does your SUV make a buzzing noise from the rear passenger side when driving at speeds of 20-30 on bumpy roads? There's no such sound from the driver's side. Without some music, it's really hard to ignore that noise!