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What is the reason for the buzzing sound inside the Mercedes-Benz E300?

2 Answers
McCharlie
07/29/25 4:55pm
The buzzing sound inside the Mercedes-Benz E300 is caused by the operation of the secondary air pump, which is designed to pump air into the exhaust pipe. This process facilitates the secondary combustion of exhaust gases and helps the catalytic converter reach its optimal operating temperature more quickly. This sound only occurs during cold starts and operates a maximum of two times. Below is an introduction to the Mercedes-Benz E300: 1. Body dimensions: The length, width, and height are 5078mm, 1860mm, and 1490mm respectively, with a wheelbase of 3079mm and a fuel tank capacity of 66 liters. 2. Suspension: The front suspension is a multi-link independent suspension, and the rear suspension is also a multi-link independent suspension. 3. Powertrain: It is equipped with a 1.5L turbocharged engine, delivering a maximum horsepower of 184 PS, a maximum power of 135 kW, and a maximum torque of 280 Nm, paired with a 9-speed automatic transmission.
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AnaRose
08/14/25 6:50am
When I was driving my Mercedes-Benz E300, I encountered a buzzing sound inside the car. It happened during a weekend outing, and the constant humming was really annoying. I guess you've had your fair share of this issue too. There are quite a few possible causes, with the most common ones being doors not closed tightly, seatbelts not fastened, or keys stuck near the ignition switch—these minor oversights can easily trigger system alerts. It could also be that the glove compartment or trunk isn’t properly locked, or sensors are clogged with dust causing false alarms—like the collision radar, which often acts up. My advice is to first check these areas yourself to make sure everything is properly closed. If the noise persists, it might be an electronic system malfunction, so it’s best to take it to a 4S shop to scan for error codes with professional tools. Don’t compromise driving safety, and regular car washes can also help reduce unwanted noises.
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