2020 Mercedes-Benz Sprinter 1500 Has Rough Idle

Resolve Rough Idle in 2020 Mercedes-Benz Sprinter 1500 for a Smoother Ride

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2020 Mercedes-Benz Sprinter 1500 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Mercedes-Benz Sprinter 1500 has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the steps to diagnose a rough idle in a 2020 Mercedes-Benz Sprinter 1500?

When diagnosing a rough idle in a 2020 Mercedes-Benz Sprinter 1500, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by connecting a diagnostic scanner to the vehicle's computer system to check for any fault codes, as these can quickly point you toward underlying issues. Next, inspect the spark plugs for wear or fouling, as these components are crucial for proper engine performance. A clean air filter is also vital; ensure it is free from debris to maintain optimal airflow. Following this, examine the fuel system, including the fuel filter and injectors, to confirm that fuel delivery is not compromised. Additionally, inspect vacuum hoses for leaks, as any disruption in the air-fuel mixture can lead to a rough idle. Testing the mass airflow sensor is another critical step, as a malfunction here can significantly affect engine performance. Finally, don't overlook the throttle body; a buildup of carbon or dirt can impede airflow and contribute to idling issues. By methodically following these steps, you can effectively identify and resolve the causes of a rough idle in your Sprinter.

What are the common problems that could cause a rough idle in a 2020 Mercedes-Benz Sprinter 1500?

When dealing with a rough idle in your 2020 Mercedes-Benz Sprinter 1500, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the first areas to check is the air filter; a dirty or clogged air filter can significantly restrict airflow to the engine, resulting in an uneven idle. Additionally, the oxygen sensor plays a crucial role in maintaining the correct air-fuel mixture, and if it's faulty, it can lead to rough idling as well. Another potential culprit is a vacuum leak in the intake system, which can disrupt the balance of air and fuel entering the engine. It's also important to inspect the spark plugs; worn or malfunctioning spark plugs can cause misfires, contributing to a rough idle. Furthermore, issues within the fuel system, such as a clogged fuel filter or a failing fuel pump, can hinder engine performance and lead to idling problems. Lastly, don't overlook the ignition system; components like the ignition coil or distributor can also cause rough idling if they are not functioning correctly. By systematically checking these areas, you can identify and address the root cause of the rough idle, ensuring your Sprinter runs smoothly.

How urgent is it to address the rough idle in a 2020 Mercedes-Benz Sprinter 1500 to prevent potential safety risks or engine damage?

Addressing a rough idle in your 2020 Mercedes-Benz Sprinter 1500 is not just a matter of comfort; it is a critical safety concern that demands immediate attention. A rough idle can indicate serious underlying problems such as misfiring cylinders, clogged fuel injectors, or a malfunctioning oxygen sensor. Ignoring these symptoms can lead to decreased fuel efficiency and increased emissions, but more importantly, it can escalate into significant engine damage over time. The instability caused by a rough idle can compromise your vehicle's drivability, especially in low-speed situations or when idling in traffic, posing a risk to both you and other road users. Therefore, it is essential to diagnose the root cause of the rough idle promptly and perform the necessary repairs or maintenance. By doing so, you not only ensure the smooth operation of your vehicle but also safeguard against potential safety hazards and costly repairs down the line.

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