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2017 E400 ABS/ESP Warning Lights On - Sensor Issue?

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Steve N. · rep 0 · May 22, 4:16 AM · 1 replies · solved · Question

Vehicle: 2017 Mercedes-Benz E400

Hello forum,

I'm driving a 2017 Mercedes-Benz E400 (W213), and recently, the ABS and ESP warning lights have illuminated on my dashboard. They came on simultaneously and have stayed on. I haven't noticed any immediate changes in braking performance, but I know these systems are critical for safety.

I'm wondering if this could be a wheel speed sensor issue, as I've heard that's a common cause for these lights. Is there anything I can check myself before taking it to the dealer? I'm hoping it's not a major control unit failure.

Any advice or similar experiences with the E-Class would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:16 AM

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ClearTheCode admin answer:

Simultaneous illumination of the ABS (Anti-lock Braking System) and ESP (Electronic Stability Program) warning lights on your 2017 Mercedes-Benz E400 is a clear indication of a fault within these critical safety systems. While braking might feel normal initially, the systems are likely deactivated, meaning you won't have the benefit of ABS during hard braking or ESP to prevent skidding.

Common Causes:

  1. Wheel Speed Sensors: This is indeed the most frequent culprit. Each wheel has a sensor that monitors its rotational speed. If a sensor is dirty, damaged, or has a faulty wiring harness, the ABS/ESP control unit receives incorrect or no data, triggering the warning lights. Common OBD-II codes include C0031 (Left Front Wheel Speed Sensor), C0034 (Right Front Wheel Speed Sensor), etc.
  2. ABS/ESP Control Module: Less common, but the main control unit itself can fail. This is a more expensive repair.
  3. Brake Light Switch: A faulty brake light switch can sometimes confuse the ESP system, though it typically triggers different symptoms.
  4. Steering Angle Sensor: This sensor provides input to the ESP system. If it's faulty or out of calibration, it can trigger the lights.
  5. Low Brake Fluid: While usually indicated by a separate brake warning light, extremely low fluid can sometimes impact these systems.

Troubleshooting Steps:

  1. Check for OBD-II Codes: Use an OBD-II scanner capable of reading ABS/ESP specific codes. Generic scanners might only show powertrain codes. The codes will usually pinpoint which wheel speed sensor or other component is at fault.
  2. Visual Inspection of Wheel Speed Sensors: If a code points to a specific wheel, visually inspect the sensor and its wiring near the wheel hub for any obvious damage, corrosion, or debris.
  3. Check Brake Fluid Level: Ensure the brake fluid reservoir is at the correct level.

When to See a Shop:

Given the safety implications, it's highly recommended to have your E400 inspected by a qualified Mercedes-Benz technician as soon as possible. They have specialized diagnostic equipment (XENTRY/DAS) that can:

  • Read manufacturer-specific fault codes for ABS/ESP systems.
  • Perform live data analysis of wheel speed sensors and other components.
  • Accurately diagnose whether the issue is a sensor, wiring, or the ABS/ESP control module itself. Attempting to drive with these systems deactivated can compromise your safety, especially in adverse conditions.
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