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2022 MX-5 Miata: ABS and Traction Control Lights On After Pothole

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Mike T. · rep 0 · May 25, 3:31 AM · 1 replies · solved · Question

Vehicle: 2022 Mazda MX-5 Miata Club

Hey everyone,

My 2022 Mazda MX-5 Miata Club just lit up the ABS and Traction Control warning lights on the dash. This happened right after I hit a pretty nasty pothole on the highway yesterday. The car seems to drive fine otherwise, but those lights are definitely concerning.

I don't have an advanced scanner that can read ABS codes, just a basic OBD-II one. Could this be a damaged wheel speed sensor, or something more serious like a fault in the ABS module itself? What's the best way to diagnose this without specialized tools?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:31 AM

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ClearTheCode admin answer:

It's very common for ABS and Traction Control (TCS) lights to illuminate after hitting a significant pothole. This usually points to an issue with a wheel speed sensor or its related components. Since your basic OBD-II scanner won't read ABS codes, here's how you can proceed:

Common Causes After a Pothole:

  1. Damaged Wheel Speed Sensor: The impact could have physically damaged the sensor itself, which is located near the wheel hub.
  2. Damaged Wiring/Connector: The wiring harness leading to the wheel speed sensor might have been pulled, frayed, or the connector could have come loose or been damaged.
  3. Damaged Tone Ring/ABS Ring: This is a toothed ring (sometimes integrated into the wheel bearing) that the sensor reads. An impact could bend or damage it.
  4. Bent Wheel/Suspension Component: While less direct, a severely bent wheel or suspension part could affect sensor alignment or cause vibrations that trigger the light.

Diagnostic Steps You Can Take:

  1. Visual Inspection:
    • Carefully inspect the wheel and tire that hit the pothole. Look for any visible damage to the wheel, tire, or suspension components.
    • Locate the wheel speed sensor (typically mounted to the steering knuckle or hub assembly) for that wheel. It's usually a small electrical component with a wire running from it.
    • Check the sensor itself for cracks or physical damage.
    • Follow the sensor wire as far as you can, looking for any cuts, frays, or loose connections. Ensure the connector is fully seated.
  2. Clear Codes (if possible): While your basic scanner might not read ABS codes, sometimes disconnecting the battery for 15-30 minutes can reset some modules and clear 'soft' codes. Reconnect and see if the lights return immediately.

When to See a Shop: Since you can't read ABS-specific diagnostic trouble codes (DTCs), a professional diagnosis is highly recommended.

  • Specialized Scan Tool: A mechanic will use an advanced scanner that can communicate with the ABS module to read specific codes (e.g., C0031 for a left front wheel speed sensor fault). This code will pinpoint exactly which sensor or circuit is at fault.
  • Further Testing: They can also test the sensor's output with a multimeter or oscilloscope to confirm if it's sending a proper signal.
  • Safety: ABS and TCS are critical safety systems. It's important to get this resolved quickly to ensure your Miata's braking and stability control systems are fully functional.
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