C0040

Right Front Wheel Speed Sensor Circuit

Severity: Medium ABS / Chassis Generic OBD-II Code Est. Repair: $100 - $300

Schedule diagnosis soon. Continued driving may worsen the issue.

What Does C0040 Mean?

ABS fault related to right front wheel speed sensor.

Common Symptoms

ABS and/or traction lights on

Possible Causes

Failed sensor
Tone ring
Wiring
Connector

How to Fix C0040 – Repair Guide

Inspect RF sensor, wiring and tone ring
Replace as needed
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Recommended OBD2 Scanners & Tools

To read and clear this code yourself, you need a reliable OBD2 scanner. Here are top-rated options:

BlueDriver Bluetooth Pro OBDII Scan Tool

Professional Bluetooth scanner with live data, enhanced diagnostics (ABS/SRS) and repair reports. Works with iPhone & Android. No subscription fee.

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ANCEL AD310 Classic Enhanced OBD2 Scanner

Best-selling handheld code reader. Read & clear engine codes, live data, freeze frame. No phone required. Highly rated for beginners.

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FIXD Bluetooth OBD2 Scanner

Simple plug-and-play sensor that explains codes in plain English via free app. Ideal for first-time users.

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.