C0040 Wheel speed sensor problem (right front)

Check this first

Look at the sensor wiring at the wheel – it flexes over every bump and breaks there first. ABS and traction control switch off with this code, so allow more room.

Reading ABS codes needs the brand pack for your make.

What usually fixes it

In the order a good shop checks them. Typical total: $124–$1,006 at $130 an hour.

1. Wheel speed sensor

   $144–$362

   Sensors fail from road salt and heat.

2. Wiring at the wheel

   $176–$444

   The wire flexes with the suspension until it breaks.

3. Tone ring or bearing

   $340–$1,006

   A cracked tone ring or worn bearing upsets the signal.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.