C0105 and C0109

[ohno06gt]

On the way to work today my abs light popped on.   C0105 for rear right speed sensor and C0109 for power voltage malfunction.  Battery tested good and alternator is charging well.

 

Any ideas on how to narrow down the issue?  

[KZJonny]

Pop out the wheel speed sensor and have a look.

They get damaged when the tone ring gets bent and cuts a notch out of them. Commonly anyway, I’ve replaced at least 2 of mine and had to slightly bend back the tone ring on the axle so it wouldn’t contact.

If the sensor looks fine, you might have a wiring problem further up the system. The connection where the sensor meets the body is kind of exposed to the elements, so maybe take that apart and hit it with some connection cleaner/de-oxit and try again?

fwiw, the sensors and their retaining bolt can be pretty rusted in, I’d definitely consider soaking it in your best penetrating agent for a day or two before trying to take it out…. Heat is likely to melt the sensor.