abs light and one below are on and wont go off been plugged in at a garage today and been told front passenger side speed sensor as when plugged in and going along no speed reading on the computer. does anyone know how hard these are to fit etc or best place to get one my local skoda dealer says there is one in the wheel bearing and another but it doesnt sound like the wheel bearing is going any help ? as i need to fix

Cheers Jake

Did one of these the other day, they are £29 from the dealer, part number is 1J0927803 for front l/h side or 1J0927804 for front r/h.

All you need to do is take the wheel off, unplug the multiplug from the sensor then unbolt the bolt on the hub that holds the sensor in place.

You should then be able to pull the old sensor out and replace it, if it won't come out though then take the brake caliper and brake disc off and use a flat bladed screwdriver or similar to push the old sensor out from the front.

You'll need to clear the fault codes and take the car for a drive afterwards to get the lights to go out.

What the dealership were on about with the wheel bearing is theres a metal rotor that the sensor reads off of, if you have the brake disc off you should be able to look down and rotate the wheel and see if this rotor is broken, if it needs replacing then the part number is 1J0614149 but you'll need a hub puller and torque wrench as you'll need to take the hub apart and put it back together. Hopefully it should just be the sensor thats broken though.

Edited 21 August, 200916 yr by chicken_eyebrow

It's wise to check the simple things first. Check to make sure there's no dirt or mud built up between the sensor and the rotor. This is not uncommon, and if there is the sensor will not be able to detect wheel rotation, and so give it a good clean. This is not an uncommon problem with ABS sensors.

Wheel sensors are inductive pulse and can easily be checked with a multimeter. If this is the case the sensor will have two wires. Disconnect the sensor and connect your probes across the sensor and measure its resistance, which should be several hundred ohms. I don't know the exact figure but you could measure one of the others to compare. Then switch to AC volts and spin the wheel. You should now read a small AC voltage, but the faster the wheel spins the higher the voltage reading. Make sure you're on AC volts, and not DC volts. The ECM converts to DC so don't worry about that. Re-connect the sensor and see if the ABS lamp now works as it should do.

Check this first before condemning the sensor. If it works as described above there's no point in replacing it as the fault lies elsewhere........