VW Polo Brake Sensor Light on but Brakes are fine!!
I have a 2002 VW Polo which has the Brake sensor light keep coming on when I'm driving even when I'm not using the Brakes! I haven't found many other people with the same problem, I have taken the car to kwikfit who checked all the brake pads and calipers etc. and found no problems and they were not worn so I'm stuck with where to go next. I know if VW take a look they will charge a fortune and I know there's no problem with the brakes it's a full service history 42k miles car so I really wasn't expecting these sorts of problems, help!!!
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Remove the electric sender and install mechanical oil gauge to check that you have proper oil pressure. Bet ya the main bearings are not fitted correctly or the engine wasn't cleaned during overhaul and now bearings are trashed.
Make sure the batter in your vehicle is good and the connections are tight. A weak battery in a VW will cause all sorts of lights to go off on your dashboard even if there isn't a problem. If you suspect one of the sensors to be bad you will have to use an OBDII scanner to pull the codes and see which sensor is showing a fault.
It is a wiring fault, but they are looking on the wrong end. You will need to have a VW dealer "repin" the electrical connector at the throttle body. What this means is, the dealer will take apart the connector, cut off the old pins and crimp on new ones and reassemble the connector. This is a common problem on drive by wire VW's. The dealer has a bulletin on the problem and I don't know why they missed it. They will probably have to order the connector kit however. Good luck!
Check the level of the brake fluid, as the pads wear down the fluid level falls slightly and the sensor reacts and gives the warning, it may happen more as you are cornering and the brake fluid moves, try gently topping up the brake fluid it doesn't need much..
I have come up against this problem a few times before.
If the ABS. light is NOT on, and its the ESP light only that is
on...your problem may well be a faulty Yaw sensor. This unit is fitted
to the floor panel under the rear seat...in the centre. Another problem
(although not all that common) is a faulty ESP switch. You should have
an OBD code reading done to make sure. If a new YAW sensor must be
fitted, the car must be driven with a full steering lock in both
directions (left and right) at a speed over 20 Km per hour after
fitting. If this is not done the light will remain on, even though it
will now drive ok.
As for the price of this unit...Here in Ireland it costs around 140
euro. Hopefully its cheaper where you are. So better to have the codes
I hope this is of some help to you.
Good luck with it