Polo Mk4 1.2 12v ABS sensor and drive shaft issue

[Phantome46]

I have a very strange issue at the moment which I am hoping somebody has seen before

I have recently had an issue with the polo - that required me to replace the passenger NSF drive shaft.

I purchased one from a breaker on ebay and it arrived. Compared it tot he one i took off and it look OK so I fitted it. Car worked fine - until i read tested it. ABS light came on.

Diagnosed it to NSF and then took out the sensor and sure enough it was worn right down like it was rubbing on something? (attached pic)

So I purchased a new sensor - installed and then drove the car and light went off.

Drove the car for about 5 miles and after about 4 miles ABS light came on - red brake light started flashing and then car was beeping at me.

Jacked it up and looked at new sensor and the side of the sensor has been worn away by rubbing on the drive shaft.

When i then looked through the hole that the sensor fits I have noticed that the drive shaft fitted has a very slight lip on it which steps up towards the engine side of the car and that is hitting the sensor rubbing it away.

Net result - i've broken a second sensor so am thinking must be an issue with the wrong drive shaft?

Can somebody help?

[zollaf]

without seeing the drive shaft, i woudl say, that since there wasn't a problem with the old driveshaft, that yes, the new shaft is the wrong shaft. take it out and compare it properly to the old one.

[Phantome46]

without seeing the drive shaft, i woudl say, that since there wasn't a problem with the old driveshaft, that yes, the new shaft is the wrong shaft. take it out and compare it properly to the old one.

I have removed the current shaft and very carefully compared it to the old one and they are exactly the same - length, profile etc. so I refitted it. I added a small bit of car body filler to the bottom of the old sensor to build up the original shape and then refitted it. I turned the wheel and it was slightly rubbing. so i removed it and then removed the drive shaft and this is what I'm seeing



Only a very small portion of the sensor plastic is touching the drive shaft and it wears a few mm off the corner of the sensor and then seems ok? Is this normal - i doubt that the sensors are designed to wear down to the correct position to ensure optimum gap? But other than that I'm stuck?

[micheal balbrig]

How does the sensor get its signal on your car.?

[Phantome46]

How does the sensor get its signal on your car.?

absolutely no idea to be honest? think its a magnetic pulse from D/S to sensor - but this is exactly the same as it was before it was dismantled

[Phantome46]

Has nobody come across this issue before? I was hoping for some tech expertise to help me solve this one?

Thanks

[micheal balbrig]

As Zollaf said earlier it may be a different shaft although looking similar.
Do you have the old c/v joint to fit in to see if it runs free in the unit,This would be only for trial.

[zollaf]

post up 2 pics, one of the old shaft and one of the new one. incidentally, the shaft pictured doesn't have a reluctor ring fitted so isn't compatible with abs anyway ??

[Phantome46]

just run code reader to understand the current fault and have 2 codes:

1 - 00283 -

00283	P1711	ABS Wheel Speed Signal #1 (Left Front) - Range/Performance - G47

2 -

00597	P1728	Varying ABS Wheel Speed Signals - Range/Performance

[zollaf]

pics of the original shaft ???