boaterboy Posted August 24, 2012 Share Posted August 24, 2012 What is the purpose of the sensor in the front wheel bearing on a TD5, please? Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 24, 2012 Share Posted August 24, 2012 ABS and traction control wheel speed. Quote Link to comment Share on other sites More sharing options...
boaterboy Posted August 24, 2012 Author Share Posted August 24, 2012 Thank you, Jim. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 24, 2012 Share Posted August 24, 2012 and if they don't work you get the 'three amigos' I'd love to know who thought up that apposite name. Quote Link to comment Share on other sites More sharing options...
boaterboy Posted August 25, 2012 Author Share Posted August 25, 2012 Are the sensors fitted to the rear wheels, too? And if a sensor fails can it be replaced without replacing the whole hub? Quote Link to comment Share on other sites More sharing options...
western Posted August 25, 2012 Share Posted August 25, 2012 Yes, one sensor at each wheel station, they must be correctly set & connected otherwise you'll get the 3 'amigo's' = ABS/TC & park brake warning lights. Quote Link to comment Share on other sites More sharing options...
boaterboy Posted August 25, 2012 Author Share Posted August 25, 2012 And, if a sensor fails does that mean replacing the whole hub, please? And, that raises another question in my mind, does one get 'the 3 amigos' if only one sensor (say) fails? Presumably it's unlikely that 4 sensors will fail simultaneously? Quote Link to comment Share on other sites More sharing options...
western Posted August 25, 2012 Share Posted August 25, 2012 No, IIRC the sensor can be disconnected & replaced individually. there should be a plug/socket near the sensor. unlikely to have 2 or more go duff at one time unless rough offroading rips them off or pulls the wires out. Quote Link to comment Share on other sites More sharing options...
gadget Posted August 26, 2012 Share Posted August 26, 2012 The sensors are easy enough to replace, but: Buy wabco and not cheapies from aftermarket. Make sure there's NO rust under them when you refit. Quote Link to comment Share on other sites More sharing options...
boaterboy Posted August 26, 2012 Author Share Posted August 26, 2012 Thank you, Jim, Western & Gadget - all most useful information. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted August 26, 2012 Share Posted August 26, 2012 Some vehicles have a plug relatively close to the sensor, others (older ones IIRC) have the sensors wired right back to the ECU... Quote Link to comment Share on other sites More sharing options...
the real muddy90 Posted August 27, 2012 Share Posted August 27, 2012 My Disco had the lights come on last week, accompanied by beeps! The abs, tc & hdc lights (not hand brake). I took it in Saturday to get it checked & it was the nsr sensor, & the fault was canceled & went for a drive round. They've since come back on. I've checked for play in the wheel bearing but couldn't detect any, however, I was told you might not be able to!? Is that right? I think I'll change the sensor first before the hub as I need to do all the discs anyway. Quote Link to comment Share on other sites More sharing options...
gadget Posted August 27, 2012 Share Posted August 27, 2012 My nsr sensor gave the same symptoms as yours. It turned out that rust had built up under the sensor and lifted it enough that the gap between it and the reluctor ring was too great. The sensor was ok electrically, but the bracket was unwell. Replaced the sensor and cleaned the seat. It's been fine ever since. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 27, 2012 Share Posted August 27, 2012 My nsr sensor gave the same symptoms as yours. It turned out that rust had built up under the sensor and lifted it enough that the gap between it and the reluctor ring was too great. The sensor was ok electrically, but the bracket was unwell. Replaced the sensor and cleaned the seat. It's been fine ever since. This is why you can often fix a sensor problem with a 'technical tap' with a hammer. Sometimes removing the o-ring helps as well. Quote Link to comment Share on other sites More sharing options...
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