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Discussion Starter #1
Hi guys,

I have had my ABS light on for a few months now and today had it checked. The diagnostic confirmed it is the front passengers side sensor in open circuit. I had a look today at the sensor and it was rusted on and in trying to remove it, it broke off :rolleyes:. I am probably going to need not only a new sensor but also a new hub. The trouble is my MOT is due in two weeks and funds are tight right now. My question is has anyone by-passed the sensor with a resistor to fool the ABS controller so that the light goes out? I read that a 1k resistor might be ok?

Cheers guys

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ABS sensors generate a pulse to give the ECU a wheel speed reading, so a resistor won't work.
 

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Like Dave said, a resistor won't work. Try finding a S/H hub assembly complete with sensor from one of the specialists. Those things NEVER come out, so the chance of a S/H sensor alone is pretty remote.
 

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Sensor needs to generate an ac voltage when car moves so as said before, you cannot fool it.
Google europarts, they sell abs sensors for about £54 and are genuine bosch units, get a drift and smash the old sensor out and replace with new item, bosch sensor is a tight fit so don't worry if you break the bolt that holds the sensor in, the sensor ain't gonna move anyway :)
I know this as I did mine a few weeks ago. :)
 

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Discussion Starter #5
Sensor needs to generate an ac voltage when car moves so as said before, you cannot fool it.
Google europarts, they sell abs sensors for about £54 and are genuine bosch units, get a drift and smash the old sensor out and replace with new item, bosch sensor is a tight fit so don't worry if you break the bolt that holds the sensor in, the sensor ain't gonna move anyway :)
I know this as I did mine a few weeks ago. :)
Thanks for the info. You are right about the tight fit. The sensor is stuck in and half of the bolt :cheese:

I am thinking of putting the car in for its MOT to see if it does pass just to hopefully buy me some time before I have to pay for a new sensor. :)

Cheers

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you could always remove the ABS system fuse. I did that when the ABS activation ring broke on my missus' Primera and not only did it pass the MOT, but it had the benefit if stopping the brakes going boing everytime the speed dropped below 10 mph.

Of course, you won't have any ABS, and there will be a dash warning that may catch the tester's eye, but might be worth a try if you simply can't do the repair in time.
 
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My car with an abs sensor down was horrendous. If you braked before the system realised the sensor was shagged it was like driving on ice. The ABS did what it thought was right, but all four wheels on a dry road with a sensor down was interesting. When I took it back to the garage they wouldn't even come for a test ride with me!! I was so pissed off at their work I was determined to scare them into action!! I needed a new wheel bearing that they had damaged removing a driveshaft. I hope your car is an easy fix!!
 

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If the warning light does not function correctly i.e. come on briefly then go out when the ignition is turned on, or does not work at all, it will fail the MOT. Unless, of course, the tester doesn't notice.
 

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I replaced a sensor on my 166 and the same thing happened. To resolve, I drilled the old sensor out of the carrier. What you'll find is that it is the two (or is it one, I forget) captive locating screw holes that seize up. Drill these out as well and refit with a nut & bolt. Once you've drilled the sensor out of the mount, getting the new one back in is easy.

To pass the MOT, you'll need to either hope that the MOT tester doesn't see the ABS light, or somehow make sure that the light doesn't illuminate. The most common way of doing this is to blank off the bulb or remove it from the holder until the sensor is replaced.
 

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Discussion Starter #10
Just thought I would post an update.

I bought a new sensor from europarts, took 45mins to fit this morning. Started the car up and the light has gone out :D. The MOT is next saturday, feeling more confident now............but its still an Alfa so who knows? :rolleyes:

Cheers

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