ABS sensor failure

So it seems these things happen in threes! The ABS sensor light came on the dash for the second time in my ownership. This means parts of the ABS system is not working and so the system is deactivated. Typically it is an ABS sensor on one of the wheel hubs that has failed and needs replacing. While the light is on, the ABS system will not be functioning, so be aware that you are likely to lock up the wheels under heavy braking especially in wet conditions.

Replacing an ABS sensor is quite a straightforward job and can save you money on garage bills if you choose to do it yourself. All you need are some basic tools, and ideally a sturdy vice clamped to a bench or similar.

To diagnose which ABS sensor is at fault and how to replace it, I’ve written a guide here to talk you through the process.

Airbag light revisited

Airbag warningSince I , the Airbag light has intermittently come on the dash console. As you may know the connectors under the seats are the prime culprit for this. I connected them up with bullet connectors which have obviously worked loose with the seat moving back and forward. Luckily I didn’t have to remove the seats again, but simply ensured the connections were sound by reaching underneath and securing them. Hey presto, no airbag light on the dash cluster. Another cheap and quick fix ready for the MOT

How to fix the alarm on the 106 GTi

Ultrasonic Alarm sensorThe GTi is the only car in the 106 range to have a factory fitted alarm system. However French electrics being what they are often means the alarm system more often than not can cause trouble over the years. You may find yourself wearily having to get up in the middle of the night to turn off the alarm as your neighbours curtains twitch and give you the evil eye! Fear not the solution is actually easier than you may think. For almost a year now I’ve been disabling the ultrasonics (the sensors that detect air movement inside the car when the alarm is activated) every time I got out the car. This is obviously far from ideal. So I finally decided to stop being lazy and fix the issue. You’ll need to buy 1 or 2 new ultrasonic sensors (I had a pair from a friend – buying two means you can be sure you’ve cured the problem).

  • Start by removing the top of the door seal and pulling the A pillar trim back from its clips. This will expose the sensor wire.
  • Remove the sensor from the trim
    Troublesome alarm
  • Cut the sensor wire about halfway down and strip back the wires.
  • Pull the spades from the plug on the new sensor
  • Clip two spade connectors onto the car wiring.
  • Plug the spades into the new connector
  • Wrap up the wiring with some electric tape if necessary to keep it tidy
  • Connectors

  • Now before packing away the wiring, I suggest waiting for a time when you will be in the house all day so you can lock the car and check that the alarm doesn’t go off without cause.
  • If the new sensors work, carefully place them back into the A pillar trim and refit the trim.
  • Refit the door seal
  • Now test the alarm by sitting in the car and locking it with the key fob and waving your arms. If the sensors are functioning the alarm should go off.
  • Pack up and enjoy the peace and quiet


Ah French cars…

I started the Peugeot for the first time in two months today after being laid up with a severe knee injury and was amazed to see it fired into life first time! Reversing off the drive, it was clear the brakes were a little rusty as they were very ‘grabby’ however these cleared after a little braking. What was odd, however was the stuttering that occured; The engine seemed to lurch and stutter quite badly, especially on part throttle. I thought this might be the Coolant Temperature Sensor or lambda signals not working properly, perhaps water ingress over the last 9 weeks was affecting the signals received or sent by the ECU. However after the first journey of 3 miles, all was well again, and the car was behaving itself. The joys of French cars!

ABS sensor failure

ABS lightSince the ABS light was on the dash (an MOT failure) I set about trying to solve the issue. First up was the issue of trying to figure out which sensor was at fault. Usually a garage will use the diagnostic machine to find out which sensor is providing faulty or no reading. Obviously I don’t have the diagnostic machine on hand, but there is another (cheaper) way…
I signed up on 106owners.co.uk to become a full forum member for £5. This allows you to view the diy guides, one of which is diagnosing an ABS sensor failure. For full members the article is here. Using the guide I determined that the N/S/R sensor was at fault.

I logged onto the Eurocarparts website and ordered the correct ABS sensor for the car. Lo and behold it arrived, and turned out to be the wrong ABS sensor. So I sent it back and browsed ebay for the correct sensor. Having ordered the sensor, a nice Glaswegian guy called to check my registration and make sure it was the correct one. The sensor arrived and was thankfully the right one.

To change the sensor first get under the rear of the car and trace the ABS sensor back under the rear beam to the blue plastic plug. Remove this and work your way back to the hub, removing the
cable clips as you go. To get the old ABS sensor out requires patience and brute force!
Remove the rear disc protector by removing the 3 torx screws in the back of the hub. Next its helpful if you remove the brake pad carrier and brake disc. This allows you full access to the ABS Sensor. A set of Mole grips are very useful for grabbing the sensor and removing it. If it’s never been changed, you’ll need patience as it will almost certainly be near-seized in the hub. You will destroy the sensor on removing it, I managed to pull the electronics out of it metal casing! To removed the casing from the hub I had to hammer it with a screwdriver until finally, it came out. Clean the hole in the hub and gently work the ABS sensor in until it is in place. Once the ABS sensor is connected up, it will take time for the ABS ECU to recognise the sensor is now working and turn off the ABS sensor light on the dash, so take the car for a run for a few miles and job done.

Brake light fix

Brake light issuesThe 106 has had a rear brake light out for a while now. I’d checked the rear bulbs, circuit board and wiring were all ok so I took a chance on and bought a brake pedal switch from Peugeot in the hope that it was the switch at fault.

The part number for the switch is 4534.52

Now although it’s awkward to position yourself to see/feel the brake switch, it is very easy to change. I managed to spend about 3 minutes looking for the switch and 2 minutes changing it over!

Youll need to open the drivers door and lean down head first into the footwell. Position yourself to look up to the top of the brake pedal. You might have to pull a little bit of carpet out of the way. Push the brake pedal down with your hand and you will see the switch at the top of the pedal’s travel. To remove the old switch, unclip the loom from the top of it. Now grab the top of the switch and wiggle it back and forward until the ribbing on the bottom half of the switch slides out and you can withdraw it.

Push in the new switch, reconnect the loom and test your brake lights. Hopefully you’ll just have solved the problem for a few pounds and 5 minutes of your time!

Brake light problem

My brother noticed at the Angelesey trackday that the offside brake light wasn’t working. Fine I thought, a two minute job to swap out the bulb. Oh no, not on a Peugeot. Turns out the bulb is completely fine, but for some reason the circuit is not working when the brake pedal is pushed.

So I whipped the multimeter out and I successfully tested 12V for the rear lights, but nothing on the circuit board when the brake pedal was pushed. I removed the plug for the light and tested for 12V. Again, nothing.

I am down to 2 possible culprits at the moment. A broken wire in the loom and a faulty brake switch on the pedal. The brake switch is quite cheap so that is my first area of investigation.

Another French electric problem, that rapidly becomes a pain in the rear!