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Warning Light an MOT fail?



Ash J

ClioSport Club Member
  182 Trophy #368
Quick question guys.

My MOT expires in just over a month.

Going to try and book it in within next week while I can and MOT’s still taking place.

I’ve had warning lights come on last few weeks (ABS, Serv, Traction). They go out when turn car off but will come on again.

Likely an ABS ring (front/rear) or brake light switch which I think it could be.

Would this be an MOT failure having these lights on?

Ash
 
  2005 Fabia Vrs
As said above it will do sadly, but I’ve just had my mot cancelled this Saturday and most mot stations by me are closing. Hopefully you can get it in somewhere.
 
  monaco 172
If the light comes on and remains on before you start moving it won't be a ring, it's more likely an abs sensor as the dodgy sensor will likely have an incorrect resistance and flag the fault straight away

If it's a ring it would usually come on once you start moving once it realised the ring is buggered.

Needs plugging in really, but if your handy with an oscilloscope and voltmeter it's pretty easy to work out which one is dead

But in answer to your question, if the light comes on during the test other than just after you start the engine and goes out, then yes it's a fail
 

MarcB

ClioSport Club Member
  Too Many
@Ash J could be a ABS Sensor along with ABS ring or brake light switch

I could be wrong but thinking if it was a break light switch your break lights would not work.

I had to change 3 ABS sensors on mine as all where goosed
 

Ash J

ClioSport Club Member
  182 Trophy #368
@Ash J could be a ABS Sensor along with ABS ring or brake light switch

I could be wrong but thinking if it was a break light switch your break lights would not work.

I had to change 3 ABS sensors on mine as all where goosed
Thanks for the reply Marc.

I changed the brake light switch yesterday as it was only £15 for a genuine one and worth a go. Hasn't changed anything though. I would say my brake lights seem to come on too late though, so will have another look at adjusting the switch to see if I can get them on earlier, but that seems to be a separate issue.

I now have the SERV and Traction light on as soon as the car starts up though, they never go out (was the same before I changed the switch). Then, as soon as I start moving, the ABS comes on too. Although this morning after initially moving off, I reversed back and ABS light then went out.

So the ABS light is intermittent, and goes out everytime car is turned off and started again. SERV and traction are always there.

Thinking it could be an ABS sensor. I have two new driveshafts to be fitted soon, and new rear discs too, so that would be new ABS rings all around at least, just leaving a sensor then.

I purchased an iCarSoft diagnostic reader yesterday so when that arrives am going to plug it in to read the fault codes.

The only slight positive is I will now have another 6 months on the MOT under the new extension they are rolling out, so no immediate rush to sort it.
 

MarcB

ClioSport Club Member
  Too Many
Make sure your diagnostic does ABS / Airbag as some don't have the module and only do engine management.

If you are friendly with someone in a garage who has a good snap-on or Autel diagnostic tool they will pin point it to what wheel is causing the problem.

Even better if you know or have anyone around using Renault CAN Clip

Im betting its either ABS ring or sensor , You can check the rings if you want to get wet and dirty rolling around the floor. A split / cracked ring will be visible and it will help you pinpoint the issue.
 
  2005 Fabia Vrs
Have a visual check of the wires for the sensors. My old 172 had this and it was a broken wire to the sensor on the drivers front wheel. 30 minutes with a drill and new one cured it all.
 

Daz...

ClioSport Club Member
  Clio 182 Cup
Mine had a cracked ring and never threw up any faults. It did kick the abs in under 30mph though.
 


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