Warning lights on but no fault codes

[katabrontes]

From time to time three of the warning lights ( brakes, VSC & ABS) fail to go out when the engine starts.  Occasionally they will come on while driving.  If I restart the engine they go out and stay out.  I can't get any fault codes on my reader and neither could my local garage (not Lexus) with a more sophisticated system on a laptop. The car drives normally and there is no indication that anything is wrong.

Any ideas would be appreciated.

[NemesisUK]

Failing/faulty wheel ABS sensor?

How good is your Battery, low charge can cause various glitches.

[katabrontes]

Thanks for the idea.  Battery is new.  Wouldn't a faulty wheel sensor trigger a fault code?  I have checked for codes both while the lights were still on and after they had reset and there were none in both cases.

[Delphius1]

All the systems showing the fault use the ABS sensors so the likelyhood is that one of the ABS wheel sensors is intermittently faulty.

A decent professional scanner should pick up any saved fault codes on the ABS system at the very least though. Very strange.

If the fault is intermittent it goes away so by switching the engine off and then on again the lights go out, but come on when the fault resurfaces.

 

 

[katabrontes]

Thanks for this idea Delphius.  I will get my garage to check the sensors.  I suppose it might just be a dirty connection as it's intermittent often happens when it's raining.