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Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4571
Experience:  Fully qualified / self employed garage technician in the UK
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Why does my abs warning light keep coming on intermitently

Resolved Question:

why does my abs warning light keep coming on intermitently when diagnostics reveal no problem ?
Submitted: 2 years ago.
Category: Car
Expert:  Robert replied 2 years ago.


Has the diagnostic testing been done when the ABS warning is on?

What other checks have been carried out bar the testing as above?

Customer: replied 2 years ago.

yes the light was on .no, no other tests have ben carried out

Expert:  Robert replied 2 years ago.

The reason maybe surrounding why you dont get anywhere with the 2 diagnostic trials you had already done was maybe because the ABS light wasnt on at the each ignition cycle the abs does a self test - if it passes then the abs light goes out - if during driving the abs light comes on then it detected a fault and stored the relevent fault code as to wahts gone wrong on the system - of course if you turn off and start up again this could reset the fault memory until the fault reoccurs again - ideally you need to have the ABS light on to be able to diagnose where checks need to be of course this depends on the scanner itself so a high end scanner should be able to to get those codes..typical areas that need checked is are the multiplug pins are clean at the abs module just incase the pins maybe corroded slightly.some electrical contact cleaner into it and let it dry then refit just incase...the abs cables or sensors would likely be the best place to start.but you really need to know what the fault codes are before knowing which sensor to check or replace even..but before hand you could inspect the cables and the plug connectors on them all the same..also make an inspection of the trigger/target ring on the inner cv housing as it enters the hub..this is what the abs sensor monitors - so if the ring is cracked or lost teeth or heavily corroded then that too can cause the abs light to flag up in regards ***** ***** signal.if corroded then just spray brake cleaner all the way round the ring and fine wire brush to clean anything else off and see if that again those have to be checked..but ideally you need to find someone locally who can actually interogate the abs module/monitor the system on live data whilst the cars driven or even to pull the codes and see whats being logged provided the ABS light is on at the time of scanning..I do hope this helps
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