If the car has not been for a routine full check up on the clocked mileage , I think it is only a possible clean up of all the wheels, the sensors that can help to eliminate this problem.
The other probable suspect can be the ABS itself acting erractic at times when there is a false sensing.Make sure all the wire lines to the sensors are good and tight.
Since the fault is turning up only at times, replacement with a suspicion is not a good solution as you might unnecessarily waste money for replacing good working spares.
So attempt the check up once again as you had done and observe the next time the fault occurs. Jack up all the wheels and check the brakes/ bearings once again.
Is it wet in your part of the world right now? This does happen from time to time if water gets into the system. The fix is to go to the wheels and any sensor on or near the brakes, disconnect (if possible) and fill with "di-electric grease" which will keep the water out and the system working good.
Getting any kind of blockage (dirt, mud, trash on the highway) between the exciter ring and the sensor will kick this issue. And only momentarily. The thunk you may be hearing is from the traction control kicking in automatically to give you stability in what it believes to be a slippery situation.
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This problem is hard to diagnose without seeing the vehicle. If you take the vehicle to the repair shop they will be able to put it on their scanner to see what the codes where when the light came on. This will give you a lot better idea of what the problem is.
Sounds like you have a faulty ABS module, only way to verify is to take it into your Honda/Acura dealership as they have very in-depth scan tools that you won't find anywhere else! Good luck!
Please see my tip at http://www.fixya.com/cars/r6003525-abs_traction_control_lights . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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VSA light comes on after a big thunk sound. I know ABS and VSA both use wheel speed sensor. If the ABS and VSA have both been affected - doesn't that point to the sensors? Is there a way to find intermittent failures of any of the above?
I don't think water is it. Each day was very dry, and overall the 6 weeks we have been in a severe drought. Thanks for the try though.
I'll get the codes read tomorrow.
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