Error Code 00493 ABS ESP sensor unit G419 Faulty

Au2ro

Au2ro

Member
I took the car into a local garage that had worked on the brakes recently for a service and mentioned intermittent ABS/brake warning lights coming on and a weird pulling on the steering wheel when accelerating. They diagnosed the error code 00493 and suggested ESP-Sensor Unit replacement but have not got the equipment to do it.

I found an old post about a similar fault giving the error Code 00493 ABS ESP sensor unit G419 Faulty

https://www.a2oc.net/community/index.php?threads/esp-control-module.12979/post-98914

Some advice there:-

Possible Solutions

* Adapt Steering Angle Sensor (G85)
* Check Wiring/Connectors from Brake Electronics (J104) to ESP-Sensor Unit (G419)
* Check Measuring Value Blocks (MVB)
* Replace ESP-Sensor Unit (G419)

I have had the wiring for the brake electronics fixed before and it was suggested that I might need the loom replacing at some point after getting ABS warning lights before the wiring was fixed. Also I just recently replaced the brake wear indicator wire connector.

I'm just coming up to 200,000 mile mark and do want to keep the car running for some time yet if possible but this could be costly.

But having limited knowledge and not trusting a dealer/specialist garage not to just do an expensive ESP-Sensor Unit replacement does anyone have any further advice about how to go about getting this fixed?
 
OK, so the warning lights came on only twice this week, strangely exactly the same place in my travel back from work that I last remember them coming on before - stopping at traffic lights a few miles away from home after 20 or so miles drive. They only seem to come on, on stopping, after applying the brakes.
Once they come on they stay on even after stopping and re-starting the engine, which I did at the traffic lights, after the minute or two that it took the lights to change. It only seems to be after a longer period of time that the next time I switch the engine on the warning lights are gone.

brake warninglights-small.jpg

I also experienced the traction control coming on when rapidly pulling out of a junction on a wet slippery road, so that, at least, seems to be working still.

First (cheapest) things first:-
Due to the OP on this thread saying that a faulty brake light switch could be the cause of ABS and Traction control warning lights coming on together which I was getting, and the fact that I was also getting an intermittent bulb warning light when pressing the brake pedal, I have now replaced the brake light switch. We will see what happens next week...

On trying to remove the light switch from the dashboard I accidentally pulled the trim around the switch off before pushing the light switch in and twisting it to clockwise to remove it from the barrel correctly. In trying to get the trim back over the light switch I managed to remove quite a bit of the black paint from the surface of the switch. What is the best kind of paint to touch up the now ugly white plastic?
 
Hi,

Just something to try that is quick and costs nothing.

I notice you said you have been working on the brake pad wear warning wire connector. As you will know just upstream of this it joins the abs sensor wire in a y-junction and becomes one 4 core cable. When working on the connector I imagine you must have to some extent stressed the y-junction, maybe leading to your intermittant problem. In addition the 4 core cable higher in the wheel arch is well known for discontinuities invoking the dash pad warning and as it is the same cable it makes sense to me the same will be true for the abs cores My suggestion, with the ignition on, just give the wheel arch cable a gentle wriggle and see if it invokes the dash abs warning.

Andy
 
Hi, just to let you know, that I too had this problem about 6 months ago. The ESP warning light triggered when I went over some pot holes. After a day it went out. It did this a few times before a rather large pothole made it permanently stay on. I started the investigation by checking each ABS sensor using VCDS. also checked steering angle which all came back OK. In the end I purchased a spare ESP sensor and fitted this. It actually turned out to be a fairly straight forward fix. You need to remove the drivers side and passengers side kick panels (remove front mats and carpet first) and the ESP sensor is located in the centre console directly underneath the ashtray (as a guide reference). Its protected by a several foam inserts and is secured by two 10mm nuts. Its fed by 4 pin connector which you can remove, before uninstalling the unit.
 
Haven't had to calibrate. I suspect if it was the G85 that was faulty, you would need to calibrate the steering using the learn procedure

Sent from my Moto G (4) using Tapatalk
 
Warning lights came on yesterday at exactly the same spot, braking before the traffic lights again.
They also came on this morning after a short run and back to the car park where I was going round slowly looking for a space.
I will be looking at the cabling next.
 
It was not until I put my winter wheels on and noticed that one of my summer wheels had a lumpy tyre on it that the issue went away.
Coincidence????
 
It's baaack. :(

It only comes on at the exact same spot on my drive home that it did before.
I wonder if I have got a lumpy winter tyre now?
I have not yet put my summer wheels back on, with one brand new tyre, but might this weekend to see if that makes any difference.
 
Well, this is still happening and with more frequency now. I wonder if it has anything to do with the weather?
It hardly happened at all during the winter and I have changed the summer tyre and used the winter tyres again recently due to having my summer wheels refurbished.
Honestly, I think that it only happens during warm weather and happening with greater frequency when its hot.
 
This is now happening on startup quite frequently. I can turn the key to the off position and when I see that the ABS light does not come on, on turning the key back on before starting the car, I know that the lights are not going to come on immediately after starting to drive.
It still only happens intermittently when after driving for some time I come to a stop.
 
Au2ro said:
This is now happening on startup quite frequently. I can turn the key to the off position and when I see that the ABS light does not come on, on turning the key back on before starting the car, I know that the lights are not going to come on immediately after starting to drive.
It still only happens intermittently when after driving for some time I come to a stop.
Click to expand...
You really need a VCDS scan. Maybe some Scottish member who has the kit can help you out.

Andy
 
Andrew said:
You really need a VCDS scan. Maybe some Scottish member who has the kit can help you out.

Andy
Click to expand...
I do have VCDS-Lite
But I get:-
"Address 03: ABS Brakes Labels: 045-906-019-AMF.LBL
Controller:
Note: Can't Synch Baud Rate"

I should be seeing timmus soon so will likely get a proper scan from him and advice on how to fix the ABS issue. Also maybe advice on how to get rid of the 'Can't Synch Baud Rate' error
 
Rosstech Wiki says:

"... If when you try to connect to a control module, you get the error message "Can't Synch Baud Rate", go to the Options Screen and try setting the Start Baud to 9600. If 9600 doesn't work, also try 4800 and 1200. Turn the car's ignition OFF and in back ON after each failed attempt to connect! ... "

Allways worth a look there, or just copy and paste your query into Google. Mac.
 
PlasticMac said:
Rosstech Wiki says:

"... If when you try to connect to a control module, you get the error message "Can't Synch Baud Rate", go to the Options Screen and try setting the Start Baud to 9600. If 9600 doesn't work, also try 4800 and 1200. Turn the car's ignition OFF and in back ON after each failed attempt to connect! ... "

Allways worth a look there, or just copy and paste your query into Google. Mac.
Click to expand...
Thanks, I thought that I had tried this already, but that might have been before I got any connection. I shall try it again and see if it works this time.
 
I still get "Can't Synch Baud Rate" to clear whatever starting baud rate I try.

Timmus has now scanned the car and errors are coming from the drivers side and timmus has suggested what to try.

Changing the spliced cabling so the splice is in the engine compartment is the first thing I will try.

The car also needs at least one front bearing done on the passenger side so I will probably get both done and change the sensors as well.

If none of this works timmus says that he could calibrate after replacing the ESP-Sensor Unit.
 
I am not sure what all the codes were that timmus found but now that the sensor cabling has been stripped back to good clean copper in the engine bay and the replacement wires wrapped in self annealing tape then covered with "spray tape" that dries to a rubbery coating and the error codes cleared I am back to just the error:-

1 Fault Found:
00493 - ESP-Sensor Unit (G419)
014 - Defective - Intermittent

(found with VCDS Light running on a windows 10 laptop with the same cable that I used with the Linux netbook.)
The lights only coming on at the same place on my drive home (and one other place with a similar long slope down before coming to a halt).
After the long deceleration and stop the lights come on after taking my foot of the brake pedal.

Next...
 
Lots of ESP Sensor Unit G419 1K0907655A/1K0907655B/1K0907655BC on eBay for under £20 If they're the correct part it might be worth a shot just replacing it but no way to tell if the part is any good or not before fitting it.
 
I had a look at the ESP Sensor Unit G419 but I could not read the part number so I took it out...
It is a 7E0907655A
esp_sensor_unit.jpg
 
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