If you are suffering intermittent Amigos it is a good chance your front sensor cables have fractured due to age or mileage or steering movement, whatever, I reckon around 150K is the top limit before the 3 Amigos problems start.

Another issue seems to be the actual shuttle valves leaking brake fluid into the shuttle valve switches. There is no easy fix for this, it's a modulator removal job and replace the shuttle valve seals and clips (it's best to do one side at a time so not to mix the parts up). Unfortunately then you need to do a FULL power brake bleed for which you'll need a diag tool or access to one or a main dealership Test Book.

Doing Option B is only the first part of the process but sooner or later the seals will start to leak or the front sensor cables will fracture and the hunt is on once again.

For the seals Google Falconworks in the US.

https://www.jewellamberoil.com/sales...87n12bqobnefl6

 

 

Yep, ABS Sensors (wheel speed). Here have a look >

 

 

Yep, it's the wheel speed sensors I'm referring to, the cables fracture due to time or damage (especially front wheel wobbles) and very often give an intermittent 3 Amigos. So then you clear the DTC codes and everything seems fine for a short white, then the dreaded dong, dong, dong and they're back. If the wheel bearing is good then just replace the offending sensor, it's a 1 hour job max.

 

 

The cable comes integral with the sensor. You could try a sensor from the parts D2 but there are no guarantees of good results. Ensure you use the same sensor as the equivalent on the D2 as the cable lengths are different.

I have always used the plug together sensors although in the US they prefer taking the cable right back to the SLABS unit. When joining them I always use electrical cleaner spray.

To check the wheel bearing, jack up the front wheels onto axle stands only by a few millimetres off the floor and spin the wheels whilst listening for 'strange' bearing noises. Then try to move the wheel gripping at the top and bottom approx, if there's no movement the bearings should be good. (the best tool for listening is an engineers stethoscope)

 

 

I never got the amigos on mine, but I did get a persistent wheel speed sensor fault and the enigmatic "rough road signal implausible" OBD2 error. Replacing the hub with its sensor in place god rid of the problem permanently. So remember that wheel sensors and wiring issues can cause more than just the 3 amigos to show up.

 

Just performed Option B on my 500.00 03 D2. Funny thing was when I went to remove the old Shuttle Valve switch assembly I found the yellow/green wire had been tapped into previously..... I also found the 3 allen head bolts that hold the Shuttle Valve Switch loose and I even found one completely out just laying there... I also found evidence of someone having a ground wire twisted around the bolt that secures the HVAC line to the fender/wing.


Dunno if someone freaked out a the simple Option B install or a Dealership removed it and installed another WABCO unit????? The date code was 2003 so I seriously doubt it was replaced.



Installed my modified Shuttle Valve Switch (used but tested good from my 04 that I replaced with a new one a while back along with Option B). Finished up Option B, reset the Shuttle Valve/Ground faults and bingo I now have a 500.00 03 D2 without a single OBDII fault code!