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"ABS failure" and "PSM failure" warnings

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I found the pressure switch, it is a BOSCH 0265005303 Brake Fluid Pressure Sensor ESP and very easy to change.


Undo the wiring harness clip, push a deep 24mm socket over the switch and undo it. Doesn't even need bleeding afterwards - 5 min job from start to finish, including clearing the codes with Durametric.


Hope this helps someone else out there to avoid replacing a perfectly good $3.5k pump for the sake of a $150 switch.


I cleared the codes, drove for a day then the fault has reappeared, with error:

Porsche fault code 364 - Stop light switch Signal implausible


Seeing as I have cleaned the MAF, checked all the brake lights, replaced the clutch switch (twice), brake switch (3 times) and ignition switches, replaced the pressure sensor on the ABS, I am not sure where to go next.


I bought a used ABS pump with PSM from a 2004 996, but the part number is slightly different: 996.355.755.62
(my car is 996.355.755.52), could this be an issue if I fitted it?

Edited by SpawnyWhippet
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