Need help vith ABS

I have a 2007 Volvo with D12 engine. Recently my ABS light came ON and also Stability Controle light is ON. I read codes and basicaly it says: Third achsle left ABS mechanical problem and says signal ERRATIC. These codes I cannot delete. I do get other codes (ABS problem with unknown reason) on all other wheels. These codes I was able to delete so far. Just to mention, I replaced ABS sensor on 3rd achsle left hoping that would solve the problem but it didn't. My question is (mostly for Pablo, he is a champion of knowledge here) is there possibly a help without going to dealers?
P.S. I also forgot to mention that I bought this truck brand new and it happened to me 2-3 years ago twice that all gauges went OFF while driving for a few seconds and they would come back. Maybe there is a connection??? .....and no, I don't have any codes right now...

 

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