The code 6 is pointing towards a bad ETA (which could be just bad wiring for that harness). The bad news is ETAs are of course very expensive. The good news is it may just be a bad potentiometer on the ETA and the potentiometer for your ETA is replaceable for about $50. The bad news is the replacement potentiometers seem to be getting scarce - possibly a conspiracy to sell more ETAs. Are you getting any ASR lights?
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