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If it was just the ABS light, I would say fuse.. But the fact that it's on with the brake warning light points toward the rear diff sensor. Are you having speedometer issues as well?
 

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300 means misfires detected in multiple cylinders. 301, 303, and 305 show that the misfire is in cylinders 1,3, and 5. 138 is a malfunction in the driver's side front O2 sensor (high output voltage). It's pretty much a guarantee that this is responsible for the misfire codes.

Unfortunately none of these point to your original problem though. But replace all of your O2 sensors now.
 
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