ABS light was constantly on. Codes were C1145 C1234 and C1148. pulled the old sensor and measured resistance. Read open. The new sensor read 450 ohms, same as the working one on the driver side. Replaced the right front sensor and the codes and the light cleared. A few days later the light and exact same codes returned. The new sensor now reads open. There something hat could be causing these sensors to open without throwing any other codes? When I take voltage readings on the connector coming from the control unit with the key on, I get 0-3.5 VDC. since both sides read the same I assume this is the right voltage. Any thoughts? Thanks.