ABS light is on. ABS is not working due to codes C1175, C1236. Codes are for a problem with no signell from the left rear wheel sensor. Any advice would be apreciated

Using a Torx E8 socket, remove the left rear ABS wheel speed sensor mounting bolt, located on the back of the drum. Clean the sensor with brake cleaner and a rag. Alternatively, remove the left rear brake drum. Check for excess brake dust on the ABS sensor and clean with brake cleaner. The ABS sensors on each wheel should be cleaned every two years.