In multi-hop wireless sensor network faulty link detection plays an important role in network connectivity and management. Faulty link may impact the performance of network. To maintain a network quality, WSN should detect the fault in network and able to take appropriate action. Existing scheme link Scanner for wireless link collects hop counts of received probe messages at sensor nodes. If a link is faulty there is mismatch between received hop counts and network topology. A new approach is based on the path mismatch along with the hop count mismatch. This proposed approach makes the use of previous hop count mismatch to detect the change in path. The scenario also use the link quality metric ETX to detect the links failure in order to reroute the packet. Proposed approach will be able to detect the link failure in robust and efficient way.