A plurality of wireless sensors can be placed within a large system in various locations to monitor critical elements of that system. Each wireless sensor can include sensor elements usable to monitor one or more parameters of an element of the system and a wireless signal transmitter, such as, for example, a speaker or an antenna. Each sensor can transmit one or more unique identifying signals to a signal-receiving device, which can be processed by a signal processor. The signal processor can determine each received signal, the sensor corresponding to that identified signal, and the time the wireless signal was generated. Based on this information, the wireless signals can be diagnostically compared against expected values for the system being monitored and evaluated. If a discrepancy is detected, then the components and/or subsystems within the system that are implicated in the discrepant wireless signals can be evaluated for possible errors.