citroen key fob replacement Dispatching Remote Key replacement key for citroen berlingo van citroen berlingo replacement key cost cars prior to 1997 had keys without transponders. The keys can be programmed with no any special equipment available on-site. If your key fob isn't working it could be down to a few different causes such as worn buttons or battery contacts not making contact and water damage to the receiver module, or key issues. Diagnostics of a fault Fault diagnosis is a process that pinpoints the source of a problem, so that corrective actions can be implemented. It is usually referred to by the term fault isolation and is a critical component of the automation systems for operations management. It consists of three steps that include detection, localization and estimation. Typical methods for fault diagnosis utilize simulation to find the possible responses to tests when there are various faults, and then save the expected results in databases.