A method for controlling an engine during sensor degradation uses a remaining active sensor. The engine has an exhaust gas recirculation system utilizing pressure sensors upstream and downstream of an orifice. The downstream pressure sensor is coupled to the engine intake manifold and is also used for...http://www.google.com.au/patents/US6659095?utm_source=gb-gplus-sharePatent US6659095 - Diagnosis system for upstream gauge sensor, downstream absolute pressure sensor
