My 2002 Suburban with the 5.3 L,flex fuel engine (Z) pulled a P0332 DTC today. The manual says that is the rear knock sensor. To get to the knock sensor, you have to take all of the fuel injection hardware as well as the intake manifold off. Before I do all that work, I want to ask if others have had this problem before and was it typically the sensor? Or was is a bad connection on the top of the sensor? Should I go for exact GM replacement? Finally, can I go a few days before I replace the knock sensor? With a malfunctioning knock sensor, will the engine computer permanently place the engine on retarded timing? Thanks.