The 332 is due to a problem with either the flow of EGR gases or the sensing of same. Usually either a clogged EGR port on the intake, DPFE sensor, or sensor hoses.
The 2.5 does indeed have a knock sensor. This code often appears when the trottle is not goosed hard enough during the goose test. If you do not hear knocking or pinging under acceleration, it probably is not worth worrying about.
Steve
