Steve

Code 32 is one of the two knock sensors and/or circuit.

I suspect the harness plug/s has not been snapped into the locked position on one or the two knock sensors due to difficulty with access under the inlet manifold.
The ignition is probably being retarded by the ECU as a result of the open circuit.

I doubt your car has EGR as my UK spec E320 Coupe 1995 does not.

Regards