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9400 is the brake pedal switch - and often just that switch.
400c is the evaporative emissions system - often a gas cap that isn't screwed on tight, but it could be a leaky hose, or emissions pump etc.
928c is the steering wheen control module - either you need to replace that, or it's the power steering module.
720A is the immobilizer and means that the computer doesn't see or get the right code from the immobilizer. I believe this is the unit that senses that you have the right key inserted before starting.
E003 is usually a DIM (driver information module) fault, basically a problem with the cluster. A software reload for that might fix it, or replacement of the instrument cluster.
If all of these errors happened at the same time, I would say that the ECM has the hiccups. You can either find the ECM fuse inside the driver side door fuse box (open door, open lid to fuse box, remove fuse... 25? there's a diagram on the lid).
Otherwise remove the negative battery cable in the trunk for an hour or so and then turn the ignition to Pos II and then reconnect it. That should clear the brain.
P2189: Sys Too Lean at Idle Bank2 P2187: Sys Too Lean at Idle Bank1
The other codes P2189PD & P2187PD are pending codes.. Meaning the car will have to recheck the errors before it calls it an error and sets the engine light on. They are the same codes as the others just the PD at the end means pending.
if you look that up on a normal OBD code its listed as P1604 Code Word Unregestered However for a volvo thats a code for Control Module Self Test, Speed Monitoring which would indicate the ECM or a wiring problem ( usually just a loose connection,, so check the connections on the ECM, which you can have scanned by the dealer, Volvo codes vary from the normal coding on most cars, so be careful when getting codes and their meanings