LEGO Harry Potter: Years 1-4 (Nintendo Wii)

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Cheat Mode

After the Leaky Cauldron hub area is unlocked, enter Wiseacres Wizarding Supplies in Diagon Alley. Go upstairs and talk to the vendor, then enter one of the following passwords to activate the corresponding cheat function.

EffectCode
Spells 
AccioVE9VV7
AnteoculatiaQFB6NR
Calvorio6DNR6L
Colovaria9GJ442
Engorgio SkullusCD4JLX
EntomorphisMYN3NB
FlipendoND2L7W
GlaciusERA9DR
HerbiforsH8FTHL
IncarcerousYEB9Q9
Locomotor Mortis2M2XJ6
MulticorforsJK6QRM
Redactum SkullusUW8LRH
Rictusempra2UCA3M
Slugulus EructoU6EE8X
StupefyUWDJ4Y
TarentallegraKWWQ44
Trip JinxYZNRF6
Bricks 
Gold Brick 1QE4VC7
Gold Brick 2FY8H97
Gold Brick 33MQT4P
Gold Brick 4PQPM7Z
Gold Brick 5ZY2CPA
Gold Brick 63GMTP6
Gold Brick 7XY6VYZ
Gold Brick 8TUNC4W
Gold Brick 9EJ42Q6
Gold Brick 10GFJCV9
Gold Brick 11DZCY6G
Cheats 
Carrot WandsAUC8EH
Character StudsH27KGC
Character Token DetectorHA79V8
ChristmasT7PVVN
Disguise4DMK2R
Extra HeartsJ9U6Z9
Fall RescueZEX7MV
Fast DigZ9BFAD
Fast MagicFA3GQA
Gold Brick Detector84QNQN
Hogwarts Crest DetectorTTMC6D
Ice RinkF88VUW
InvincibilityQQWC6B
Red Brick Detector7AD7HE
Regenerate Hearts89ML2W
Score x10H8X69Y
Score x274YKR7
Score x4J3WHNK
Score x6XK9ANE
Score x8HUFV2H
SilhouttesHZBVX7
Singing MandrakeBMEU6X
Stud Magnet67FKWZ

Christmas in July

If you purchase and use the "Christmas" extra, the room you use it in will keep playing the same music for the rest of the game... Just like the red-haired Ron cheat, it will not revert back to its regular music.

Quick Coins

Find, post and purchase the "Collect Ghost Studs" extra. The parcel was either in Harry's bedroom or on the courtyard fountain (You will need to have learned the Leviosa spell first). Once activated the Ghost Studs are worth 1,000 each. "Get lost" the ghost will return to you and lay more studs -- it's easy money. A full trip from the Dorm to the Great Hall is worth about 100,000.

Red Haired Ron

After completing the first two levels of the game, you should have enough LEGO Pieces access this Easter Egg. Go into the wizard town through the Leaky Cauldron, the last shop on the left (before the bank), sells custom spells. Purchase the spell called 'Multicorfors'(a spell that turns the characters into "gingers"). Cast it on Ron Weasley. Once cast, he will shake his head as if it has worn off, but his hair will not revert back to its natural color.

Red Sparkles

In order to do away with the objects with red sparkles around them you have to use dark magic. In order to use dark magic you need to use the Polyjuice Potion (or use an evil character on freeplay -- e.g. Lord Voldemort, Tom Riddle or Barty Crouch Jr.). Evil characters' Wingardium Leviosa spell is changed to the Crucio curse (but works just the same as Leviosa) and can now destroy the red sparkly objects.

Unlimited Ghost Studs

Whenever Nearly Headless Nick is floating still (and you have the Ghost Stud extra on), stand under him and he'll constantly give you ghost studs.