For no good reason and nothing changing the car fired right up this morning. No idea why it did that. Does the key mate to the car and could that be getting bad? If so, I assume I should try the other key if it happens agian?

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1996 E300D
1996 E320 Wagon 4MATIC
2003 Jetta TDI- GLS, 5-spd
1997 Passat TDI
2002 F350 Crew cab 4x4 Powerstroke
Jacobsen HR 15' cut ZTR w/ 80 HP Perkins diesel
Hustler 6' front deck with 28HP Kubota diesel