help with cel code 5 please

natt2000

New Member
my 91 integra is getting a check engine light and throwing code 5. it is smoking out the exhaust when i press the gas. code 5 is a map sensor. what im wondering is:
1. why is code 3 also a map sensor code?
2.where can i get the map hose?
3.where can i get a map sensor for under $250
4.why do they cost so damn much T_T

im just going to replace the hose before the entire unit
 
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