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The answer to that question varies depending on which engine your Santa Fe is equipped with. The choices for the 2004 model year are L4-2.4L, V6-2.7L and V6-3.5L. This is "have-to know" information if you are wanting someone to help you with your vehicle. It will not affect the location of the sensor you are asking about, but in many cases, you should also mention if it is automatic or standard transmission and whether it is 2-wheel or 4-wheel drive. This affects MANY things like brakes, steering components, suspension components, electrical diagrams, etc. It is also impossible in some cases to look things up like Technical Service Bulletins and recalls without this information....just so you know. :)
P0446 means there is a higher than expected amount of vacuum in the fuel
tank when purge is commanded. This can be caused by a canister close
valve being stuck closed, but more likely, it is a restricted air inlet
filter at/near the charcoal canister.