05 sentra has two codes P1138 and P1446, what is a rough estimate on the repairs for those codes?

Question

what causes those codes to happen?

Answer 1

There is a service bulletin to reprogram the ecm when you have the 1138 code. This usually will cost about 1 hour labor at the dealer.

The 1446 code is for the vent control valve. This is attached to the charcoal canister. The valve is the most common failure. This usually runs about $250 for the parts and the labor to have it installed.