For those Sentra owners having a code P1138 coming up on the "check engine" light, it's a swirl control valve. The code came up on my Sentra 03 in 2010 but I erased it before I can take it to the dealer. I've read in the forum that it is a part of the emission and it is warranted for 15 years/150,000 miles. So when the code came up again 2 weeks ago I took it to the dealer and talk to one of their service rep. The service rep was so helpful that he did his own research, looking at the VIN number my car was covered, at the same time the rep also found a bulletin about the electric fuel pump and it was also under warranty. So the swirl control valve and fuel pump were replaced. I did not pay anything, even the diagnostic. By the way the 15 years/150,000 miles is a California emission warranty. I don't know about other states. Check with your dealer.
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