My 70,000 mile 2003 Silverado 5.3 has had PO455, and PO449 issues for some time. My local shop suggested I go to a dealer for a smoke test to help identify the problem.
Since all the Chevrolet dealers within 20 miles have Closed, Today I tried the Buick, Pontiac, Gmc dealer nearby.
I mentioned at the service counter the fact that I have these two SES codes, and would like to have the smoke test done. I asked the price ( $ 84.00), I also asked if there would be an additional charge to read the codes ( No it's included in the $ 84.00)
Two hours and NO smoke test later, I was told that I need new intake gaskets, and an Oxygen sensor. ( Since I now have codes, P1133, PO131, PO171, PO455, PO 449, and PO300 )
They suggested that after I get the $ 850.00 intake gaskets, and the $ 325.00 oxygen sensor, that they clear the codes, and see what comes back on. For another $ 84.00
They also suggested that I might want to get a smoke test to check the PO455, PO449 ( after the intake gasket fix )
The intake gasket suggestion was based on the fact that GM has had intake gasket issues, and has developed a new improved part #
My question, Is this normal operating procedure at a GM dealer ? Or, did I just pick a Bad one ?
Any suggestions would be appreciated