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tommylawn 05-26-2006, 08:08 PM I have an 05 GMC Duramax with a TrueFlow intake, 4" MBRP CatBack, But I cut out the Cat, and I just put in a Hypertech on stage 2 and I am getting P0401, P0404, and P1626 I found out what they are I am just wondering what I should do now, kinda new to this whole thing. any help is greatly appreciated Thank you Twistedsteel 05-26-2006, 11:27 PM Well you can buy a code reader and they usually clear codes also. That will get rid of the cel. If you don't want to buy one autozone will read and clear them for you for free. But they will probably keep coming back. You need to get a fingerstick and you might as well get the egr blocker while your at it. The fingerstick will eliminate some of your problems. They are both sold by one of the vendors here Kennedy I believe. Do a search and you will find gobs of info. Later ChevyWolf 05-27-2006, 12:22 AM P0401 and P0404, are caused by your removel of the cat and adding a freer flowing exhaust. As for P1626, Did that on start after you installed the Hypertech? briano 05-27-2006, 10:36 AM please read the FAQ at the top of the section. Scroll down to "what is a Finger Stick" tommylawn 05-29-2006, 11:22 AM ChevyWolf do they hurt anything or just dont worry about it tommylawn 05-29-2006, 11:22 AM oh and p1626 was their when I put it in ah64fixer 06-02-2006, 08:58 AM Where do you get the list of codes and what they mean? briano 06-02-2006, 09:03 AM Where do you get the list of codes and what they mean? the very first post in this section. briano 06-02-2006, 09:05 AM ChevyWolf do they hurt anything or just dont worry about it please read the FAQ at the top of the section. Scroll down to "what is a Finger Stick" did you read that yet? | ||