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Discussion Starter · #1 ·
Dealer reflashed my truck, since then check engine light has came on. Same p0420 code as always. If one was to pull the fuse or unhook the battery next time light comes on. Do you lose the relfash? Does it go back to first settings?

thanks guys.
 

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No, you don't lose the flash. The computer just resets to the base parameters.
 

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Mazz said:
No, you don't lose the flash. The computer just resets to the base parameters.
What he said... ;)
 
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