Thread: P0303 Code
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Old 10-31-2015, 11:37 PM   #5
MarylandSpeed
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Drives: 2012 ZL1 & 2010 2SS/RS
Join Date: Jul 2009
Location: Maryland
Posts: 3,378
If you did not remove the plugs when doing the header install, one could be cracked. Same if you removed them, you could have dropped one. Whenever I see this after a header install it is the first thing I think of.
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