avtonomb Posted March 27, 2012 Report Share Posted March 27, 2012 As many know, p0300 is random/multiple misfires and p0420 is catalyst efficiency below threshold drivers side. Any way I got the truck checked out and the mechanic says the drivers side cat was dead. That's fine it's still under warranty. Then he told me that the reason I have the p0300 is because I have a leak in my intake manifold??? He did say it was running lean at idle for some reason . Do our trucks have a problem with leaking manifolds? Any body hear something like this before? I have extended warranty on the truck, I just don't want the mechanic to take advantage of me. Truck runs fine so idk. What do you guys think? 2005 SSS 65k miles, magnaflow cat back, volant, Wheatley Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted March 28, 2012 Report Share Posted March 28, 2012 The P0300 can be related to the bad cat, get the cat replaced and that code shouldn't come back.... Quote Link to comment Share on other sites More sharing options...
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