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I don't inow about those exact codes - but my car threw a check engine light and was hissing. it was a vacuum leak.
after i got it fixed and drove it a few hours - it drove much better. i had thought my car was losing power - after the vacuum leak was fixed - it ran much better.
there was a noticeable gaini n hp/torque after the leak was fixed.
my hissing noise sounde like an inner tube with a leak and then you rubbed water on it - that hissing/bubbling sound... at least that is how it sounded. total cost to repair at an indpenenent - parts/labor - $250.
hope that's what is it as it was a cheap/quick fix!
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