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Old 05-26-2012, 04:10 PM   #39
ryannel2003
Registered User
 
Join Date: Apr 2012
Location: New Bern, NC
Posts: 973
My Ride: '04 Cadillac Deville
My car has been throwing P1421 the past week or so. I cleared it last week and put about 500 miles on the car and it didn't come back on until today. I just bought my can of seafoam and will be doing this treatment later on tonight when the car is cold. I already replaced my hose because it had a large hole in it, so we'll see if this does anything.
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