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When I check the system with a scanner at my local mechanic the code that appears is PO420. This car has a 3.1 v6 with automatic transmission. If anyone has encountered the same problem please e-mail any suggestions to correct the problem. Thank you and may you have a Blessed Day.
this problem occurs all the time,the system switches from normal to defrost and back to normal when the fuel petal is released and engine is not being accelerated. I replaced two check valves in vacuum system but still have same problem. Any help will be appreciated. Thank you.