MERCURY MARQUIS TROUBLE CODE

Code 21 Code 33 Code 18 Code 74 What Are These And What Do Do About Them?

Hello, I'm Not 100% That I Have A 4.6l Engine But Anyhow. I Received Two Error Codes And Cannot Figure Out What They Mean. I've Tried Just...

The Check Engine Light Is On, My Scanner Shows A Code Of P0430 Which Indicates A Possible Bad Catalytic Converter Or A Bad O2 Sensor. Don't...