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Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
Whst is the code please?
I thought that would be the code, hence the example I gave above.
P0404 is EGR performance, a very common code for jamming EGR valves in many diesel vehicles. Best option is replacing the valve assembly.
If the valve is partly off its seat, you get low power.
About $300 US would be average repair cost.
Hope this helps.