Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
You probably won't get many replies without including some more information.
What year is the car?
What is the code description for p0698?
What market? (I don't think there's a North American version of that car with a diesel engine).
What are the symptoms?
What tests have you done?
Please understand I'm only trying to give you advice to get the best results from the community. I am not trying to belittle you or your post.