First off, are these fuel trim readings at idle or while driving? But the -17 indicates that you are running rich, -25% is max and ideally you want to be close to 0% at all times. You mentioned that you were losing fuel pressure with the key on and the engine off. Leaky injectors could cause you to run rich for sure but there are many other possibilities as well. Your fuel pressure shouldn't be decreasing like that and I would start troubleshooting that first. I agree with what you said about it affecting both banks but you never know you might have more then one leaky injector. Currently I am dealing with running lean in my truck (+25% fuel trims) so i have been doing a lot of research on fuel trims haha.
I would look up the codes PO172 and PO175 and take a look at the common causes. I don't believe these codes would come on until you hit the max of -25% but you are getting close and the same would apply.
I would look up the codes PO172 and PO175 and take a look at the common causes. I don't believe these codes would come on until you hit the max of -25% but you are getting close and the same would apply.
