I've been googling and searching the forums for any similar issues but having a hard time finding anything definitive. I recently decided to replace my spark plugs and fuel injectors as preventative maintenance (mistake lol). Trying to start it up killed my starter (fun one to replace) and now that is fixed I'm getting p0171 and p0174 and very low fuel economy. I checked my MAF and the sensor section was coming apart so I ordered a new one and replaced it.

After reseting the code and driving for a bit I'm still getting the same error codes and bad fuel economy. Any ideas what I should check? I have an icarsoft scanner so I'm able to check a few things but not seeing anything obvious at the moment.

https://www.fcpeuro.com/products/mer...h-0280156016kt These are the fuel injectors I used to replace my old ones.

did you ever fin out the problem currently having same problem on my 10 e550 I sprayed the bottom of my car off to get rid of dirt and grime and oil after I drove to gas station and refilled on gas 10 minutes later the same codes popped up I’ve seen forums where O2 sensors are bad

I got the wrong injectors. Some sites will say “these fit your car” but do some more research and make sure you get the exact ones for your car.