Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
Looks like you covered most problem areas .
Was all parts you replaced New and OEM parts .
Check the following .
Fuel pressure .
Replace the PCV valve (typical for P0174.)
I think you may have a problem with a leak on the exhaust ,now this is a hard to find issue you may not hear
the exhaust leak to block up the pipe and check up front around the header and before the sensor .
And a bad spark plug coil ,could also cause you this issue.
Please check this then get back to me if needed.
The MAF sensor or a leak just after the MAF would normally be the problem to have both codes but then fuel trim would be bad.
All i can think of now is possible fuel pressure low for both banks to be running lean. If pressure is also good and all systems are good then i would be checking at the dealer if a ECM reflash would sort out this problem .
Do you have any drivability issue ..