My 2003 F150 4X4 4.6 has the PO171 & PO174 cp codes.
Let me mention the truck is running great with the Check Engine Light on.
It's hard to tell if my milage has gotten worst with out doing the math, after all when I drove it off the lot I was getting 10 miles to the gallon, but after running full Synthetic Oil, got it closer to 12 (Funny huh)
After much reading, the first thing I did was removed the MAF and spray cleaned it (30 seconds of spraying) . I used a can of Mass Air Flow cleaner. Also new air cleaner installed.
Erased codes, drove 30 miles, same 2 codes are back.
Checked all hoses for vacume leaks, all look / feel good.
WWWellll, now I,m going for the 4 Oxygen Sensors.
Read many replies to posts made about these 2 codes and some of the (Top Gun Mechanics) write, " you wont get those codes (Bank 1 & 2 running lean ) and solve it with replacing the Up Sream (and/or) Down Stream Sensors.
It,s a bee-och replacing the o2 sensors (Up or Down stream), not to mention the $205 for the sensors and special 7/8 socket (which is definitly needed for replacing the down stream sensors).
I will let all know what the out come is! Any and all opinions appreciated.....
Let me mention the truck is running great with the Check Engine Light on.
It's hard to tell if my milage has gotten worst with out doing the math, after all when I drove it off the lot I was getting 10 miles to the gallon, but after running full Synthetic Oil, got it closer to 12 (Funny huh)
After much reading, the first thing I did was removed the MAF and spray cleaned it (30 seconds of spraying) . I used a can of Mass Air Flow cleaner. Also new air cleaner installed.
Erased codes, drove 30 miles, same 2 codes are back.
Checked all hoses for vacume leaks, all look / feel good.
WWWellll, now I,m going for the 4 Oxygen Sensors.
Read many replies to posts made about these 2 codes and some of the (Top Gun Mechanics) write, " you wont get those codes (Bank 1 & 2 running lean ) and solve it with replacing the Up Sream (and/or) Down Stream Sensors.
It,s a bee-och replacing the o2 sensors (Up or Down stream), not to mention the $205 for the sensors and special 7/8 socket (which is definitly needed for replacing the down stream sensors).
I will let all know what the out come is! Any and all opinions appreciated.....