Where are MAF and O2 sensors? P1131, P0171 troubleshoot.
11-01-2005, 07:16 PM
#1
Thread Starter
Join Date: Nov 2005
Posts: 5
Where are MAF and O2 sensors? P1131, P0171 troubleshoot.
I have P1131 and P0171 Check Engine codes on my 98 Mustang (3.8). This is what I found out browsing around:
P1131 - Oxygen Sensor Lean *codes* A U
P0171 - Oxygen Sensor System Too Lean Fault Bank A
So, I decided to clean the IAC, MAF and O2 sensors. If that does'nt help, I am planning to replace the O2 sensors. Problem is, I am trying to figure out where the MAF and O2 sensors are located.
I noticed that in the air duct that connects from air filter to injector before IAC, there were two sensors.
This is the first sensor:
which I got from the area I have marked "1". Wonder what this is?
I think I have identified the IAC correctly.
At location "2" I found this:
Can someone kindly help me locate where the MAF and O2 sensors are?
Any kind of guidance appreciated. Thanks.
[IMG]local://upfiles/24082/74999B6A337341C1AAB8C1CDD1AFCAC1.jpg[/IMG]
[IMG]local://upfiles/24082/A6F01447051D4F0DB05E373337C7B3AB.jpg[/IMG]
[IMG]local://upfiles/24082/0FF1A52D6F87431FA4E7DD53B3197BB1.jpg[/IMG]
P1131 - Oxygen Sensor Lean *codes* A U
P0171 - Oxygen Sensor System Too Lean Fault Bank A
So, I decided to clean the IAC, MAF and O2 sensors. If that does'nt help, I am planning to replace the O2 sensors. Problem is, I am trying to figure out where the MAF and O2 sensors are located.
I noticed that in the air duct that connects from air filter to injector before IAC, there were two sensors.
This is the first sensor:
which I got from the area I have marked "1". Wonder what this is?
I think I have identified the IAC correctly.
At location "2" I found this:
Can someone kindly help me locate where the MAF and O2 sensors are?
Any kind of guidance appreciated. Thanks.
[IMG]local://upfiles/24082/74999B6A337341C1AAB8C1CDD1AFCAC1.jpg[/IMG]
[IMG]local://upfiles/24082/A6F01447051D4F0DB05E373337C7B3AB.jpg[/IMG]
[IMG]local://upfiles/24082/0FF1A52D6F87431FA4E7DD53B3197BB1.jpg[/IMG]
11-01-2005, 08:38 PM
#4
Thread Starter
Join Date: Nov 2005
Posts: 5
RE: Where are MAF and O2 sensors? P1131, P0171 troubleshoot.
Are the O2 sensors these then? I was looking for some sensor with four wires coming out. I am also surprised that whatever "4" is has only 1 wire and seems like another wire is cut/missing??
[IMG]local://upfiles/24082/BB5B4B1330FB4A1998213E27DC1F0A8F.jpg[/IMG]
[IMG]local://upfiles/24082/BB5B4B1330FB4A1998213E27DC1F0A8F.jpg[/IMG]
11-02-2005, 12:33 AM
#6
6th Gear Member
Join Date: May 2005
Location:
Posts: 7,445
RE: Where are MAF and O2 sensors? P1131, P0171 troubleshoot.
Start at your exhaust manifold, and follow them back. You will see the O2's along the way. Change them all. You might have 2 or 4 depending on the year. If one failed, the others aren't far behind.
11-02-2005, 12:04 PM
#10
Join Date: Nov 2004
Posts: 43
RE: Where are MAF and O2 sensors? P1131, P0171 troubleshoot.
#1 is the air temp sensor. Your car should have four O2 sensors - one on each bank prior to the cat and one in each bank after the cat. The pre-cat sensors are tough to get to, but it is do-able.
Gary
Gary