O2 Sensor questions

[DanielJ]

I tried the search function but didnt find any threads in the search for the Third Gens. I have two questions, how many o2 sensors are there? and where are they located? Even doing a google search my browser came up with nothing useful. All for older model explorers or other model fords. Any help would be greatly appreciated. Thanks guys.

I would gladly walk outside and look for myself but im in afghanistan and the wife has no clue what im talking about so im trying to figure out so i can relay them to her so she knows and has a better understanding.

 

[ponkotsu]

I tried the search function but didnt find any threads in the search for the Third Gens. I have two questions, how many o2 sensors are there? and where are they located? Even doing a google search my browser came up with nothing useful. All for older model explorers or other model fords. Any help would be greatly appreciated. Thanks guys.

I would gladly walk outside and look for myself but im in afghanistan and the wife has no clue what im talking about so im trying to figure out so i can relay them to her so she knows and has a better understanding.

What year, engine and model is it? I can check on Fordparts.com for you.

 

[DanielJ]

2005 v6 4.0 SOHC Eddie Bauer 2wd. Thanks, ill give the site a look bud.

 

[ponkotsu]

You have two upstream (pre-cat) sensors and 2 downstream (post-cat). Don't worry about the downstream unless you have a code. The two upstream are what could affect how the engine runs. They are all accessible from underneath the truck. Not too hard to change unless they are corroded in place.

 

[DanielJ]

You have two upstream (pre-cat) sensors and 2 downstream (post-cat). Don't worry about the downstream unless you have a code. The two upstream are what could affect how the engine runs. They are all accessible from underneath the truck. Not too hard to change unless they are corroded in place.

Awesome, i appreciate it bud. Im getting a p106 code if i remember what she told me correctly. When i looked it up it came up as running rich and said either the fuel system (which would give me a lean, so no clue why it said fuels), the o2 sensors or the MAF. the only logical being the sensors. I need to order some And see if the neighbor can change them since she wont quite know what to do. lol Are the upstream ones the usual culprit for issues? She said the car idles kinda funny and sucks fuel down like crazy now.

 

[ambrosiaB]

You have two upstream (pre-cat) sensors and 2 downstream (post-cat). Don't worry about the downstream unless you have a code. The two upstream are what could affect how the engine runs. They are all accessible from underneath the truck. Not too hard to change unless they are corroded in place.

Do you know if this is the same for Limited 4.0L SOHC? I looked at diagrams for the system and with the Y configuration and actually visualizing them only found 3. Im guessing one downstream and 2 up. AAAND besides motorcraft are there any OE quality brand O2 sensors? is bosch very compatible or NTK? thank you all!

 

[ponkotsu]

Do you know if this is the same for Limited 4.0L SOHC? I looked at diagrams for the system and with the Y configuration and actually visualizing them only found 3. Im guessing one downstream and 2 up. AAAND besides motorcraft are there any OE quality brand O2 sensors? is bosch very compatible or NTK? thank you all!

Looks 2 me that they all have 4 sensors. I'm using Denso O2's on my Aviator and they work fine. I think 90% of the time you can use aftermarket O2 sensors. The only case I know for sure you can't is Chrysler. They have a biased ground voltage and only the OEM work correctly.

 

[ambrosiaB]

Awesomeness thanks!!

 

[ponkotsu]

BTW, I checked that code. I don't think it has anything to do with your O2 sensor. I had this same code once when the quick change lube joint forgot to tighten the cover on my air cleaner.

From OBD-codes.com
A P0106 could be caused by:

• Bad MAP sensor
• Water/dirt intrusion affecting MAP sensor connector
• Intermittent open in the reference, ground, or signal wire for the MAP sensor
• Intermittent short in the reference, ground, or signal wire for the MAP sensor Ground problem due to corrosion causing intermittent signal problem
• A break in the flexible air intake duct between the MAF and the intake manifold Bad
• PCM (do not assume the PCM is bad until you've exhausted all other possibilities)

 

[DanielJ]

BTW, I checked that code. I don't think it has anything to do with your O2 sensor. I had this same code once when the quick change lube joint forgot to tighten the cover on my air cleaner.

From OBD-codes.com
A P0106 could be caused by:

• Bad MAP sensor
• Water/dirt intrusion affecting MAP sensor connector
• Intermittent open in the reference, ground, or signal wire for the MAP sensor
• Intermittent short in the reference, ground, or signal wire for the MAP sensor Ground problem due to corrosion causing intermittent signal problem
• A break in the flexible air intake duct between the MAF and the intake manifold Bad
• PCM (do not assume the PCM is bad until you've exhausted all other possibilities)

lol thats definitely not it then. In the morning when she texts me ill ask her what the exact code was. She said the diagnostic page they printed for her said It was either a fuel issue, a o2 sensor or a dirty MAF. I had the code before, i cleaned the MAF and fuel system before and reset the car to see if it would come back starting with the cheapest fix and working my way up. The MAF cleaning after about a week came back. So i did the fuel system and it came back about a 2 weeks later but i was gone to the sand box by then. The last thing is the o2 sensors in line.