Captain_N9ne

P0174 System to lean bank 2
P0135 o2 circuit bank 1 sensor 1
P2197 o2 sensor signal stuck lean bank 2 sensor 1
P0135 o2 greater circuit bank 1 sensor 1
P0174 system to lean bank 2

Do I just need to replace those two sensors or is something else causing these problems?
I'm planning on ordering the 2 sensors from rockauto.com they got the motor craft sensors for cheap. I was told the car only has one upstream and one downstream sensor but I've read it has two up and two downstream sensors.
how many are their?
and which motorcraft part number should i be ordering? I'm seeing more then a few different ones from different stores but rockauto.com has DY1039 and DY1058, are those the two i need?
Can anybody help me??!!?

Captain_N9ne

oh yea, its a 05 mustang 4.0 v6
i believe is was built 11/04 if that matters

rbowmar

According to Ask.com:
There are 4 sensors.

4.0L V6 Upstream & Downstream Sensor Locations

Both upstream sensors are screwed into the exhaust pipe right below the exhaust manifold flanges
Both downstream sensors are located in the catalytic converters

I hope this is useful.

808muscle

What mods? Did you change anything recently? Any work done on the car recently? Unmetered air can cause issues.....ie any leaks of air getting into the intake that dont pass through the maf sensor.

Captain_N9ne

No mods that I know of, I just bought it two days ago so I don't know anything that has recently been done. I'll check for any leaks tomorrow.

SpartaPerformance

To me sounds like a vacuum or exhaust leak.

zentin

take it to a dealer and they will take some money but will tell you exactly whats wrong....then you can go somehwere cheaper to get it fixed. People make threads asking for what wrong and they rarely ever get a correct response, so its better to just go to the dealer rather then spending time and money fixing whats not wrong.

Steven Bannoura

Intake gasket leak? Just a guess

rbowmar

If you have not bought your O2 sensors, I prefer to buy mine from Ford in the hope that they may be more accurate. Since mine are involved in many code issues, owning the sensor that matches the ECU seems logical.

If you have purchased the Rock Auto sensors, i would use them as I have heard few complaints.

serumzgsh

I just bought it two days ago so I don't know anything that has recently been done.