Rough idle After fixing the down stream o2 sensor pigtail after it got ripped out but the exhaust system falling off. Now the car is not running right. A knock sensor code was on and the o2 sensor code from it being knocked out. we fixed the pigtail and cleared the codes. it ran fine and all the sudden it ran rough. It then threw another code for the uppstream o2 sensor. we tested that and it checked out as perfect. We then cleared that code and no check engine lights are on now and its still running rough.

Did you clean the Throttle body? That is often the cause of a rough idle.

The Fuel Air o2 sensor on the manifold is often hard to reach, but the downstream o2 sensor after the catalytic converter is easier to get to.

Code P0172 indicates Bank 1 of the engine has a rich fuel mixture. P0175 indicates Bank 2 of the engine has a rich fuel mixture. Engine Bank 1 is the same side of the engine as Engine Cylinder 1. Engine Bank 2 is the opposite side of the engine. A firing order and cylinder location diagram may be needed to see which side of the engine is Bank 1 or Bank 2.
P0172 is triggered by the engine bank 1?"upstream" oxygen sensor and P0175 is triggered by the engine bank 2 "upstream" oxygen sensor. The oxygen sensor alerts your system when the condition is too rich meaning there's too much fuel int the exhaust stream or too little oxygen in the exhaust stream. The symptoms and causes will help you determine the exact issue and how to fix it.
Your bank 1 or bank 2 sensors will be referred to as "sensor 1" or "sensor 2". Sensor 1 refers to "upstream" sensors, or the ones near the engine and before the catalytic converter. Sensor 2 is "downstream" or after the converter.

Location

https://www.google.com/search?q=2005+Dodge+Durango+4.7+engine+bank+2+upstream%E2%80%9D+oxygen+sensor+location

all about the code

https://www.google.com/search?q=2005+Dodge+Durango+4.7+P0175+code&

Battery condition?

https://www.dodgedurango.net/threads/05-4-7l-codes-p0172-and-p0175.77565/

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Usually in the exhaust pipe near the engine.
They don't usually cause a rough idle, and the check engine light should be on if you have a faulty sensor.

The up stream O2 sensor is on the back side of the engine in the exhaust manifold ! The down stream O2 sensor is under the vehicle after the catalytic converter ! What code P0xxx what . Just because it has an O2 sensor code doesn't mean the sensors are bad . Should check wiring , signal wire to PCM an Ground .


Heated Oxygen Sensor Replacement - Sensor 2


Tools Required

J 39194 Oxygen Sensor Wrench



Removal Procedure

1. Turn OFF the ignition.



Caution: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.





2. Raise and support the vehicle.

Remove the splash shield (3). Disconnect the electrical connector retaining tab (1) from the heated oxygen sensor (HO2S) electrical connector (2). Disconnect the oxygen sensor connector (4) from the HO2S electrical connector (2).




Important: The HO2S may be difficult to remove when engine temperature is below 48?°C (120?°F). Excessive force may damage threads in exhaust manifold or exhaust pipe.



Use the J 39194 in order to remove the oxygen sensor (4) from the exhaust pipe .



Heated Oxygen Sensor Replacement - Sensor 1




Notice: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.



Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.




Removal Procedure

1. Remove the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical .



2. Turn OFF the ignition switch.



3. Remove the HO2S retaining clip from the bracket.



4. Disconnect the HO2S electrical connector tab from the HO2S 1 retaining clip .



5. Remove the HO2S electrical connector retainer.



6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

The first thing to do is to run the fault code and find the area that is being affected . It could be MAF sensor or low fuel pressure or faulty injector or faulty coil/s. It is a waste of money guessing until you know the codes

The O2 sensors are in the exhaust. Your have up stream and down stream. The upstream is right behind the engine in the down pipe back by the firewall. The downstream sensor is under the car back by the catalytic converter.

check that your map sensor is getting direct vacuum. if it's mounted directly on the throttle body, take it off and see that the vacuum passage is not clogged up. also check that it is getting voltage and that the computer sees it. Your map sensor and tps are responsible for how much fuel goes into the engine when you are driving; the o2 pretty much only regulates idle mixture. also see that your egr is not stuck open.

the sensor that controls the mixture is the heated oxygen sensor (HO2S) in the exhaust manifold
compression is low as it should be no less that 125 psi that is if the readings were taken with the throttle wide open
the noise in the exhaust indicates unburnt mixture accumulating in the muffler to flash off
check for a crack in the flex section of the exhaust near the manifold

If the engine runs good and is not rough then you may just have a defective O2 sensor. The sensor is located in the exhaust pipe just off the engine. See picture below.

At an idle, no car should have a red hot exhaust manifold. If it does, this could indicate a clogged Catalytic Converter. or a o2 sensor thats bad. I would not drive it until it gets fixed. convertor, timing, etc, just get it checked out! good-day !

as you are looking at the exhaust you will see the catalytic conveter (large very hot peice) behild it is the downstream sensor the pig tail runs out of the back of the sensor, usually plugs and unplugs right the under the car if it runs through the floor board then you will have to pull the seat and go under the carpet