I have dodge grand caravan sport the check engine is on the code is P0172 say sistem too reach bank 1

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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Bank 2 is the front of the engine ( closest side to the grill) and sensor 2 is after the catalytic converter.

P0172 LEXUS - System Too Rich Bank 1
Possible causes
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Faulty Mass Air Flow (MAF) sensor
https://www.autocodes.com/p0172_lexus.html

Po171 not P017.1 system lean http://www.obd-codes.com/p0171

P0172 not P017.2 system rich http://www.obd-codes.com/p0172

bad mass air flow sensor , O2 sensor , PVC system problem

Replace injector.

error code P0172: system too rich(bank 1)
In my opinion, replace the oxygen sensor.

actually there are 4 sensors. one on each exhaust manifold and then as you said one prior and aft the catalytic convertor. this is saying it is reading too rich a reading. check the condition of your spark plugs. you need to pin point the reason. chances are it is not the o2 sensor. happy holidays

p0172 is--system to rich ( bank 1). an oxygen sensor on bank 1, detected a rich condition ( to little oxygen in exhaust ) v6-v8 - v10 engines, bank 1 is the side of the engine that has # 1 cylinder. causes could be a vacuum leak in a hose, a dirty or bad maf sensor, or fuel pressure or delivery problems.

It means that your gas to oxygen ratio is not right. More than likely your exhaust system is to blame

P0104 Mass Air Flow Circuit Intermittent
P0110 Intake Air Temperature (IAT) Sensor Circuit
P0155 HO2S Heater Performance Bank 2 Sensor 1