I have a volvo s80 t6 with error codes 171 and 174 it says lean air fuel mixture the engine runs rough sorta like its skipping. What needs to be checked and possible replaced ?

https://www.fixdapp.com/blog/p0171

changed the wrong sensors
the code (p0057)refers to the heated oxygen sensor (HO2S) which is in the exhaust manifold before the cat converter
code p 0172 refers to system too rich bank bank 1===causes ---intake blocked ---EVAP canister purge valve --- fuel pressure---EGR systems ---injector/s---HO2S
If you replace the HO2S sensor/s then that will [robably fix all codes
the heated oxygen sensor reads the exhayst gas and reports to the ECM to adjust the air /fuel ratio to get the engine to run within parameters
when it is not working , it runs lean or rich

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t means that your fuel system has reached its limit of compensation for the fuel system. As the engine is driven if the fuel system computer sees that the fuel mixture is too rich or too lean it begins to compensate by increasing or decreasing the amount of time the injectors are on. When it reaches its limit it throws the code. It is usually a vacuum leak or bad oxygen sensor that sets the code

This message could have been brought up for any number of reasons and the fact that they are fully computerised makes them very complicated (eg. Sensor failure elecronic failure, misfiring mechanical failure) without the right tools, you will need a volvo vida code reader (check ebay). Otherwise you will have to go to a volvo repairer to get the car scanned for error codes. Note; a independent volvo workshop is generally cheaper for the same thing.

MANY THINGS WILL CAUSE THAT PROBLEM. COULD BE FAULTY ELECTRONIC THROTTLE SYSTEM MALFUNCTION.COULD BE FAULTY MAP SENSOR, FAULTY ECM, RESTRICTED FUEL FILTER OR WEAK FUEL PUMP.RESTRICTED EXHAUST SYSTEM. FAULTY TURBOCHARGER. BEST TO GET VECHICLE CODE SCAN TO SEE WHAT CAUSING CHECK ENGINE LIGHT TO TURN ON.

make sure the oil level is up to full. sorta sounds like its low and when you go around a corner the oil sloshes away from the pickup tube

171 and 174 are lean mixture codes, 300 is a random misfire (any cylinder). Check for a vacuum leak, listen for a hissing noise with engine idling.

my volvo s80 t6 air conditioning not working well and often cause over heating. why?

I think that you have a contaminated or bad Mass Air Flow (MAF) sensor. It's located by the engine air filter housing. You can get a used one online for less then 100.