How do i fix a problem on a volvo s80 d5 it goes in two limp mode if i boot it.it as come up with a code po244 waste gate sensor.carnt find it.any help please

Question edited for clarity.

I think you will find it is called 'Limp Mode'. It is the Engine Control Module finding a fault so serious that is might permanently damage the vehicle. You need to connect it to a Scan Tool and read the codes. The codes tell you the problem and the fix.

Limp mode

https://www.google.com/search?q=2014+volvo+s80+limp+mode

Complete List of OBD Codes (DTC') on Volvo Cars - Erwin ...

https://erwinsalarda.com > OBD DTC
Complete List of 2259 OBD Codes (DTC') on Volvo Cars. Accessing and erasing Codes. The engine control module (ECM) fault memory can only be accessed and ...

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What r your OBD II codes ?

Sensor in overflow tank.

code p 0121 refers to throttle position (TP) sensor A/accelerator pedal position (APP) sensor A--range/ performance problem===causes ---accelerator cable adjustment--TP/APP sensor ---wiring

John Britain
o2 sensor

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Codes ' Volvo Owners Forum

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Jun 12, 2017 - 042 is a heater control circuit fault and 167 is an O2 sensor heater circuit malfunction. the air sensor may need cleaning, ...

Error codes 042/057/137/167, loss of power - Volvo Forums

https://www.volvoforums.org.uk > showthread
Aug 3, 2014 - Engine: D5: - Error codes 042/057/137/167, loss of power S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General.
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Possible problem with the alternator not putting out enough voltage. I had the same problem with my 2002 XC70, putting in a new alternator fixed it. I used a local mechanic who I found on the car talk web-site. Low Cost Volvo parts can be purchased at FCP Groton.

get to the dealer asap and have the system tested for fault codes to explain the limp mode, until the test is run it is anyones guess.

your car is going in "limp" mode,
the computer is seeing a problem with a sensor on the transmission,so it won't up shift because it doesn't know how fast your going.
check the speed sensor,the input sensor,and the output sensor.one of these is not working correctly,
it will help when you have the car checked for codes,look for history codes section.
cycling the key resets the soft code but it will always return until repaired.

There are three ecu settings? gearbox / main ecu / and center control, they all will need to be updated then a process called learning cycle which has to be reset by the technicians, then the car needs to be driven to adapt the new transmission.

hi what was the code (p 0244)sounds like you need to replace the the turbo wastegate valve .sounds to me like its overboosting as if the charge from the turbo gets too hot the engine will misfire thus causing damage to engine ,the waste gate valve is there to prevent over pressurisation