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Warning: Loud noise
2016 XC90 - Started yesterday with check engine light and P0171 code. Noise is coming from the passenger side, very similar to a broken car alarm. Looks like it's going to be a second major fault just after the warranty expired.
Pull the oil cap. If it stops, it's the breather box (the plastic part the oil cap screws into). Not major.
Originally Posted by Row57
That fixed it. Would replacing the whole box would be the recommended way to go? Not a bad price if it's the part I found ( 32242753, 31670210, 32140004, 31430923 )
Originally Posted by Tech
Last edited by Row57; 05-29-2020 at 12:36 PM.
Yes, you would replace the whole box.
Replaced 32140004, cleared codes, and seems to be all better now. Glad it's not a supercharger issue. Thanks for the help.
Originally Posted by Tech
had the same code, used a cheap bluethooth obd withandroid car scanner and noted fuel trim at idle was over +30%, and at high rpms way lower, so vacum leak, in my case was the hose on the valve cover that was disconected, fix the leak and the fuel trim lowered but stil give me the code after some time.
used the same app to check the o2 sensor behavior, and seems to be ok, so decided to look at maf sensor readings and noted they look ok, BUT the value reading was kinda low on idle, and not very high when i blip the throttle.
long story short, removed the maf and cleaned with electric contact cleaner spray, the maf values raised and no more p0171.
used the same app to clear the code on the ecu
the maf sensor element is not visible so i have used the straw to spray the cleaner inside de maf.
my dealer was unable to identify the problem to, if you look at internet p0171 is a very generic code so its dificult to diagnose, i would recomend to clean the maf sensor because is just 2 screws and a can of contact cleaner.
sorry about my english.
im from brazil.
P0171 repair success: Smoked and vacuum test the intake, no leak. EGR, all good no leak, check valves holding and no issues. Deleted code, and reset ECM. With no check engine light and base fuel trims, engine idle for 10 min, fuel trims normal and no check engine light. As soon as the engine leaves idle at higher RPMs, fuel trims go beyond normal and P0171 check engine shows up. Oxygen sensors are all showing normal parameters but decided to change bank 1 oxygen sensor (first O2 sensor close to the engine). With new O2 sensor (it seem to be a new O2 sensor update part number) and ECM reset, started engine and fuel trims normal. High idle, fuel trims holding no check engine. Drive tested 40 km no more P1071. Hesitance at lower speeds seems to be gone also. (2017/ XC90 / T6 Momentum)
All this happened 120 km after taking it to my local Volvo dealer for service that included “fuel service”. I believe whatever fluid or fluid quantity used to flush the manifold and injectors ended up cooking my O2 sensor.
Last edited by General_Specific; 07-04-2020 at 06:35 PM.
2017 Volvo XC90 T6 Momentum - White
Edmonton AB - Canada
Bummer we have to deal with it but that’s exactly what my issue was as well.
Originally Posted by General_Specific
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