check engine light and code P2179

s80volvo2004 · Post by **s80volvo2004** » 25 Jun 2016, 20:08

Dear everybody,
I need your guys help, my car check engine light is on, and then i got the code P2179 after testing. I google this code and didn't get good answer. most of answer seems oxygen need to be replaced. anyone of you can provide S80 Oxygen sensor diagram? how I know which sensor is bad? some thread says there are 4 sensor for S80 Volvo, front and back are not the same, but want to know if front two are the same, two rear sensor are also the same? please help, many thanks.

Post by **MadeInJapan** » 25 Jun 2016, 20:23

O2 sensors on these cars tend to be very robust. Check our vacuum lines for leaks- unmetered air will often set the O2 code as well. How is the car driving besides the code? Vacuum diagram for your car should be under your hood. Using a carb cleaner, spraying it around the different hoses while the car is running will find a leak if you have one when the car surges.

s80volvo2004 · Post by **s80volvo2004** » 25 Jun 2016, 21:42

I didn't feel the difference while driving the car. the check engine light go away on third day, then I used CAN OBDII to find the code P2179. what I worry it not running very soon. I will check vacuum lines and see if there is leak. thanks for your replay.

s80volvo2004 · Post by **s80volvo2004** » 29 Jun 2016, 23:30

finally i found one screw is loose near air filter, fixed it, the code is gone. thanks for information.