2002 S60 2.4 LPT
I suddenly have had an issue with rough idle. I have the following codes:

P0132 O2 Sensor Circuit High Voltage Bank 1 Sensor 1
P0171 System Too Lean Bank 1
P2096 Post Catalyst Fuel Trim System Too Lean Bank 1

I also have P0300 through P0305 misfires detected.

I have visually checked for bad vacuum lines, did the glove test to make sure there was good negative pressure in the engine, and have cleaned the MAF sensor. One weird thing is that the power brakes aren't powered at times. Makes me think a vacuum leak, but where? Any ideas out there are greatly appreciated.

 

Any updates to this? I have the same symptoms in my 02 S60.

 

sounds typical of an intake air leak or a vacuum leak. If you fail a visual inspection you may need to go to a shop to have them do a smoke test. You can also try a mist test using carb cleaner along seams or potential areas where a crack may develop. Don't forget to trace the intake through the intercooler as well.

 

I recommend to do the smoke test. It's more accurate than the visual and gloves procedure.