Ok, so I have a 98 V70 non-turbo with 166k on it. Car runs and drives just as usual but it set a code P0172(Bank 1 Too Rich) a couple weeks ago. I have read up about the code and tried most everything to get rid of it. I cleaned the MAF(it was only a few months old anyway), checked for vacuum leaks and found a few and replaced the broken rubber elbows where the leaks were coming from. Light still comes back after about 80 miles of driving or less. I then checked the cap and rotor button and they were worn out so I replaced both of them. Now, not only do I get the Rich code but now I get a P0505 for Idle Control System fault. Idle is fine and doesn't do anything out of the ordinary.

Can someone please help me figure these codes out? I am due for an emissions inspection shortly and will have to have the codes fixed in order to pass.

 

Look for some more vacuum leaks. I usually clear that P0172 code by connecting a vacuum elbow.