I've for a 2001 S40 with around 60K miles on it...
Been a great car.
Anyway, the battery was starting to have trouble starting the car on cold days. I got a new battery from Napa. After replacing the batter the following happened.
With 20 miles or so the Check Engine light came on. The car seemed very sluggish.
I stopped by AutoZone. They scanned the codes for me. Following is what I got:
P0171....System too Lean (Bank 1)
P0172....System too Rich (Bank 1)
So how is it too lean and too rich?? Did the computer try to make a change and over compensate or did having the battery unplugged reset something?
Thanks for any help or suggestions.
Doug