My wife's '99 Buick Century Special 3.1L engine, 40k miles, has been
running rough and throwing codes P0101 (MAF Sensor Performance) and
P0171 (1/1 Fuel Trim System Lean). I know 1/1 means upstream O2 sensor
of the rear bank.
I have a www.alldata account on this car, and the troubleshooting flow
chart on P0171 says to take care of any other codes before
troubleshooting that one. I don't have a scan tool.
S-o-o-o - My questions are:
(1) Of all the likely probabilities, based on experience, what is *the*
most likely root cause?
(2) What are some simple tests to eliminate certain possibilities and
narrow it down so that I can avoid a shot-gun trial-and-error mode
(i.e., replace O2 sensor, problem still there, so replace MAF sensor,
maybe still not fixed, etc)?
(3) Any good GM- or Buick-specific web-based forums to post this to?
Thanks a lot for any help.
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