My info shows 171 is a lean code.
172 is a rich code. At the moment, if no check engine lite and no driveability issues, I wouldn't go hunting trouble. Intermittent issues can be a pain to track down.
Yes, the 02 sensor could be an issue, but, without testing, we're just throwing parts at it.
Monday, October 10th, 2011 AT 6:46 PM