Codes 172, 173...running rough

Raymondo

Registered User
I have a '95 SC that is running rough and the Check Engine light comes on. I pulled two codes, 172 & 173 with a code scanner. Any advice? I am thinking it is a sensor of some kind.

Thanks!
Ray
 
Code 172, o2 sensor indicates lean, and 173 o2 sensor indicates rich, both bank 1. I had this a few weeks ago, just replaced O2 sensor, and its fine now.
Good Luck,
Brian
 
Same thing here I had those codes as well. My CEL would come on for a few seconds at a time every few minutes I pulled out the O2s and my right one was visibly covered with soot and the left pretty clean. I went ahead and changed them both for right under $100. The best price I found on them was at O’reilly auto parts and I think you have them in your area. Once I change them the light was gone and after the relearn the car runs great and improved my MPG as well.
 
Ok. I replaced both O2 sensors and seemingly cured that problem. Now the CEL comes on at random and the car sputters. The code scanner does not pull any codes. Any suggestions?
 
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