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View Full Version : Codes 172, 173...running rough



Raymondo
09-24-2007, 04:05 PM
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

ELSC
09-25-2007, 02:19 PM
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

Pit Bird
09-25-2007, 04:01 PM
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.

Raymondo
09-25-2007, 04:50 PM
Fantastic guys! Thanks! I will get right on it!

Ray

Raymondo
10-01-2007, 01:40 PM
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?

sail7seas
10-01-2007, 04:14 PM
Try disconnecting the battery to clear EEC memory from old O2 sensors.

Raymondo
10-01-2007, 04:18 PM
Try disconnecting the battery to clear EEC memory from old O2 sensors.

Yep, I did...no luck...dang it! :)