When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So you interpreted the sequence as a 172? I could not find a code 172 on the KOEO chart. There is a code 172 but it was on the KOER side and it said a "HEGO sensor on the right side". Thanks for your help.
The 172 you saw was a CM code and not a KOEO or KOER code.
It means that the engine was running lean during engine operation at sometime in the last 80 start ups.