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Jun 4, 2022 | 10:23 PM

#21

greg8453

Senior Member

Joined: 03-29-2022

Posts: 1,241

From: Davison MI

Quote:

Originally Posted by donbrew

Elaborate, please.

An example of it's use. If there is a small exhaust leak in the manifold or pipe prior to the #1 sensor it will cause the O2 to go lean much more at idle than at cruise speeds.

Jun 5, 2022 | 06:26 AM

#22

Oldblue

Administrator

Joined: 10-13-2011

Posts: 40,083

From: Welland,Ont Canada

I’ve had a flex pipe fail it tripped P0172, I wasn’t really interested in trims on my phone screen, with the exhaust fumes coming into the cabin , I got it replaced quickly.

Jun 5, 2022 | 07:21 AM

#23

donbrew

Moderator

Joined: 01-23-2009

Posts: 26,532

From: Fredericksburg,VA

Quote:

Originally Posted by greg8453

An example of it's use. If there is a small exhaust leak in the manifold or pipe prior to the #1 sensor it will cause the O2 to go lean much more at idle than at cruise speeds.

Isn't it quicker to just look for leaks everywhere they could be? Mr. Shadetree has not been to ASE school.