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O2 sensor screen shots. #4563483
11/03/17 10:01 PM
11/03/17 10:01 PM
Joined: Jan 2017
Posts: 278
Iowa
Iowegian Offline OP
Iowegian  Offline OP
Joined: Jan 2017
Posts: 278
Iowa
2011 Equinox 2.4l. Just had the rings and pistons replaced courtesy of GM.
My downstream o2 sensor used to run at .8 volts and was very steady. Now it looks like this. Yes car was warmed up.

Catalytic converter is still under warranty and in fact GM extend the warranty out.

No codes so I'm guessing that it's starting to go but not bad enough yet for a code.

Or maybe everything is fine???




2011 Equinox, 2.4l
2009 Sienna, 3.5l
Re: O2 sensor screen shots. [Re: Iowegian] #4563553
11/04/17 01:48 AM
11/04/17 01:48 AM
Joined: Jul 2009
Posts: 432
Seattle
Superflop Offline
Superflop  Offline
Joined: Jul 2009
Posts: 432
Seattle
Yeah i would think its on its way out also. .8 and .2 are a bit out for switching voltage (from ruch to lean) .6 and .3 being closer to what you want.


2002 saab 9-5 2.3t wagon
2014 dodge grand caravan
Re: O2 sensor screen shots. [Re: Iowegian] #4563634
11/04/17 06:20 AM
11/04/17 06:20 AM
Joined: Jan 2017
Posts: 278
Iowa
Iowegian Offline OP
Iowegian  Offline OP
Joined: Jan 2017
Posts: 278
Iowa
I was looking at the downstream sensor (green line). It's starting to switch too much and is following the upstream sensor (red line).

I thought the upstream is supposed to switch between .1 and .8 ish


2011 Equinox, 2.4l
2009 Sienna, 3.5l

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