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Running lean

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14 Apr 2019 06:37 - 14 Apr 2019 20:30 #28675 by Jakeo
Running lean was created by Jakeo
Hi paul just wanting a bit of advice on a problem a car is having in my workshop.
So its bringing up a code for post cat a/f sensor reading lean, the thing we are struggling with is have observed fuel trims and we dont seem to be getting anything out of the ordinary and the code is logged when on deceleration and only at about 800 rpm. We suspected possible 02 sensor which was swapped and same result. The vehicle does not seem to have any noticeable drivability issues and no complaints of low power or anything.
I thought it could possibly be related to a dirty injector as i have seen a code for this type of lean condition in the past but not on the same vehicle.
Was just hoping you may have some advice for me possibly or a direction we may be able to go in. From memory code p2096.
Thanks very much in advance!
Loving the site by the way very informative
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Last edit: 14 Apr 2019 20:30 by Jakeo.

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14 Apr 2019 09:52 #28680 by Chad
Replied by Chad on topic Running lean
What year, make, model, and engine size is this car?

Do you have sensor graphing capabilities?

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

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14 Apr 2019 11:00 #28682 by Tyler
Replied by Tyler on topic Running lean
Definitely need the Y/M/M. P2096 is a somewhat common code across multiple makes, unfortunately. :silly:

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14 Apr 2019 20:27 #28690 by Jakeo
Replied by Jakeo on topic Running lean
Sorry it is a 2010 mazda cx7, 2.3turbo motor. I do have an old snapon modis scan tool with a 4 channel scope however iv not used it much hence why iv joined this site to try and continue learning.

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14 Apr 2019 20:32 #28691 by Jakeo
Replied by Jakeo on topic Running lean
Have attached picture of freeze frame capture of code. Just a bit confused as we dont seem to be getting abnormal fuel trim readings to indicate a lean condition. Its the downstream 02 sensor that is logging this code.

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15 Apr 2019 09:33 #28698 by Tyler
Replied by Tyler on topic Running lean
Gotcha, thanks! :cheer:

If the trims are solid across all conditions, then I'd start by looking for an exhaust leak. Doesn't matter if you can hear one or not - even pinholes can piss off the downstream fuel control.

Smoking the exhaust would be a good idea. If you have an exhaust cone and an air pressure regulator, that'd be even better. Dial it up to around 5 PSI and use soapy water to look for leaks.

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