O2 sensors

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Feb 2, 2015 | 07:01 PM

IGeeky1

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Joined: Feb 2013

Posts: 174

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From: NorthEast Ohio

Year: 2001

Model: Cherokee

O2 sensors

So gas mileage is bad and it is running rich. Gonna replace O2 sensors. I want the two closer to the engine right? Not the two closer to the exhaust.

In the picture 7 and 10 right?

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Feb 2, 2015 | 07:45 PM

Firehawk068

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Correct.
#7 and #10 help the computer adjust the fuel/air mixture.

#11 and #12 monitor the cats.

Feb 2, 2015 | 07:50 PM

IGeeky1

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Joined: Feb 2013

Posts: 174

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From: NorthEast Ohio

Year: 2001

Model: Cherokee

Quote:

Originally Posted by Firehawk068

Correct.
#7 and #10 help the computer adjust the fuel/air mixture.

#11 and #12 monitor the cats.

Thanks, out of curiosity do you know the adverse affect of 11 and 12 going bad/getting clogged if any?

Feb 2, 2015 | 08:05 PM

Firehawk068

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Joined: Jul 2011

Posts: 731

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Quote:

Originally Posted by IGeeky1

Thanks, out of curiosity do you know the adverse affect of 11 and 12 going bad/getting clogged if any?

More than likely, if 11 or 12 went bad you would get a CEL code for something like "Catalyst Efficiency Below Threshold"

The computer reads 11 and 12, and compares them to the readings from 7 and 10, and uses the difference to calculate if the cats are functioning correctly.
Or something to that effect.