Downstream (after cat) O2 sensor ?
Thread Starter
12 Second Club
Joined: Nov 2005
Posts: 407
Likes: 1
From: Rockwall, TX
Downstream (after cat) O2 sensor ? Starting a new thread, hoping to get better results in gen. maint. and repairs...
With my scan tool graphing o2 output, I can see both upstream o2 sensors switching rapidly which I understand is normal. My 2 downstream o2s are doing diferent things.
Bank 2 sensor 2 is closely following bank 2 sensor 1 but with a slightly increased voltage.
Bank 1 sensor 2 is not following bank 1 sensor 1 but hovering right around .8v.
Which is correct? Is my bank 1 sensor 2 bad, or is my bank 2 cat bad?
Thanks,
BTW I'm looking at my '05 Jeep TJ, but my Wrangler "friends" are not as tech-helpfull as the LS1tech folks.
With my scan tool graphing o2 output, I can see both upstream o2 sensors switching rapidly which I understand is normal. My 2 downstream o2s are doing diferent things.
Bank 2 sensor 2 is closely following bank 2 sensor 1 but with a slightly increased voltage.
Bank 1 sensor 2 is not following bank 1 sensor 1 but hovering right around .8v.
Which is correct? Is my bank 1 sensor 2 bad, or is my bank 2 cat bad?
Thanks,
BTW I'm looking at my '05 Jeep TJ, but my Wrangler "friends" are not as tech-helpfull as the LS1tech folks.
Thread Starter
12 Second Club
Joined: Nov 2005
Posts: 407
Likes: 1
From: Rockwall, TX
Had to remove the down pipe to change the rear main seal on the Jeep. Bank 2 cat had the substrate broken away from the can and was turned sideways inside. Definately a bad cat.
Thanks again, you were spot on.
Thanks again, you were spot on.
