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Old 03-16-2015, 08:44 PM
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Join Date: Jun 2012
Posts: 1
check engine light

I have a 2005 rubicon L6 4.0L with 40,000 miles. check engine light came on, took to o reillys got print out of codes. code definition: catalyst 1 efficiency below threshold bank 2.
is it possible that 02 sensor could be bad with this low mileage?
the reported fixes were
replace catalytic converter?
replace front 02 sensor
performed powertrain control module PCM programming
tighten exhaust manifold bolts

any ideas what it could be?

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Old 03-16-2015, 09:00 PM   #2
jkp
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Location: Warner Robins, GA
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First, be sure they manifold bolts are tight. If the pipes are loose, it will set codes.

If you want, you can loosen the cats and look down into them, melted or broken, cats are bad.

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Old 03-16-2015, 10:21 PM   #3
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Quote:
Originally Posted by jkp View Post
First, be sure they manifold bolts are tight. If the pipes are loose, it will set codes.

If you want, you can loosen the cats and look down into them, melted or broken, cats are bad.
X2

Manifold to exhaust bolts come loose very easily on Wranglers. I had an O2 code and after tightening my very loose bolts all has been well.
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