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Unread 01-11-2010, 09:02 PM   #1
leechris
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1996 ZJ 
 
Join Date: Apr 2009
Location: centerville,va
Posts: 70
code p0138 bank one sensor 2

this is the code guys I know it's rear o2 sensor and it has been replaced by jeep twice i left jeep tonight and got three miles and the check engine light came back on can anyone help with some advice? thanks guys!

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Unread 01-11-2010, 10:16 PM   #2
MAO
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1998 ZJ 
 
Join Date: Jan 2007
Location: Ohio
Posts: 147
I was told if your catalytic converter is bad, this will happen. Made sense to me. Isn't that what the rear o2 sensor is for?

Last edited by MAO; 01-13-2010 at 10:10 PM..
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Unread 01-12-2010, 07:43 AM   #3
leechris
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1996 ZJ 
 
Join Date: Apr 2009
Location: centerville,va
Posts: 70
p0138 is rear o2 high voltage right?
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Unread 01-13-2010, 10:08 PM   #4
MAO
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1998 ZJ 
 
Join Date: Jan 2007
Location: Ohio
Posts: 147
Quote:
Originally Posted by leechris View Post
p0138 is rear o2 high voltage right?
I believe so. Is is definitely an issue with the post-cat sensor. The challenge is finding out why the code is being thrown. Just replacing the sensor does not always fix the error. Iit can be anything from the sensor wire grounding itself somewhere upstream to a bad converter. In my case, my cat was original with almost 200,000 miles and rusty. It was a safe assumption it probably wasn't doing its job anymore. It wasn't worth doing an emissions test to find out, and use the money saved towards the purchase.

I think I paid around $130 online for an OEM replacement. Since I was replacing my whole exhaust system anyway (my o2 sensors fused themselves into the system), I figure the price was worth the peace of mind down the road and might help resell value for people concerned with passing emissions.

Last edited by MAO; 01-13-2010 at 10:20 PM..
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