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CEL code P0138

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Old Jun 27, 2010 | 10:15 PM
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Default CEL code P0138

I have a 98 Ram 1500 5.2L.
Check engine light is on and has a code P0138.
Is this for the 02 sensor before the cat or after the cat?
My 98 only has the two 02 sensors and would like to know which one is causing the code.
 

Last edited by 2robinhood; Jun 27, 2010 at 10:18 PM.
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Old Jun 27, 2010 | 10:27 PM
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Post cat O2.
 
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Old Jun 27, 2010 | 11:52 PM
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http://www.obd-codes.com/p0138
 
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