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Old 06-01-2007, 08:23 AM
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NissanTech NissanTech is offline
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2004 Xterra
 
Join Date: Jun 2005
Location: California
Age: 48
Posts: 12,291
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Hello

Check the screws behind the speedometer head. The screws are used as connectors for the speedo head. Sometimes the screws come loose and set code P0500.

The other code P0136 is for the rear O2 sensor, and you most likely have to replaced the sensor to repair the problem.
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