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Diagnosing mulitple O2 sensor codes after replacement

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  #11  
Old 08-02-2016, 10:41 PM
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P0138

Went to get the codes read today, the guy plugged the scanner in and went to start the truck and it turned over about ten times but never started. I got in and got it to start and it died as soon as I came off the gas. finally eased off the gas and it ran fine. No codes were present, light went off. I made it down the road about 4 miles and it came back on. Turned around and got the codes read. When im slowing to a stop the truck dies down to about about 200-400 rpm as im slowing, then comes back to normal rpm once i come to a complete stop. I checked vaccum lines and also checked the o2 wire for exposure. It has the 12" or 18" lead since the LT headers relocated the rear sensor.
 
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Old 08-02-2016, 10:47 PM
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This is after you replaced the O2 sensors with NTK?
 
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Old 08-02-2016, 10:56 PM
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After 2 new NTK's
 
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Old 08-03-2016, 04:24 AM
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Old 08-03-2016, 09:00 AM
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P0138 1/2 O2S Shorted To Voltage

You have a wiring problem.
 
  #16  
Old 08-03-2016, 11:19 AM
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NTK are OEM so they work 'better' but I ran a Bosch for over five years just fine. Hope you can track down the wiring issue.
 



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