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P0134 not solved with new O2 sensor Forums > > P0134 not solved with new O2 sensor P0134 not solved with new O2 sensor
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  #1  
Old 08-16-2017, 09:11 PM
Michael Lee Michael Lee is offline
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2002 Quest
 
Join Date: Nov 2015
Posts: 8
Default P0134 not solved with new O2 sensor

P0134 code returns after replacing O2 upstream sensor. After running a bit, engine intermittently idles roughly and hesitates on acceleration. What else might cause this code and behavior??! 2 different shops failed to solve this, now I'm desperate!

2002 Quest SE 3.5
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  #2  
Old 08-17-2017, 09:20 AM
NissanTech's Avatar
NissanTech NissanTech is offline
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2004 Xterra
 
Join Date: Jun 2005
Location: California
Age: 52
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Check for intake leaks. An intake leak could cause both symptoms and trigger the code. A bad O2 sensor or O2 sensor wire could trigger the P0134, but won't cause the engine to run rough or hesitate.
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  #3  
Old 08-18-2017, 05:47 PM
Michael Lee Michael Lee is offline
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2002 Quest
 
Join Date: Nov 2015
Posts: 8
Default Good advice!

This sounds like excellent advice. In fact, I can hear a hiss from behind the engine, between it and the fire wall--probably a hose. I won't get to work on it now for a bit, but I wanted to thank you for the help. Can't figure out why 2 mechanics didn't look for that!

Last edited by Michael Lee; 08-18-2017 at 09:17 PM.
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Old 10-23-2019, 02:12 PM
Prettybrittney Prettybrittney is offline
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2001 Xterra
 
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I'm having the same exact problem. I checked for hissing & what not & didn't hear anything. Do you know what else it could possibly be?
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  #5  
Old 09-21-2020, 12:46 PM
smile100h smile100h is offline
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1999 Quest GXE
 
Join Date: Feb 2008
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Try to add grounding wire directly to battery negative post. I had this issue after replacing oxygen sensor for 3 times and the P0134 came back always. For details, please refer to my other post: 2002 Quest o2 sensor
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