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Forums > > P0134 not solved with new O2 sensor
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Old 08-16-2017, 10:11 PM
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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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Old 08-17-2017, 10:20 AM
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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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Old 08-18-2017, 06:47 PM
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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 10:17 PM.
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