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Author Topic: howling fuel pump Hungry Hippo ¯ Member # 537 posted                              could this be causing a check engine light saying i have a lean condition? my car is actually running better than ever and its a little rich if anything. its a walbro 255 with 20k miles on it -------------------- 05 S4 Avant(wagon) 09 C6 H/C/I Posts: 2959 | From: east bay | Registered: Nov 2001  |  : 94gt ¯ Member # 3060 posted                                 what code did you get? maybe its an o2 sensor? -------------------- 2020 Explorer ST 2011 Silver Raptor 'Screw Posts: 5777 | From: Beavercreek, OH | Registered: Jul 2003  |  : Hungry Hippo ¯ Member # 537 posted                              i have the code written down at home, i want to say 172, but its been a while. i tried swapping in the o2's i had on my other h-pipe but it didnt do anything -------------------- 05 S4 Avant(wagon) 09 C6 H/C/I Posts: 2959 | From: east bay | Registered: Nov 2001  |  :

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