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Check engine light came on (1999 Infiniti QX4...had diagnosed at Auto Zone...one sensor was bad)...had replaced at mechanic shop $250....light stayed out one month...took back to mechanic after Auto Zone diagnosed,advised 4 sensors showing not working..mechanic replaced fuse, light back on in 24 hrs

Answers from the Automotive Experts

Bogi Lateiner, Owner and Technician at 180 Degrees Automotive Hi Vivian - With out knowing what the fault codes are or what sensor was replaced, or what fuse was replaced - it is difficult to say what might be going on. I do know that those engines have problems with the crank and cam sensors and it is possible that only one was replaced and it now needs the other one. My best advise is that while Auto Zone is helpful for scanning the codes - they do not do any diagnostic work. Its worth paying a reputable technician the hour diagnostic charge to have her figure out the real problem rather than simply chase codes pulled by another facility. Codes are a point in the right direction - but they do not always tell the whole story. Hope that helps! Bogi 180 Degrees Automotive, Inc. http://www.180auto.com/

Suzanne Grego, Technician at City of Philadelphia Fleet Management Vivian, These problems may or may not be related. Without knowing which sensors the technician is referring to, it*s difficult to say. A second opinion never hurts. If you are having trouble finding a trustworthy mechanic, check out the list of female friendly shops on Ask Patty. Suzanne Connect with AskPatty on: YouTube: http://www.youtube.com/user/askpatty MySpace: www.myspace.com/askpatty Facebook: http://www.facebook.com/pages/AskPatty-Automotive-Advice-for-Women/15290925093 LinkedIn: http://www.linkedin.com/in/askpatty2007 Twitter: http://twitter.com/askpatty Flickr: http://www.flickr.com/photos/askpatty/

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