I highly doubt it is the o2 sensors causing that. For both sides of the engine to give lean codes, (P0171, P0174) it has a vacuum leak, low fuel pressure or a faulty Mass Airflow Sensor (MAF). The vacuum leak will be in the main intake area, common to both sides of the engine, like a bad PCV grommet or cracked intake boot betweem the airbox and the throttle body. Those use alot of Ford parts, and they have alot of issues with MAF sensors going bad as well. The odds of 2 o2 sensors going bad at the same time are pretty slim. You may want to find a shop that is more familiar with Jag's
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Friday, August 28th, 2009 AT 7:49 AM