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2006-2009 Range Rover MkIII / L322
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I have a 2006 range rover HSE non sport or supercharged. About 3 months ago the check engine light came on. I scanned it and it read "p0173". So doing my research i changed both o2 sensors before the cat, pcv valve. I took it to a mechanic to minimize dealer costs. he could not find the "leak". Does anybody know what might be the problem? I'm getting around 10-11mpg. I would like to avoid the dealers till the very last point. If there's a person out there that skilled in that area i would really appreciate his advice. thank you
 
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