2000 Ford Explorer Codes
4.0 V-6 (non OHC), 148,000 miles. 2 codes--P0171 (bank 1 system too lean) & P0174 (bank 2 system too lean). should i go ahead and replace both upstream oxygen sensors or is there somewhere else i should start. i do know that they have never been changed. any help is greatly appreciated.
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More than likely not the sensors. Probably a vacuum leak. Just went through this with my Expd. I woukld clean the mass air meter first, then check for a vacuum leak, or leakiy manifold. I had a cracked intake manifold, and my father just had a leaking intake maniflod gasket replaced on his 99 (OHC) Explorer.
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yea, i was thinking along the lines of maybe a vaccum leak, but never even considered the sensor in the air box. Thanks
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Originally Posted by glen r
(Post 4784390)
more than likely not the sensors. Probably a vacuum leak. Just went through this with my expd. I woukld clean the mass air meter first, then check for a vacuum leak, or leakiy manifold. I had a cracked intake manifold, and my father just had a leaking intake maniflod gasket replaced on his 99 (ohc) explorer.
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