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Check engine light with codes po171 po174 - 2004 Ford F150

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Both codes are system too lean bank 1 & bank 2. Most likely a vacuum leak. Check all vacuum hoses for broken, kinked, collapsed or missing.

Posted on Nov 02, 2010

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Posted on Jan 02, 2017

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Replaced MAF, lights (check engine, TPMS ) still on


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Po171 po174 code


Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

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2003 Ford Expedition check engine light on .Codes PO171 & PO174


This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

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2003 Ford Expedition check engine codes PO171 & PO174


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Po171 po174 restricted performance


Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem?
If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.

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Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

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