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Re: Engine codes Po171 Po174 Po401
The vast majotity of Ford vehicles with P0171 and P0174 codes are suffering with a vacuum leak. The biggest culprits are the hoses going to the PCV valve. The rubber deteriorates due to heat and oil fumes. Check the hoses and rubber elbows between the PCV valve and the intake manifold. Pay very close attention to the rubber elbows. They crack on the onside and can be hard to spot.
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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 .
PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5
the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty
missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer
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
The Code 401 is saying there is no flow to the EGR. The other 2 codes say both sides of the engine are running lean.
You can look for Vacuum diagrams for your model car and get some photos to see routing.
What you might do is use a digital camera and try to find a car in a Salvage yard with the parts you need attached. Photo them and then take the hoses and solenoids off the Salvage car and add them to yours.
This would be the cheapest and most complete way of doing this. Unless you can find a shop willing to install used parts to your car. Now some Body shops routinely use Salvage parts for Bodywork. One may be willing to do a little mechanic work to help you. They do mechanic work to replace broken engine parts from accidents, so working on engines is just part of the job.