Engine codes P0171 and P0173, a lean fuel system condition, the engine may miss fire or feel lazy. Modern cars and trucks have many sensors that send information to the engine computer. The engine computer looks at the information coming in from all the input sensors and then it makes changes to the, transmission operation, ignition timing and fuel injector delivery. The computer does this very fast, so fast most drivers will never feel the changes taking place.
The computer adjusts many outputs at the same time, every second.
The PCV hose pictured above, is for a 2009 Ford truck. The old hose went bad and caused two codes in the engine computer. P0171 and P0173 are codes for a lean condition inside the engine. The hose below failed, causing the codes to set in the engine computer.
When the C.E.L. (check engine light) comes on, it makes you wonder, is it critical or a minor issue. Plus now you have something new to fit into your budget, Great!
As long as your check engine light is not flashing at you, you can still drive your car, but should get it in for service as soon as possible. The light is on for a reason.
A lean condition can cause many issues. Fuel economy will become poor and the engine may even stall when coming to a stop. It will run rough when cold and lack power when warm. It needs attention, your ride is unhappy, and it’s time to make a repair.
Hose failure is the most common cause of a lean fuel system. Many parts on the engine can cause a lean code issue, so you should have a ASE certified shop look at your engine light issue. Free code checks at the auto parts store will not be 100%.
I use dealer parts often. In this case, the PCV hose has been updated. When ever I have a chance to make a repair that will solve more than one issue I do it. The hose was updated to prevent PCV carbon build up and the rubber hose joints are made thicker. The part was less than $30.00. An investment vs just using a regular chunk of hose, but it will last. At Tony’s service center every repair we do comes with a 2 year 24,000 mile warranty.
Stop in for a visit today.
It’s all good under the hood. Anthony Xavier ASE Master Technician
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