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The ecm code says system too lean ##1 what part do i need?

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the ecm code says system...
the ecm code says system to lean #1 what part do i need?
Submitted: 8 years ago.Category: Ford
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6/16/2010
Ford Mechanic: Ron, ASE Certified Technician replied 8 years ago
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 38,791
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Ron :

Hello

Ron :

What code are you getting?

Customer:

po171

Ron :

The code P0171 ia lean code for the bank one (passenger side) HO2S sensor, but before you replace it, locate the PCV valve in the passenger side valve cover and follow the vacuum supply line from it around to the back side of the upper intake where it connects and check and see if the rubber elbow is rotted and leaking (very common for this code) .

Ron :

Let me know how it goes.

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