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Daryl, Shop Owner, Master Mechanic
Category: Ford
Satisfied Customers: 12549
Experience:  28 years experience, Master Mechanic
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ford focus 2000 code p0171 bank 1 system too lean, Thanks

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ford focus 2000 code p0171 bank 1 system too lean, Thanks

The PCV valve hose and a dirty Mass air flow are the 2 most common causes of this problem, the PCV hose often gets bad and collapses the mass air flow sensor can be cleaned using a brake cleaner or air intake cleaner. I would start with these and see if the problem is gone, the code will need to be cleared using a scan tool.

Edited by zzdaryl on 12/31/2010 at 2:28 PM EST
Customer: replied 6 years ago.

I look at PCV hose and did not look bad or collapsed. Cleaned the MAF sensor and guy at auto part just let me use the computor, cleared the code and recheck for codes, none. Drove the car home and no engine light. Have to say the using the computor was cool.
I believe that's a fixed problem, Thank You for your time this morning. Craig

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