1996 Ford Explorer Lean Condition

FORD EXPLORER
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TIML
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i have a 1996 explorer with 170,000 miles .the check engine light comes on.the code says it has lean condition in both right and left banks.is this oxygen sensors.
Feb 14, 2006 at 3:55 PM
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PEPPERMRJ
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code P0171 and PO174 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include:

In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure
Feb 15, 2006 at 12:49 PM
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TIML
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[quote:cbd4a58aa7="timl"]i have a 1996 explorer with 170,000 miles .the check engine light comes on.the code says it has lean condition in both right and left banks.is this oxygen sensors.[/quote:cbd4a58aa7]thanks peppermjr your solution seems to have done the trick.very appreciated
Feb 23, 2006 at 2:05 PM
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Suggested Repair

Clean the MAF sensor carefully with electronics or brake cleaner and let it dry before reinstalling. Inspect vacuum and PCV hoses for leaks and replace as needed, and check the fuel filter and fuel pressure.

Conversation Summary

A 1996 Ford Explorer with 170,000 miles had a check engine light and lean-condition codes on both banks (P0171 and P0174). The owner asked whether the oxygen sensors were at fault. The expert said the codes more often point to a dirty or faulty MAF sensor, a vacuum leak downstream of the MAF, or a fuel delivery issue, and recommended cleaning the MAF, inspecting vacuum and PCV hoses, and checking the fuel filter and fuel pressure. The owner later reported that the suggested repair resolved the problem.

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