SOURCE: Generic code PO171 system 2 lean bank 1 generic
This can be caused by a faulty mass air flow sensor
SOURCE: I GOT 2 FAIL CODES 0n my Ford Ranger 2004. PO171
Description : The adaptive fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Now that we have an Idea of what the codes mean , we need to narrow them down. More than likely the problem is causing both codes to set. Keeping this in mind, lets concentrate on Code PO1309. Of the possible causes listed above I see two Sensors that may throw up a lean code. I would look at the MAF Sensor first and then the Temp Sensor. You may find that if you remove the internal Sensor from the MAF Case that some degree has collected on the thin wire. If you find debree, use a Q-Tip to clean it. DO NOT USE CHEMICALS TO CLEAN IT. If no debree is found, try a Known Good MAF Sensor. Still no fix, move on to testing the rest of the Sensors on the list till you find the problem. Keep in mind that the check engine light will have to be cleared after you have fixed the problem.
SOURCE: check engine light on my 01 windstar when scaned
thats a lean code which mean there is a vaccum leak or fuel flow is low. can be the fuel filter, most likely it is a vaccum leak, spray with carb spray around the intake and the hoses and see if the idle changes
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