Po171

[danieltrefethen]

My 2.3 Ranger is throwing code PO171, too lean on bank one.

What might be causing this?

Whats a mass airflow sensor and where is it at?

Dan

 

[jagar147]

The mass air sensor is inside the air box,where you seperate it to get to the filter,has an elec connection there.As for the code it usually means you have a vac or intake air leak and you are running lean.Check all your vac hoses for cracks,loose.brittle.With the engine ideling,spray a little starter fluid(just a little) around vac connections and see if the idle changes.If so you've found a leak.Could possibly be your EVAP lines.Long shot is a bad gas cap.

 

[jagar147]

Mass air flow sensor measures the amount of air entering the engine,feeds info to the puter which adjusts the air fuel mixture.

 

[shadetree]

The MAF sensor is in the tube going to the air box, not in the box itself. You will see the wiring connector.

A lean bank code can also be something as simple as a clogged fuel filter. It can also indicate a weak fuel pump. shady

 

[danieltrefethen]

Thank you all for the advice.

I will check these things out and let you know what I find.

Thanks

Dan