How many o2 sensors on my explorer?

Rosemarie Salazar

Asked by Nov 30, 2015 at 04:38 PM about the 2003 Ford Explorer

Question type: Maintenance & Repair

I have two codes on it.. p0171 and p0174

2 Answers

Tom Demyan

Those codes are not O2 specific, they spell out that you have a vacuum leak and or lean condition. Check your air hoses off the intake and gaskets for an air leak after the MAF sensor.

1 out of 1 people think this is helpful.
Guy Outland

The explorer was known for the j shaped vacumn hose from the passenger side of the engine just behind the throttle body and runs around to the back of the intake to degrade and suck a hole in them near the front of the engine. Listen for a hiss noise while the engine is running you will probably find that the lean codes are caused by this hose sucking air.

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