Ford P139A: EGR Sensor C Hoses Reversed

Is your scanner showing Ford P139A?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

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Ford P139A: EGR Sensor C Hoses Reversed

OVERVIEW

Severity

Medium

DIY Difficulty Level

Intermediate

Repair Cost

$200-$450

Can I Still Drive?

Yes (Short-term only)

What Does The Ford P139A Code Mean?

At idle, the exhaust gas recirculation (EGR) monitor commands the EGR valve closed and checks the differential pressure across the EGR tube orifice which should be zero to indicate the hoses are connected and not restricted. This DTC sets when the differential pressure indicated by the sensor exceeds a maximum threshold or falls below a minimum threshold.

What Are The Potential Causes Of The Ford P139A Code?

The upstream hose is disconnected
The upstream hose is restricted
The downstream hose is disconnected
The downstream hose is restricted
The upstream hose and downstream hose are reversed
Restricted or damaged EGR tube

How Can You Fix The Ford P139A Code?

Look for signs of water or icing in the hose. Verify the hose connection and routing. Check the differential pressure feedback EGR sensor for correct mounting and function.