Exhaust gas recirculation system flow high

[MMorf]

Today the engine service light came on in Rex the Ranger. Rex is a 2019 US born and bred Ranger Lariat FX4, with just over 60k miles. According the the app, "The engine control system has detected that the gas recirculation system flow was higher than expected for the operation conditions." Has anyone experienced this fault before and if so, what has the prognosis? Thank you all.

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[My12SecRanger]

only two issues we see really here at the dealer , most common is the sensor on the egr valve or the complete assembly , I would need the code to better determine which course of action

 

[Msfitoy]

Today the engine service light came on in Rex the Ranger. Rex is a 2019 US born and bred Ranger Lariat FX4, with just over 60k miles. According the the app, "The engine control system has detected that the gas recirculation system flow was higher than expected for the operation conditions." Has anyone experienced this fault before and if so, what has the prognosis? Thank you all.

Any of this apply to your truck?

https://www.ranger5g.com/forum/threads/bucking-surging-epidemic.14581/

 

[MMorf]

Any of this apply to your truck?

https://www.ranger5g.com/forum/threads/bucking-surging-epidemic.14581/

Nope. We were about half way home from a trip up to Michigan and the light came on. I haven't noticed any performance issues what so ever.

 

[MMorf]

only two issues we see really here at the dealer , most common is the sensor on the egr valve or the complete assembly , I would need the code to better determine which course of action

I can't get it into the dealership until July 17th, they are all booked out. Do you see any need to try to get Rex in sooner if there are no performance issues?

 

[My12SecRanger]

Drive halfway normal and you should be fine lol, keep the long trips to a minimal

 

[MMorf]

Drive halfway normal and you should be fine lol, keep the long trips to a minimal

Thank you for the information. We don't have anything long planned for a while so we should be good.

 

[airline tech]

These are the codes you will most likely see:
P0402 and Related P139C as the codes relate to each other.
Might just be momentary thing with moisture buildup in the DPFE sensor causing an erroneous reading.
So just monitor for drivability issues and actual light on the dash

For Reference: P139 = DPFE Sensor (Differential Pressure Feedback Sensor)

P139A - Hoses Reversed
P139B- Upstream hose off or plugged / restricted.
P139C -Downstream hose off or plugged / restricted.

The Downstream is the smaller one of the (2), it is the hose closest to the electrical connector.
Moisture buildup inside the sensor will give false and erroneous readings to the PCM you will most note it inside the Upstream side of the sensor, bigger tube.
The biggest issue here is that symptoms occur before it generates the code, and when it finally gets a (error difference) great enough it will pop the code.
The moisture comes from the natural moisture content in the exhaust flow, Ford has modified the DPFE sensors over the years to eliminate this issue but have yet to perfect it.

P0402 - EGR Flow Excessive Detected
* EGR Tube Restricted (This tube is the orifice tube that interconnects both the Downstream and Upstream sides of the sensor (Measuring the Differential Pressure)
* Slow Responding DPFE Sensor
* Damaged DPFE Sensor

 

[Beez]

My EGR sensor went kaput and never threw any codes. My lariat would constantly hunt between 7th & 8th gear at around 30-40 mph, with bucking and jerking. I read here on the forum to check for moisture in the sensor and sure enough that was it. I tried drying it out, but I guess the circuitry was too far gone. A new ones run between $25 and $100+ depending on where you buy it. I used the original plumbing, so I saved a good deal over purchasing the entire kit... Bought a 2nd one for the glovebox jic.

I wonder if putting an inline moisture catcher would help, or might that interfere with the pressure differential too much?

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