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P0402 error at 850 miles

UberGadgetFreak

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My Hybrid FE has thown a P0402 this morning:
Ford Maverick P0402 error at 850 miles 1647869836559


This is the 2nd time it threw this code. Both have happened on the same tank of gas (on its 2nd tank of gas since I got it), so I am hoping that's all it is, but I wanted to see if anyone else has seen this before I take it back to the dealership.
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GrimmXL51

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I just picked up our maverick hybrid 2 days ago and I just got the same message at 80 miles. What did it end up being for you?
 

Bob The Builder

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Getting similar code on my wife's Jeep. I schedule an appt. and by the time it comes the light goes out. Frustrating as we have an inspection coming up and it will fail with the check engine light on.
 

Michigan Bill

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Take a look on OBD-Codes.com . You may find that code there.
 

Maverick2022XL

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From the shop manual

P0402:00
EGR 'A' Flow Excessive Detected

Fault Trigger Condition

Sets when PCM detects the signal at idle is greater than at KOEO by a calibrated amount. The EGR system is monitored for undesired EGR flow during idle. The EGR monitor looks at the differential pressure feedback EGR signal at idle and compares it to the stored signal measured during KOEO. A DPFEGR PID reading that is greater at idle than during KOEO by 0.5 volt or a rough engine idle may indicate a concern.

Have the dealer do the diagnostic checks on the EGR valve since it is under warranty. Could be a leak or loose hose, electrical connector problem, valve could be sticking, etc.
 

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Maverick2022XL

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Does the truck have a rough idle when the code sets for starters?
 
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UberGadgetFreak

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I just picked up our maverick hybrid 2 days ago and I just got the same message at 80 miles. What did it end up being for you?
For me, I put in some Lucas Gas Treatment and the light went out. Haven't seen it back since, and I am now many tanks beyond when I first posted (just hit 5K miles last week - original post was before I hit 1K miles).
 

Cris

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I had the same code, I just picked up my maverick from dealer. They replaced egr sensor.
 

Drew0010

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Hello,

Just got the same code. I’m on the first tank of gas that the dealer filled.

Was at 400 miles. Have an appt this Thursday 9/28 otherwise they told me it would be almost a month before they can get me in.
 

Drew0010

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Update

First try on it they said they’ll be replacing the dpfe sensor and hope they the light doesn’t come back. If it does then I’ll have to bring it back.

The mechanic did say they would need to contact the hotline in that case since egr on a hybrid is complicated to diagnose.

Hello,

Just got the same code. I’m on the first tank of gas that the dealer filled.

Was at 400 miles. Have an appt this Thursday 9/28 otherwise they told me it would be almost a month before they can get me in.
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