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Codes P0190 and P0191

Tiny
JBRIGHTLY
  • MEMBER
  • 2005 FORD FOCUS
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
OBDII codes P0190 and P0191. Scanner shows 10 lbs of fuel pressure. Changed FRP sensor and fuel filter. Here's the weird thing: starts fine with 40-45 lbs of pressure according to the scanner. Warms up fine. After five to ten minutes of driving fuel pressure drops to 8-10 pounds (with accompanying engine stutter or shut down). If you turn off the engine and immediately re-start it the pressure reads 40-45 lbs again. After five to ten minutes of driving does it again. Cleaned FPDM contacts - no change. Maybe they sold me a bad FRP sensor? Additional Information: I hear the fuel pump energize when the key is turned on. Fuel pressure reads one pound with key on engine off. It jumps up quickly after starting.
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Sunday, February 10th, 2019 AT 11:22 AM

7 Replies

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
The best way to verify the fuel pressure is to connect a mechanical fuel pressure gauge. Has the fuel pump been replaced? If it hasn’t, I would replace it.
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Sunday, February 10th, 2019 AT 7:48 PM
Tiny
JBRIGHTLY
  • MEMBER
  • 4 POSTS
No schrader port on the 2005 Focus.
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Monday, February 11th, 2019 AT 7:48 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

This codes comes up because the fuel pressure sensor went out which is common. Here is the location so you can replace it. Check out the diagrams (below). Please let us know what happens.
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Monday, February 11th, 2019 AT 2:29 PM
Tiny
JBRIGHTLY
  • MEMBER
  • 4 POSTS
As I said in the first post, I replaced the Fuel Rail Pressure (FRP) sensor first. No change.
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Monday, February 11th, 2019 AT 2:42 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Sorry about that, the code is for a circuit error lets use this guide to check the connection from the sensor to the PCM the wiring diagrams are below.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens.
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+1
Tuesday, February 12th, 2019 AT 9:42 AM
Tiny
JBRIGHTLY
  • MEMBER
  • 4 POSTS
Thanks Ken. At the end off the day it was the fuel pump.
All is well now.
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Sunday, March 31st, 2019 AT 5:35 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Thanks for getting back to us. I linked a video showing how to change the pump out:

https://youtu.be/D1AyqeftAmA

Use 2CarPros anytime, we are here to help. Please tell a friend.
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Monday, April 1st, 2019 AT 10:04 AM

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