Low fuel pressure, code 4121

Tiny
JETLOADER
  • MEMBER
  • 2001 MAZDA TRIBUTE
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
Code given was 4121, low fuel pressure. It would idle rough for a minute and then stall. I put in a new fuel pump and it still idles rough but does not stall.
Monday, August 19th, 2019 AT 6:02 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Can you verify that code for me? I see no P4121 for this car.

https://www.2carpros.com/articles/stall-at-idle

Did you verify the fuel pressure before replacing the pump and after?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Monday, August 19th, 2019 AT 6:14 PM

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