Low fuel pressure, code 4121

2001 MAZDA TRIBUTE
65,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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JETLOADER
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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.
Aug 19, 2019 at 6:02 PM
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ASEMASTER6371
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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
Aug 19, 2019 at 6:14 PM