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I have a 2008b F-250 5.4L with code P0420. Real sluggish,

Customer Question
I have a 2008b...

I have a 2008b F-250 5.4L with code P0420. Real sluggish, bad mpg and says "Catalyst below threshold bank 1"

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

?

Submitted: 2 years ago.Category: Ford
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Answered in 42 minutes by:
1/31/2016
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago
EricFromCT
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 4,774
Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified
Verified

Hi. The p0420 indicates that the bank 1 cat is no good. And the truck is probably sluggish because the cat is plugged up.

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Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

If you want to verify this, you could lower your y-pipe down and drive it and see if it is not sluggish anymore.

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Customer reply replied 2 years ago
I used a laser thermoter and got temps from both cats. The driver side cat was at 750 degrees and the passenger side was at 350. The driver side has been replaced before with a universal one. Are these normal temps?
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

The drivers side is normal. The passenger side is low. The p0420, bank 1 is the passenger side.

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Customer reply replied 2 years ago
What would a low temp mean?
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

The catylist is not getting hot enough to work correctly. If the cat is plugged the exhaust does not flow through and does not heat it up correctly.

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Customer reply replied 2 years ago
Would you recommend a delete or replace?
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

If you need to every go through an emissions test you will want to replace it. Other wise the check engine light will remain on.

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Customer reply replied 2 years ago
I have a friend of a friend who has a software delete for the truck
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

That will work then as well.

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Customer reply replied 2 years ago
I thought that when a cat failed, it turned red?
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

I have never heard of that.

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Customer reply replied 2 years ago
Is Bank 1 on the pssenger side of the 5.4L
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

Yes it is.

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Customer reply replied 2 years ago
Would you be willing to give me a call?
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

I am set up for phone calls right now. That is a new service the website is starting to offer. What more questions do you have?

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Customer reply replied 2 years ago
I drilled holes in the cat. Tons of more pep when I hit the gas
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

Ok. It needs to be replaced. And you should be good to go.

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Customer reply replied 2 years ago
Do you think the O2 sensor could cause this P0420 code?
Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

no

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Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

Have you replaced the cat yet? Let me know if you have more questions and rate the service provided and have a good day!

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Ford Mechanic: EricFromCT, Ford Technician replied 2 years ago

Hi.

Have you replaced the cat yet? Let me know if you have more questions and rate the service provided and have a good day!

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