I hit 55 miles and engine light came on for too rich bank 2?

2000 FORD F-150
167,834 MILES • 4.2L • V6
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JACKNUT
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Had a hole in my gas tank for about 3 months. never a engine light on.. I changed tank, replaced tank pressure sensor, all hoses for EVAP. New hose for filler tube.. no holes in filler tube no holes in EVAP lines. drove it about 8 miles and it stalled.. started right up. I could feel a difference but it ran great most of the time. I hit 55 miles and engine light came on for too rich bank 2. Why would this happen?
Jan 14, 2020 at 3:10 PM
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SCGRANTURISMO
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Hello,

This could happen for a few different reasons. They are a stuck on fuel injector, bad O2 sensor, a failing exhaust manifold/gasket allowing air into the exhaust upstream of the O2 sensor causing a false reading that the Power-train Control Module is compensating for causing a rich condition, to name a few.

https://www.2carpros.com/articles/engine-black-smoke

Please go through these guides and get back to us with what you find out.

Thanks,
Alex
2CarPros
Jun 28, 2021 at 11:09 AM
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JACKNUT
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Why would changing a fuel tank make this code pop up? I did not have a engine light till the tank was changed.
Jun 28, 2021 at 11:09 AM
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SCGRANTURISMO
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Hello again,

It could just be coincidental. In the diagrams that I sent earlier the Ford Motor Company, who manufactured your vehicle, gave you a troubleshooting guide to track down the exact problem of the code. Please go through this and you will find the problem. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
Jun 28, 2021 at 11:09 AM
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JACKNUT
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Okay, well I was told to let the computer cycle a few times when engine light on. It came on. I cleared it. it came on. I cleared it four times. Put about 100 miles on it...all problems gone...light off. Gas mileage good and more power than it has had since I've owned it.
Jun 28, 2021 at 11:09 AM
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STRAILER
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This is an easy way to check to see what's going on. please remove the spark plugs and look for one that is dark in color compared to the rest. This will be the cylinder that has the bad stuck injector which can happen after a fuel tank repair. Here is a guide to help and a video to show you how:

https://www.2carpros.com/articles/how-to-change-spark-plugs

and

https://youtu.be/JOZiQLahXnw

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Jun 28, 2021 at 11:09 AM
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JACKNUT
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Okay. Well the first time code came on it said too rich bank 2. I cleared code. After 80 miles it came on again. This time it says too rich bank 1. but now truck runs great. great gas mileage and no stalling or rough running.
Jun 28, 2021 at 11:09 AM
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STRAILER
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Let's clear the codes one more time. it could be the computer is adjusting to the new fuel pressure. Here is a video to help:

https://youtu.be/ahK_eucFi-k

Please run down this guide and report back.
Jun 28, 2021 at 11:09 AM