Solution for PO420 and PO430 Code on a 2008 Ford F-150 with 5.4 Liter V8  

Question:

Expert Reply:

These codes are typical after a header install on your 2008 Ford F-150. The 02 sensors have been relocated farther downstream. The 02 sensors take samples at timed intervials based on exhaust pulses and their location. Now that's thrown out the window. They are still taking samples but the timing is off with the exhaust pulse due to the new location.

I have an easy solution for you that has been proven to work to solve the issues you are having. Edge was right when they said the issue can be resolved by the intake and not the exhaust or tune.

This modification is commonly referred to as the "Gotts Mod." Here's what you will need to do.

Materials:

1. 7.5 inch length of 3 inch inside diameter black ABS DWV pipe.

2. One female-to-female 3 inch black ABScoupler.

3. One rubber downspout connector from the plumbing section of Lowe's or Home Depot. (Lowe's item number 23455.)

4. One 4 inch stainless steel worm clamp.

5. Small container of ABS pipe glue.

Assembly:

1. Cut black ABS pipe to length and remove any burrs from the ends.

2. Apply a light coat of ABS pipe glue to the end of the black ABS DWV pipe in a one inch wide strip. Apply a light coat of ABS glue to the inside of one end of the female coupler and immediately press the coupler into the black ABS DWV pipe with a twisting motion to fully seat the pipe in the coupler. Allow to dry 30 minutes.

3. Attach rubber downspout connector over end of female coupler and seat fully.


1. Remove stock intake tube by removing 10mm bolt holding it in place.

2. Using a large flat blade screwdriver, insert it in the joint at the end of the flexsection on the bottom where the notch is in order to remove the snorkel. Spraying silicone lubricant or WD-40 in the joint will help it come out easily. Be careful not to damage the flex section or snorkel in case you need to return to stock.

3. Loosen the 4 inch stainless steel worm clamp and slip over end of flex section. Tighten the worm clamp enough that it will not fall off.

4. Insert the end of the 3 inch black ABSDWV pipe into the flex section of the intake and slide it into the flex section as far as it will go.

5. Reinstall stock intake tube and replace10mm bolt.

6. Slide the 3 inch black ABS DWV pipe out of the flex section and seat the downspout connector in the fender holewhile compressing the flex section.

7. While holding the flex sectioncompressed, tighten the stainless steel worm clamp to hold the black ABS DWV pipe in place.

IMPORTANT: If the flex section is not compressed the DWV intake mod may vibrate or rattle.

expert reply by: Jameson C

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