Hello all. I'm a new member. I just purchased a 2006 f-250 4x4 extended cab with a 5.4 triton. I bought this truck from the chicago area which is about 175 mile north of my home. After I bought the truck I got about 100 miles down the road and the check engine light came on. Im asuming they used a scan tool to clear the computer and get the light to go out. I did a good search before purchasing the truck and everything came up good, 2 owner, 50,000 miles, never been wrecked, etc. Payed $14,995 for the truck. Thought I got a good deal , now this. The engine seems to run perfect but I get both p0420 and p0430 codes. I just don't believe both coverters are going to take a crap at the same time, or o2 sensors. I dont here any exhaust leaks. What could be causing these codes to come up.
Thanks for the help guys. I dind't realize I would be covered since I didn't buy the truck new. My 98 f150 had 180,000 on it and the check engine light had been on it since 125,000 was on the truck. It was the egr valve not opening propper, but the truck ran fine. Ive got a pretty good scan tool and I would just check it every so often to make sure any new codes had not acured. I bought this 2006 and it just bugs me that the check engine light is on with only 50,000 on the truck. I sold the 98 to my son and he wanted the f-150 fixed, he said the check engine light bugged him. I put a new EGR valve on it and the light has stayed out. The funny thing about my son, he had a worn out saturn and the check engine light has been on it for a couple years and it didn't bother him. Maybe its not just the f-250 has only 50,000 on it, but its just a new truck to me and I want it to be perfect. LOL
EMISSIONS DEFECT WARRANTY COVERAGE
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the time it is sold - the emissions regulations of the U.S. Environmental
Protection Agency (EPA).
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of defective emissions-related parts listed under What is Covered?
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2005 F-350 XL, 4X4, RCLB, 5.4L 3V, TorqShift®, 4.10 LS, K&N CAI Kit, SCT Livewire w/ Custom Tunes from 5 Star Tuning
Could be a sensor(s). May be a CAT(s). A scantool could help in determining which.
With it being both sides it might be that an X pipe was installed, removed and replaced, and the sensors or CATs were played with. If the CATs (connected to the OEM H pipe) were hanging on a fence somewhere and got water in them (Maybe from the rain) they may have gone bad together (Rusted out.). If the sensors were installed wrong, or similarly got wet, they may be rusted out or the vent holes, as explained in the web site refered to below, may be clogged. Either way they would need replaceing.
Or, if the PO took the truck swimming and it stalled in the river, got water in the exhaust pipe and CAT(s) then they may, similarly, have rusted and gone bad. Sensors, too.
You may want to clear the codes and start from scratch.
You may find this web address helpful in determining the difference between Bank 1 and Bank 2 as well as how to check the sensors w/ a scantool.....
This area is my expertise. The P0420 and P0430 codes are pretty conclusive that the cats are not performing like they should. Weak sensors will not trigger these codes. However, weak sensors can cause the damage to the converters that in turn results in the codes.
There is a good chance the previous owner may have tampered with the converters, maybe you should take a look and make sure they have not been eliminated.
Well I checked the vaccum from the intake and the truck held 20psi. Had a person in the truck and had him bring the rpm up to 2500 and the vaccum dropped when we brought the rpm up but came back pretty quickly to 20 psi while holding the rpm steady at 2500. That tells me there is not a back pressure problem. The cat could be bad but they are not plugged. I decided to replace both down stream O2 sensors. Figured I would spend the extra money and get them from the dealer. I cleared the codes before I replaced them and the check engine light would come back on at 45 miles. After replacing the down stream sensors I have put about 220 miles on the truck and the light has stayed out. Hooked the scanner up and it read..( pass no codes found ) I'm hoping I got the problem solved.
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