2016 F150 Ecoboost 3.5 P0420 and P0430
#1
04-11-2019, 08:07 PM
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2016 F150 Ecoboost 3.5 P0420 and P0430
Just bought
2016 F150 Ecoboost last week with 138k miles.
Drove it home a few hundred miles and no issues
Few days later CEL with
P0420
Mechanic checked o2 sensors and said they were still ok. We ended up replacing the cat as it was below threshold with an OEM Ford Cat
Cleared the code, drove for 30 miles and CEL comes back but now with a P0430 code for the other left catalytic converter being below threshold. Has anyone else had an issue like this? Should I go ahead and replace the o2 sensors this time along with the left catalytic converter? Could it be another issue that the mechanic may be overlooking?
Thanks
2016 F150 Ecoboost last week with 138k miles.
Drove it home a few hundred miles and no issues
Few days later CEL with
P0420
Mechanic checked o2 sensors and said they were still ok. We ended up replacing the cat as it was below threshold with an OEM Ford Cat
Cleared the code, drove for 30 miles and CEL comes back but now with a P0430 code for the other left catalytic converter being below threshold. Has anyone else had an issue like this? Should I go ahead and replace the o2 sensors this time along with the left catalytic converter? Could it be another issue that the mechanic may be overlooking?
Thanks
#3
04-12-2019, 06:03 AM
Join Date: Feb 2015
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#4
04-12-2019, 07:19 AM
Just bought
2016 F150 Ecoboost last week with 138k miles.
Drove it home a few hundred miles and no issues
Few days later CEL with
P0420
Mechanic checked o2 sensors and said they were still ok. We ended up replacing the cat as it was below threshold with an OEM Ford Cat
Cleared the code, drove for 30 miles and CEL comes back but now with a P0430 code for the other left catalytic converter being below threshold. Has anyone else had an issue like this? Should I go ahead and replace the o2 sensors this time along with the left catalytic converter? Could it be another issue that the mechanic may be overlooking?
Thanks
2016 F150 Ecoboost last week with 138k miles.
Drove it home a few hundred miles and no issues
Few days later CEL with
P0420
Mechanic checked o2 sensors and said they were still ok. We ended up replacing the cat as it was below threshold with an OEM Ford Cat
Cleared the code, drove for 30 miles and CEL comes back but now with a P0430 code for the other left catalytic converter being below threshold. Has anyone else had an issue like this? Should I go ahead and replace the o2 sensors this time along with the left catalytic converter? Could it be another issue that the mechanic may be overlooking?
Thanks
Also, it’s about time to replace the spark plugs and coils. These are items that you can do yourself if you want to save some money.
Were the fluids changed beforehand.
How about the air filter and serpentine belt?
#5
04-12-2019, 08:03 AM
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Air filter good
Ill do the spark plugs and coils. Does anyone have the part numbers for the 3.5 ecoboost?
#6
04-12-2019, 10:28 AM
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Is it necessary to replace the coils along with the spark plugs? No signs of it running bad.
#7
04-12-2019, 10:33 AM
That's the first I heard of them being an issue. No question that the O2 sensors are a common wear item. I would not be surprised to see the cats having issues after 135K miles. The driving conditions (around town vs highway) can have a significant impact on their longevity.
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#8
04-12-2019, 10:38 AM
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That's the first I heard of them being an issue. No question that the O2 sensors are a common wear item. I would not be surprised to see the cats having issues after 135K miles. The driving conditions (around town vs highway) can have a significant impact on their longevity.
all 4 o2 sensors
both cats
and spark plugs
and fluids
sound reasonable? Any other suggestions
#9
04-12-2019, 11:39 AM
The cats should last well past 200k if not the life of the truck. Your issues are caused because of misfires and this is always the outcome. The 3.5 needs plugs and boots routinely at 60k max intervals. If not the fuel pools in the turbos and will melt the matrix in the catalyst. The coils should be fine but the boots are required when doing the plugs.
#10
04-12-2019, 12:07 PM
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The cats should last well past 200k if not the life of the truck. Your issues are caused because of misfires and this is always the outcome. The 3.5 needs plugs and boots routinely at 60k max intervals. If not the fuel pools in the turbos and will melt the matrix in the catalyst. The coils should be fine but the boots are required when doing the plugs.
Have this part number for the coil and boot
BL3Z-12029-C
#11
04-12-2019, 03:09 PM
#12
04-13-2019, 05:08 AM
No, it’s not required but that’s just something that I’d do when purchasing a vehicle with so many miles. Nothing wrong with starting with a new and fresh ignition system for the next 100K miles plus you’ll eliminate that being a potential source of your problems.
#13
04-14-2019, 09:18 PM
#14
04-15-2019, 08:15 AM
Cargo Master
The cats should last well past 200k if not the life of the truck. Your issues are caused because of misfires and this is always the outcome. The 3.5 needs plugs and boots routinely at 60k max intervals. If not the fuel pools in the turbos and will melt the matrix in the catalyst. The coils should be fine but the boots are required when doing the plugs.
#15
04-15-2019, 11:04 AM