P04F0 Code

rallyered225

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Could this code be caused by a loose connection around the intercooler? Or does this strictly apply to the EVAP/Purge system? Trying to diagnose why I'm getting this code with the HKS intercooler, piping and intake with AFR.
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I got an advance diag procedure for the EVAP when I ran the code on my end. Nothing about I/C
 

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rallyered225

rallyered225

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Swapped out the HKS to the PRL. Drove around for a few miles and those two codes won't clear.
 
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rallyered225

rallyered225

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Not sure what to do now. Any advice?
 

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Not sure what to do now. Any advice?
It's EVAP purge flow related. At full-boost WOT the engine is trying to do an EVAP purge into the intake flow, it checks the fuel tank pressure to see that there has been a change during this event, if there is no pressure change it assumes a line is blocked, disconnected or there is a purge nozzle blockage. Refer to the thread that was linked above, you most likely have a line disconnected or installed wrong on the intake you installed. In the linked thread, OP forgot to connect an EVAP hose back.
 


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rallyered225

rallyered225

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Looks like it worked itself out after swapping to the PRL. Codes went away after driving around for a while.
 
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rallyered225

rallyered225

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It's EVAP purge flow related. At full-boost WOT the engine is trying to do an EVAP purge into the intake flow, it checks the fuel tank pressure to see that there has been a change during this event, if there is no pressure change it assumes a line is blocked, disconnected or there is a purge nozzle blockage. Refer to the thread that was linked above, you most likely have a line disconnected or installed wrong on the intake you installed. In the linked thread, OP forgot to connect an EVAP hose back.
What about the fuel pump recall? I recently had this done at the dealership. Could this be causing the codes?
 

Centripetal

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I figured I'd follow up here and not hijack the PRL intake thread. Did you check the hose? Believe it or not, even a small pin hole can cause an issue like this. Unfortunately, those hoses can be easily deformed. Especially, with those sharp hose clamps that like to cut me.
Honda Civic 10th gen P04F0 Code fb_img_1624541126838-
 
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rallyered225

rallyered225

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I figured I'd follow up here and not hijack the PRL intake thread. Did you check the hose? Believe it or not, even a small pin hole can cause an issue like this. Unfortunately, those hoses can be easily deformed. Especially, with those sharp hose clamps that like to cut me.
fb_img_1624541126838-jpg.jpg
I checked the hose. I think it was just poor picture quality. Didn't notice any tears. Ended up removing the factory clamps and installed better hose clamps around the EVAP.
 
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Centripetal

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I checked the hose. I think it was just poor picture quality. Didn't notice any tears. Ended up removing the factory clamps and installed better hose clamps around the EVAP.
The factory hose clamps are actually quite good at sealing. What did you replace them with?
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