p0420 p1450 p2196 stink inside cabin

[WolfDampf]

Hi y'all! I purchased the car a few months ago. 2014 100k miles. The car has these codes and also stinks bad inside when flooring it but it also stinks a bit with normal acceleration. The car won't start after I fill the gas so I know I have evap issues needing to be repaired and ordered a new feed tube. Can these other codes be caused by the evap? Or does my catalytic converter also have issue 🙁. I went ahead and ordered new front and rear O2 sensors as well as I have heard these wear out with mileage? Thanks for everyone's input

 

[Sam4]

420 is usually fixed by an O2 spacer, or a new vape tip - one or the other. Are you sure you actually have a converter?

 

[WolfDampf]

420 is usually fixed by an O2 spacer, or a new vape tip - one or the other. Are you sure you actually have a converter?

The car is most certainly 100% stock. I did get under the car and I seen the stock catalytic converter is there and i couldn't find any signs of leakage like soot or rusted out spots. The flex pipe was also clean. My thought now is that the evap issue is causing extra fuel to enter the catalytic converter and cause the fuel smell when I accelerate as it's getting burnt up?

 

[WolfDampf]

420 is usually fixed by an O2 spacer, or a new vape tip - one or the other. Are you sure you actually have a converter?

What is a vape tip? I've never heard of that

 

[SteveS]

What is the stink you smell when accelerating? Raw fuel? Exhaust?

The p1450 refers to excess vacuum in the evaporative system.
The p2196 refers to O2 Sensor 1 biased/stuck rich, which means there's too much fuel. The P2196 code can be caused by a failed oxygen or mass air flow sensor, sensor circuit problems, fuel system problems, Evaporative Emission Control System (EVAP) issues, or a bad PCM.
p0420 says the O2 sensor detects lower than desired O2, and can also indicate a fueling problem.

If the smell you get is a fuel smell, all that points to a fuel problem. Since one code refers specifically to the evaporative system, I would say that is the primary cause of your problem. Either need a new canister or there's something wrong with the hoses and/or valve that are up front. Or maybe both.

Typically the bad canister doesn't cause raw fuel smell in the cabin. So I'd be concerned that there's some kind of overfueling problem in the engine compartment.

As an aside, the problem with stumbling/dying after fueling the car usually involves topping off after the pump initially shuts off, plus not giving the system time to settle down and vent before closing the gas cap (which happens when you pull the pump nozzle out of the gas filler). With the Fiesta ST you MUST NOT top off the gas, and you MUST leave the filler nozzle in the filler for a period of time-perhaps 15 seconds-before removing it.

 

[bshanahan14rulz]

SteveS, you seem to have a more thorough understanding of this stuff, might I ask your opinion on the evap problem in general?

I think we've all done the "p1450? replace purge valve" dance. But because there are several instances of this "bad" purge valve happening again afterwards, I'm suspicious that something upstream is bad, and causing the purge valve to disintegrate.

In my case, I have an intermittant signal code that mine throws from time to time, pointing to the evap solenoid(? the thing on the back of the charcoal canister), but I don't know that is always the case in other instances I've seen reported on the internet.

Are there shadetree mechanic tests I could perform on the charcoal canister and evap solenoid that you know of? Or, possible causes you can think of which might result in the rubber seal of the evap valve (in engine bay) deteriorating?