I put a zzp catted dp on and get the 420 code a lot. If I disable the code through hptuners will the emission check that attaches to my OBDII port know I disable it or will it be just like not having the code at all??

 

I've been through this.

Here in ohio, with our emissions testing, they will detect the code being turned off.

The ECU has to be 'ready' for them to read it. If you've recently unplugged your battery for a long time, or had a dead battery for a long time, all those long and short term fuel trims are reset and they need to be relearned. Untill they stabilize, some bit in the ECU is set to "unready" and they cannot connect to OBD2 untill that bit flips to "ready"

If any code is disabled, the ECU wont become "ready" until that code is re-enabled. Now, here in Ohio, that doesn't mean you fail. It just means they have to do a sniff test. If you think you'll pass then you are good to go.

If not you may want to think about turning the code back on and buying a couple spark plug foulers, drilling one out, screwing them into each other and into the O2 bung, then screwing the rear O2 sensor into it. This will stop the P0420 codes even if its enabled, and you ecu will become "ready" again.

 

PA is the same except that you can have one readiness montior fail and still pass emissions. I had to reinstall my rear O2 to get the readiness monitors to set. All passed except cat effeciency.

 

Do you mean these????

 

Disable the code. You will pass in WI.

 

pretty much yeah.

 

would you pass visual with the foulers on it??

 

It was never a problem here in Ohio.

 

Im glad theres no emission test in my county.

 

^i hate you lol jk man. CA is so gay about emissions. I've looked all over for answers if it'll pass visual inspection here.