OBD2 codes
420 (catalytic converter - bank 1)
From tacoma blog:
Hi!!
I've been reading A LOT on this P0420 problem and found out a few good thing you might like to know!!!
I lot of people have the same problem that we do, some changed everything related to emission system. Cats, o2 sensors, MAF, MAP, Temperature Sensor and still had the light coming on!!
On thing that not a lot a people think of checking is the Ethanol rating in the gasoline they use!! Toyota tacoma are set to use Gas with less then 10% ethanol... So what i did is I empty my tank and filled it back with ethanol Free Gasoline, unplug the battery to erase the codes and Guess what, no more light...
The problem with ethanol is that it doesn't burn like regular gas at all and our O2 sensors do not reconised the exhaust gas so your check engine light turn on!!!
I was using Gasoline that had 12% Ethanol and didn't know it!!
Try that and let me know what happens
Thanks
441
Evaporative Emission Control (EVAP) System Incorrect Purge Flow
from:
https://parts.olathetoyota.com/p0441-code-toyota
However, before you dive in and start testing, it's a good idea to try a basic test: Remove the gas cap, check for dirt, grime or other items on the O-ring inside and the fuel port it seals to, as a broken seal in this area can trigger the P0441 code. Also check the "seat" of the cap on the filler port to be sure it is tight by simply screwing it into place until it "clicks" and then tugging to see if there is any give.
