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  • P0420 Oxygen Sensor Simulator Hack

    Ok we just passed the test using the spark plug non-fouler trick. (If you don't know that is where you get a pair of spark plug non-foulers from any auto parts store, and using a half inch drill bit (i used a conical one) drill one of them out to fit the sensor, and screw the other one on that.)It worked PERFECTLY. All monitors completed (except evap but that's passable; evap can take days to get ready) with no DTCs. I highly recommend doing that trick instead of trying this, I think it will just work on any vehicle, while this hack is tedious to get the values right, especially if you don't have any diagnostic tools to monitor the sensor voltages. You can also get spacers designed for this purpose, on ebay, (you can get 90 degree ones so you dont squash the sensor), but they'll take over…

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    Ok we just passed the test using the spark plug non-fouler trick. (If you don't know that is where you get a pair of spark plug non-foulers from any auto parts store, and using a half inch drill bit (i used a conical one) drill one of them out to fit the sensor, and screw the other one on that.)It worked PERFECTLY. All monitors completed (except evap but that's passable; evap can take days to get ready) with no DTCs. I highly recommend doing that trick instead of trying this, I think it will just work on any vehicle, while this hack is tedious to get the values right, especially if you don't have any diagnostic tools to monitor the sensor voltages. You can also get spacers designed for this purpose, on ebay, (you can get 90 degree ones so you dont squash the sensor), but they'll take over a week to ship. This hack you can probably do and pass the test all in one day!

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  • P0420 Oxygen Sensor Simulator Hack

    100 miles later and P0420 is back! >:(I think I need more capacitance. But I wonder if changing that would require a different resistance again as well.Well hopefully the smog test will allow an incomplete catalyst monitor so I can just clear the code and do the test after all the other monitors get ready but before P0420 sets again. Then I'll just live with the light.If not though I guess I will have to keep testing values, but I still don't know if it's possible for this hack to make the catalyst monitor OK without any DTCs, or if it can only inhibit the catalyst monitor from ever completing!But even if this could work out I think that because it may take you a lot of trial and error to find the right values, this isn't such a good idea and you should try a spacer instead. They sell …

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    100 miles later and P0420 is back! >:(I think I need more capacitance. But I wonder if changing that would require a different resistance again as well.Well hopefully the smog test will allow an incomplete catalyst monitor so I can just clear the code and do the test after all the other monitors get ready but before P0420 sets again. Then I'll just live with the light.If not though I guess I will have to keep testing values, but I still don't know if it's possible for this hack to make the catalyst monitor OK without any DTCs, or if it can only inhibit the catalyst monitor from ever completing!But even if this could work out I think that because it may take you a lot of trial and error to find the right values, this isn't such a good idea and you should try a spacer instead. They sell spacers designed to eliminate P0420; there are also angled ones if straight ones won't fit.

    Well it looks like my plan isn't gonna work as I hoped! I cleared the codes last night and after just FOUR miles the P0420 came back on!! How, when last time it took two days and *124* miles to get P0420 back?? Oh and yeah, we called the smog test place and they said an incomplete catalyst monitor is passable if it's the only one.

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  • P0420 Oxygen Sensor Simulator Hack

    yes voltage doesn't matter

    104009.1 ohms actually, idk why I included that 9.1 ohm resistor. Anyway 104K didn't work, so on the way home I stopped and rewired it to 11K ohms. And I think I might've found the sweet spot; there's no pending code and both oxygen sensor monitors are OK now, so I think it passed its tests. However the catalyst monitor is still incomplete.Before with 104K the catalyst monitor got OK but the oxygen sensor and oxygen sensor heater monitors were incomplete when I checked the status soon before the light came on (and i saw the p0139 pending).

    Did the catalyst monitor ever complete? Or will this hack make it never complete? I can't find the relevant smog test requirements for my state :/

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  • P0420 Oxygen Sensor Simulator Hack

    I tried this with a 1uF capacitor and 1.03Mohm of resistors on a gen 3 prius but I got p0137 (low voltage) instead :( I removed one of the resistors to make 520Kohm i think it was, but I still got p0137 :(I will try to find a ~100K ohm resistor and keep trying lower values if that doesnt work. With no resistor (only the 1uF cap) i got p0138 (high voltage) and p0607 (i guess it messed with ecm). So it looks like the right value is still to be found between 0 ohm and 500K ohm

    I will try 104K ohm now

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  • poiihy commented on lbateman1's instructable Automatic Pool Filler

    Haha cool I like that

    You used an electrical conduit, with wires in it, to deliver the water to the pool??

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