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Oxygen Sensor Bypass/ Simulator

587 Views 6 Replies 4 Participants Last post by  Incognito
So recently went back to catless after passing emissions and didn't want that little engine symbol popping up again with the typical P0036 and P0139 codes. After scouring the interwebs I located a hack where you place a resistor and a capacitor in the O2 sensor wires. This got rid of the P0036 and P0139 codes even without a O2 extension but now I have a P2270 code (O2 sensor stuck lean), so FML. I'm wondering if a lower ohm resistor would get rid of the code. Just thought I'd share and maybe see if someone else has done this.

One 1 MEG ohm 1/2 watt 1% metal film resistor
One Capacitor 1 uf/microfarad 50 v/volt 85C Kemet Radial

... and here's my hack job. Everything was shrink wrapped afterwards and heat shielded.
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A proper spacer or elbow or tune will get rid of the catless CEL P0420 and not cause other codes. Tune to do so is the sure bet.
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But tuning it out leaves the sensor in a not ready state. That would usually cause a fail for emissions testing. On one of my previous cars I managed to get a secondary 02 in a ready state with a spacer, but it was temporary. The cell would come up every now and then, but I made sure to schedule my appointment when it was green
This can be true in some cases regarding tuning it but not always.
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