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So I had problems with emissions I got a new cat and a new upstream o2 sensor didnt fix it it was a p0420 code so I did some of the things that are recemended didnt fix it so I bought an downstream o2 sensor simulator and im trying to tune in the voltage I put it to 1.00v came back to rich so I...

So my 04 2.7 liter tacoma wont pass emissions due to something in the o2 sensors the upstream was bad so I replaced it put a new cat in didnt fix it so I bought a downstream simulator now iam trying to tune the voltage I set it to 1volt it came back to rich so I set it to. 26 came back to lean...