[dirtydeeds]

That's exactly the code I get with Long Tube headers. How come the code comes back quicker each time I erase it?

 

[dirtydeeds]

Do you have cats at all on your truck? I've heard spark plug defoulers with the ends drilled out will fool the computer, i had an oxygen sensor simulator last year before i put cats back in and it worked but didnt, it kept the light off but my ready codes for the oxygen sensor and cat wouldnt go ready. Any insight on that??

I actually just re-installed my cats and 02 sensors. I hard reset the computer, drove like a bat outta hell til my monitors turned off and parked it for the night. The next morning I hauled azz over to the smog shop and it passed!!! On the way home I got a CEL PO420 LOL!!

The 02 sensor actually measures how much oxygen it takes to burn off the fuel in the exhaust. I too have heard that pulling it out of the exhaust stream a little will fool it into thinking the cats are working better.

My smog guy said it barely passed. With the readings I was getting it was like the cats were going bad. I believe it was said above that the cats don't get hot enough to work correctly, I really think that is true.

I tried the URD 02 sim and it just made my computer throw a code saying the front 02's were bad???!!!! It's crazy how sensitive the Toyota computer is!! I'll try the antifouler one of these days.







So when you had the simulators on your truck the monitor wouldn't run?

 

[dirtydeeds]

Lol that happened to me last year, right after i left the smog shop the light came on, but it was just a freak coincidence because it was actually the heater element in one of my front A/F sensors that went bad, which actually screw my mpgs too because the sensor wasn't warming up enough to get an accurate reading.

haha, it's crazy how everything has to be just so and seems so complicated, and when it is just right how simple it all is over being having a carburetor.

But it's interesting what you said before: When you ran a simulator did the monitors for the rear 02 sensors never run?

 

[dirtydeeds]

No the monitors ran I guess just the simulator wouldn't do the right sequence that the computer wanted to see from the rear sensors, but it must have seen enough to not trip the light, I drove it like that for probably 800 miles with no light but with 2 not readys as well.

ya, seems when you run simulators they don't 'switch' as it would if it weren't being simulated. Plus I think that they have to switch in conjunction with the front sensors or it throws off the ECU and it gets mad. LOL

So here is where I get schooled: What do you mean by "not ready's"?