Hi im new 97 4runner 2.7 has po420 code drives fine no vaccum leaks new oem 02 sensors and lce header and high flow cat installed like 60 thousand miles ago amy hell please

 

When you say new sensors just how new and what brand??

I get a random PO420 code on my 2000 Tacoma Still can`t figure out why.

It can go from a few hundred to a few thousand miles. i clear the code good for another random cycle.

As long enough the tests cycle a few times.

It code be your high flow cat is showing efficiency levels below the trip level

 

02 are like a month old it shows the code after about hundred miles after I reset the light the o2 sensors I think are reading pretty similiar in wave form the from is all wavy and the back is wavy too but not as much as the front but seem pretty close somtimes. So u think the cat is messing something uo and if so what suggesti I n to turn light off.

 

Oh rhe 02 sensors are densos

 

I can see now i need to wait till the coffee has been to my brain and back twice.

if the efficiency of the cat is below what The ECM says it should be it will trip the MIL

New cat or something to clean out the exhaust system but I have no personal experience using any.

 

Even being that new you think I should swap out the cat. I guess ill contact lce about warranty policy. Thanks