2011 Tahoe/hollowed catalytic converters

[seakone]

2011 Tahoe Lt 5.3 4wd
recently bought this vehicle and come to find out all 3 catalytic converters are hollowed out I had changed all 4 oxygen sensors because I had permanent code p0430 and p0420 codes SUV runs fine and all I can even pass smog inspection no check engine light I can remote start it I'm just wondering how the hell can it pass smog and why no check engine light ?

 

[Tonyrodz]

The codes cleared once you changed the O2's?

 

[seakone]

The codes cleared once you changed the O2's?

nope "permanent codes" are still there as seen in screenshot but no dtc lights or anything I just want to know how the heck it passes smog and no dtc lights ?

 

[tom3]

I wonder if someone put a special tune on it? Is that even possible? Are you sure all cats are straight thru? Does the light come on at the startup test cycle?

 

[seakone]

I wonder if someone put a special tune on it? Is that even possible? Are you sure all cats are straight thru?

yes cel light does work it has been on and I see it on as I turn the key and I'm convinced and old dude has owned this Tahoe I have changed a few things and most engine parts are still oem and Tahoe was nicely kept even bulbs all still yellow, and even if the cel light wouldn't work I wouldn't pass smog I was thinking some type of tune but I highly doubt that

 

[iamdub]

yes cel light does work it has been on and I see it on as I turn the key and I'm convinced and old dude has owned this Tahoe I have changed a few things and most engine parts are still oem and Tahoe was nicely kept even bulbs all still yellow, and even if the cel light wouldn't work I wouldn't pass smog I was thinking some type of tune but I highly doubt that

It was probably tuned to "not report". The PCM will still monitor things and record fails, but you can tune it to report after X number of fails or to not report at all or to report but not illuminate the CEL. I think those are the options, anyway.

 

[Dustin Jackson]

2011 Tahoe Lt 5.3 4wd
recently bought this vehicle and come to find out all 3 catalytic converters are hollowed out I had changed all 4 oxygen sensors because I had permanent code p0430 and p0420 codes SUV runs fine and all I can even pass smog inspection no check engine light I can remote start it I'm just wondering how the hell can it pass smog and why no check engine light ?

@seakone What state you in?

 

[seakone]

@seakone What state you in?

texas

 

[Dustin Jackson]

@seakone I been thinking about doing this but I am in California, I heard over here they don't test the exhaust its all computer based these days. Is that how the Texas smog is?

 

[seakone]

@seakone I been thinking about doing this but I am in California, I heard over here they don't test the exhaust its all computer based these days. Is that how the Texas smog is?

yes they hook up OBD2 to computer and a adapter to gas tank cap if any check engine light or "evap leaks" you don't pass