Well my 1997 Z28 just set a code today I have p0420 witch comes back to "Catalyst System Efficiency Below Threshold (Bank 1)"
I have also been having a code p0410 that comes back to my smog pump witch seams to be replaced.
Now I need some help here on the p0420 code bank one is the drivers side?
If it is then is it the O2 sensor or is there a down stream O2 sensor on the drivers side like there is on the passenger side.
Or is it the converter on the drivers side?
Thanks,

 

P0420 sets when the after-cat O2 sensor on the driver's side indicates that the catalytic converter is not performing correctly (low oxygen storage). That can be caused by several problems:

-dead cat
-faulty O2 sensor
-faulty wiring to the sensor

Swap the two after-cat O2 sensors side-to-side - that will tell you which one is the problem. If the problem/code moves with the sensor (P0430), its a faulty sensor. If the problem stays on the driver's side (P0420) its most likely the cat, but you should check the wiring as well.

 

Thanks
I will have to do that tomarrow it's to dam cold for me 54F out in west palm beach florida.

 

No sympathy on the temperature... It was 13*F driving to work this morning, in NJ, with a 20mph wind.

 

Predicted wind gusts of 75-85 MPH here with snow accumulation of up to 2-4 feet...

 

-5 this mornin with a foot of snow on ground

 

I heard it was "so cold" in West Palm Beach this week a few people were actually seen wearing long pants! Burrrrrr!

WD

 

Yup you got that right.