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ssiebor14

ssiebor14

New member
P0420 catalyst efficiency bank 1. What doesthis mean. Plus abs light came on out of no where there is a loud humming whenever I get up to 50 mph and whenever I brake there sounds like there's rubbing noises or like is rubbing the bumper but it's not. Help?
 


http://www.obd-codes.com/p0420 could be a bad cat, or o2 sensor. hows the car running? is it gut less or feel down on power?

the abs light is a bad hub, same for the hum sound. jack each wheel one by one up lugs tight, then push and then pull the top of the tire, if it moves you found your bad hub.
 
I've dine the hub. None are bad. And it feels down on power I gutted the cat already so it might need the 02
 
The code threw before I gutted it and the hum sounds like a roar only at 50 to 60 then stops. But I have 98 gtp sc
 


the roar could also be a bad tire. try rotating the fronts to the back, maybe you can hear it move.

and the code, now you have no cat, so unless you get the rear o2 sensor tuned out, your gonna have that code forever, or put a cat back on.
 
take the plugs off all the hubs, clean and grease them, while your there, check the wires to each hub for damage.

if you cant find anything still get it scanned, your at the end of the free checks. the speed sensor can and do go bad in a good hub. most of the time the hub being bad throws the abs sensor off and trips the light.
 


for the p0420...a cheap fix that may work is to install a spark plug anti-fowler in the 02 bung and then re-install the rear 02. it will shield the rear 02 from the exhaust stream enough to keep the front and rear cross counts from setting the dtc.

Best fix is new cats. if you go that way don't buy cheap cats. The basement line cats have low cerium content (the oxygen storing element in the cats) which will set the p0420 right from new.
 
Will do Scotty thank you for your help and I will do that I don't have money for a new cat right now so I straight piped it
 
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