P0430

Catalyst efficiency below treshhold ( Bank 2 )

This is the error that came up on the scanner. Could this also effect my poor fuel milage? It went to 300 mptank from previous 400mpt. I hear some vibrations in the cat at idle as well sometimes.

Opinions?

Thank you...

 

I have the same problem. Let me know if you resolve this.

 

check the o2 sensors i had the same code unfortunately i had already replaced the cats. and yes it could effect your gas mileage

 

u went 400 mpt?! wow how many gal. do u pump up? because i only go 280 and i thought my gas milage was good already. btw i my mpg is 18 in the city

 

you misread the post. i only get about 250 -270 per tank

 

mpt as in miles per tank

 

I agree with the O2 sensors as the most likely but it could also be a leak

 

A leak in your exhaust system or your cat.

 

how much did you pay to replace your cat

 

didn't buy one yet, or checked the car. too busy at this time.

 

You should also have your 02 sensors checked out. They might need to be replaced.

 

My 98 GS4 just threw the same code. Is this the pre or post O2 sensor?
car seems to run fine.
JimA

 

This cat would be right under the driver side. P0430 means that you have a bad/blown cat.

 

Code PO430 is for the cat or O2 on the pass side. It doesn't state pre or post.

 

It's post =]