I have a brand old Subaru that will not pass NJ inspection because of a [ P 0420 Cat efficiency bank 1 ] code from the engine light being on.

A mechanic friend and 3rd party who work at Subaru suggested I replace the whole Cat system, front and rear to clear codes and start fresh.  Car has 232K miles.  Must clear codes to pass inspection in NJ.

What is the best after-market value considering quality and price over the OEM list.  I have seen the whole unit for around $250, and as much as $1014.  I'll probably buy what you tell me to, so advise well!  The car run extremely well, and I only paid $675, so there is a little budget to get her to another 100K

Thanks so much, Erik

Hi Erik--welcome to USMB.  Frankly I think most of us would disagree with replacing "the whole Cat system!"

 

But suggest you re-post your questions in the Newer Generation forum--you'll get more exposure and a better chance of helpful responses there.

on a scale of 1 to 10,

the chances that the cats are bad would be a 1, or very, very, very, low.

 

generally the p0420 can be cured byu a new front o2 sensor,

it should be a subaru quality part or BETTER.

any cheap aftermarket part will not work.

 

the next step,

assuming that does not work,

is a replacement rear o2 sensor.

that one can be more generic.

 

usually this clears the p0420 problem.

 

if it does not,

ask about the ''anti-fouler fix''

it will work.

 

save your money,

do not buy new cats.

Edited October 9, 201510 yr by johnceggleston

FANTASTIC ADVICE!!! Thanks so much.

 

I'll start with the O2 sensors and work in that order. Much obliged.