I own a 97 subaru legacy 2.5 gt and i got that code po420 catalyst efficiency below threshold .what does that mean and what can I do ?thanks

Start by searching for P0420 here.

 

Read a few threads.

I am sorry I am new to USMB .i love the site .I wish i new about this 2 months ago .thanks alot:)

I own a 97 subaru legacy 2.5 gt and i got that code po420 catalyst efficiency below threshold .what does that mean and what can I do ?thanks

 

typically it's the front o2 sensor, buy a subaru sensor only.

I am sorry I am new to USMB .i love the site .I wish i new about this 2 months ago .thanks alot:)

 

No worries. I often have trouble finding what I'm looking for with search but this code is often asked.

 

There is an awful lot of excellent information here and good folks as well.

How many miles are on the car?...As suggested I would throw a front 02 in it...You dont want to go spending $500-$1000+ dollars on something a new sensor could fix....Of course you could always try clearing the code and see if it comes back...

I changed both o2 sencers .and un did the battery and now light on yet .I think i am going to get some carb cleaner and clean my throdel body