What needs to be repaired or replaced? Car has 110,000 mi.

 

Could be either the cat or the 2nd O2 sensor. At 110K miles, I'd say it's about 50/50 as to which is the problem. I would probably replace them both.

 

cat or o2. you need to have them checked out.

 

Thanks. Where is the o2 sensor? If I try to solve the problem by trial and error, I think it would be a lot cheaper to first replace the 02 sensor. I think that was replaced on my daughters Celica at $60 or so.

 

Just behind the cat, tapped into exhaust pipe. You are correct, they are about $60ish

 

Thanks for the info. To order the part, what should I ask for?

 

ahhh... P0420 codes.

Its your Catalytic Converter. replace it.

if you had a problem with either of your o2 sensors, the ECU would store a hard code on it as well.

 

Just examples :
Catalytic Converter - $116.99 http://www.partsamerica.com/pr...Set=A
Secondary O2 Sensor - $ 73.99 http://www.partsamerica.com/pr...Set=A

 

Thanks. You have been most helpful.

 

Thanks to you all.

 

umm, i had that error on my old accord and they replaced the EVAP canister.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TruNinja619 &raquo;</TD></TR><TR><TD CLASS="quote">ahhh... P0420 codes.

Its your Catalytic Converter. replace it.

if you had a problem with either of your o2 sensors, the ECU would store a hard code on it as well.</TD></TR></TABLE>
not so. The o2 can become biased but the ecu will think that it is functioning normally and that the cat is at fault.

 

check my sig...

in my case I am running *rich* I think (valve stems/seals leaking) and getting a new cat would just cook it so I did this as a substitute to just get the CEL off.

 

My 98 Prelude has the same code. I was wondering, if you fixed that problem. What was the problem? The o2 or the catalyst system?


Thank you,
Jack Yang

 

Haven't been able to get out the o2 sensor. I assume it has been on the car for the last 10 yrs. I put a lot of muscle on it(albet while lying on my back) but could not get it to budge.