2005 Camry P0420 Code 36k miles

[jj1234]

I have a 2005 Camry with a P0420 code. I have replaced the downstream 02 sensor, catalytic converter. It has no exhaust leaks and the upstream 02 sensor resistance seems to be at spec. The Air fuel sensor resistance is at 2.8 ohms when cold. Could this be the problem?

[TRD VVTi]

Originally Posted by jj1234

I have a 2005 Camry with a P0420 code. I have replaced the downstream 02 sensor, catalytic converter. It has no exhaust leaks and the upstream 02 sensor resistance seems to be at spec. The Air fuel sensor resistance is at 2.8 ohms when cold. Could this be the problem?

What engine? What kind/brand of converter? Have you searched for any TSB's?

[njerald]

The voltage output of the air fuel sensor is the first thing that should have been checked before a wholesale replacement of parts but that's how some troubleshoot.

[jj1234]

the engine is a 2.4, aftermarket converter really don't know the brand. I couldn't find any TSB's. What should the voltage output of the Air Fuel sensor be?

[njerald]

The troubleshooting steps are in your Factory Service Manual.........

[Luna2]

FYI



http://www.camrystuff.com/

[sniper34]

Help him out, give him the voltage. If I had it I would. He's looking for help and not what he should have done.

[TRD VVTi]

How many miles are on it?

There are a few threads about this subject. Try the search function. I found several that even listed the TSB's with the proper specifications and diagnostic procedures.

If you had checked the "Newbies please read before posting!" sticky at the top of this forum you would know how to do a search and find the information you need without having other people do it for you. Give it a try.

Aftermarket converters suck, you should have went with OEM parts. The same thing goes with O2 sensors.

[njerald]

Originally Posted by sniper34

Help him out, give him the voltage. If I had it I would. He's looking for help and not what he should have done.

It's not that easy, noob.

[TRD VVTi]

I just saw the 36K. The converter is under federal emissions warranty for 8 years or 80,000 miles! You can't get one now though...

[sniper34]

Originally Posted by njerald

It's not that easy, noob.

Oh, I see. The number of post's determine if your opinion counts. Well I guess I'll have to post meaningless replies to get the number higher. What is the number have to be so you don't call someone "noob"?

[somick]

Originally Posted by sniper34

Oh, I see. The number of post's determine if your opinion counts. Well I guess I'll have to post meaningless replies to get the number higher. What is the number have to be so you don't call someone "noob"?

His favorite one is "SIMPLY AMAZING..." Wait and you will get one too...

Sam

[jj1234]

What i had to do to get this fixed was:
1. fix an exhaust leak
2. change the air fuel ratio sensor because it was faulty
3. change the front catalytic converter (according to dealership catalytic converters and exhaust gaskets go out a lot here in Arizona due to the extreme heat.)

I was recommended to put chevron or QT gasoline to prolong the life of the cat and fuel components.

[new echo owner]

You will need a scan tool to read the A/F sensor reading, normally it will fluctuates around 3.3 v +/- 0.05v at idle and at steady throttle. P0420 is for bank 1 cat efficiency below threshold, I think; however, if the Bank 1 Sensor 1, A/F is not functioning properly, it will actually trigger that code set because it is pump too much fuel through the system. The usually step would have been record and clear the code, reset the ECM memory, and monitor the A/F sensor and fuel trim readings.

By the way, where was the exhaust leaking at? Before the A/F sensor or after? This is the first time I heard about the outside temperature affecting the longevity of the cat.

N.E.O.

[jj1234]

The exhaust leak was after the A/F sensor, but before the first O2 sensor. Where the front cat and the exhaust pipe meet. Maybe the cat went out because the A/f sensor was delivering to much fuel.