Gentlemen, I need some recommendations on good hands that can troubleshoot these codes for me - P0420 and P0430. This has to do with one or more of the following:

Exhaust leakage
Catalyst failure
Air/fuel sensor
Hot oxygen sensor
Gas tank cap leakage

It is a Toyota 2GR-FE Engine so, I need a proper diagnosis to avoid throwing parts at it randomly. Many functions of the small SUV have been shut down because this code illuminated the MIL light. (It is a 2007 Rav4). Total service station confirmed that the exhaust system has no leakage, but when their tech leader included the injectors as possible culprit, I had to leave there.

I saw an advert by ARS here on Nairaland claiming to offer professional repair services. Anybody knows about them?

Thanks in advance.

Kashif:
Gentlemen, I need some recommendations on good hands that can troubleshoot these codes for me - P0420 and P0430. This has to do with one or more of the following:

Exhaust leakage
Catalyst failure
Air/fuel sensor
Hot oxygen sensor
Gas tank cap leakage

It is a Toyota 2GR-FE Engine so, I need a proper diagnosis to avoid throwing parts at it randomly. Many functions of the small SUV have been shut down because this code illuminated the MIL light. (It is a 2007 Rav4). Total service station confirmed that the exhaust system has no leakage, but when their tech leader included the injectors as possible culprit, I had to leave there.

I saw an advert by ARS here on Nairaland claiming to offer professional repair services. Anybody knows about them?

Thanks in advance.

Seems you have lost both catalysts.
Bank1/2

GAZZUZZ:

Seems you have lost both catalysts.
Bank1/2

That is my fear, but i will need some confirmation....

Only way to check is to drop the exhaust it self. If no catalyst there then your 4 02 sensors are as good as gone too. But you can still test them nevertheless

mayor2013:
Only way to check is to drop the exhaust it self. If no catalyst there then your 4 02 sensors are as good as gone too. But you can still test them nevertheless

Bad or none existent catalyst cannot possibly kill air/fuel sensor, given that they sit before the catalyst, and are in no way connected. I am not sure about the HO2 sensors, but the same should apply. Thanks for your input anyways....

Is there anyone who could help with a reference please?

Kashif:


Bad or none existent catalyst cannot possibly kill air/fuel sensor, given that they sit before the catalyst, and are in no way connected. I am not sure about the HO2 sensors, but the same should apply. Thanks for your input anyways....

Is there anyone who could help with a reference please?

Dont forget they play same role and when 1 goes bad there is a faster tendency for the rest to go bad too quick

aieromon:
https://www.nairaland.com/951734/explaining-catalysts-catalyst-codes

Thanks a lot man! I followed the thread when it was created, but have since forgotten. Thanks again.