Code P0430

[Boddney]

Hi gang,

A little advice please. I have code P0430 Catalyst Working Below Efficiency Bank 2. Can anything be done i.e Italian tune up, or is a new Cat required?

Thanks,

Bod

[AmbroseJohn]

Don't Panic. More often than not it's a sensor failure rather than a component failure. You just get the error because the computer is not receiving data from the faulty sensor.  

[Boddney]

Ah ok John, which sensor should I be looking for. Here's the history.

When I bought the car back in August, the CEL was on and my code reader showed 1 fault that being Bank 2 Sensor 1 oxygen sensor heating element not working.

Like a numpty, I left it until now to change the sensor. I plugged the reader in to confirm I was changing the correct one, only to find I had two codes. I changed the sensor and cleared the codes and started up and the CEL stayed off. Then after 10 miles today the CEL came on again with code P0430.

Bod.

[AmbroseJohn]

4 minutes ago, Boddney said:

Ah ok John, which sensor should I be looking for. Here's the history.

Bod.

You'll have to find someone clever to tell you that, which I'm afraid is not me. :)

[Verbout]

I believe leaving O2 sensors "for another day" is not good practice.

Try this site for engine code diagnostics. Read carefully before you start parts swapping.

http://www.autocodes.com/p0430_lexus.html

[Boddney]

Thanks Garry.

I know, it was silly really. I only left it because the sensor itself was still working when warm as only the heater element was broken. Lesson learned.

Here we go again with trying to second guess a rectification path.

Bod

[Britprius]

P0430 = catalyst bank2 below threshold.

There is a bodge fix for this. If you disconnect the Bank2 O2 sensor wire where it goes into the ECU and connect this input to Bank1  O2 sensor the system sees a good input for both banks "the Bank 1 sensor", and regulates the fuel accordingly. 

Replacing the O2 sensor for Bank 2 is the correct course of action if the problem still exists the cat is suspect. A cat cleaner and a fast run "may" cure this.

John

[Boddney]

That's great John. I didn't even know that cat cleaner existed. I'll get some tomorrow and go for thrash. Seems like a good place to start.

I changed sensor 1 already. I may have to spend another £35 on another one. Lexus wanted £180 for one. LOL.

Thankyou.

Bod