Audi A6 C5 2.4 V6 - Catalyst Issues, Error Codes 16814 P0430 & 16804 P0420, Car Drives Normally

Question

Hello, check engin was on. The errors that came out to me were 16814 P0430 and 16804 P0420
The car drives normally without any drops in power, I suspect the fault lies on the catalyst side, but I personally don't know it. Maybe you have any suggestions and hints, thank you in advance for your help.

szymitsu21 · Answer

If you can, please provide a description of the errors. The car has a gas installation?

kuba021 · Answer

Hello, To check the reading of the lambda probe

moto-kord · Answer

Can you enter the engine code?

Moraś · Answer

The car has no lpg installation, the diagnostician described it to me as a too poor fuel mixture. He also added that the probes work correctly, after resetting the errors, the check lit again after about 400 km.
The engine is AML 2.4 v6 165 km. Tomorrow I am going to take measurements of exhaust gases, I think it will allow me to determine if it is actually a catalyst.

moto-kord · Answer

P0420 Catalyst System Performance Below Threshold (Row 1) P0430 Catalyst system capacity below threshold (row 2) Exhaust gas analysis should help in further diagnosis.

ociz · Answer

And I think that the exhaust gas will still be within the normal range, unless a lot of oil is consumed, HC will be exceeded.

grala1 · Answer

Change the diagnostician because he has no idea what he is doing.
If it was a lean mixture, there would be other errors and would be based on the reading from the probes before the catalysts and not as it is here.

Three outputs:
- ignore the topic as you do not mind the light on the board
- replace the catalysts
- play in mounting sleeves between probes and catalysts

Moraś · Answer

So yes, I know for sure that I have two catalysts to exchange, I also know that I have four catalysts Two smaller just behind the collector (probably) and two larger at the back. behind the smaller ones there are probes in the front and behind the larger ones there are none. So I have to understand that these two smaller ones are to be exchanged because of them the reading from the court goes?

Moraś · Answer

I have eliminated errors related to executioners. I have two more errors that systematically pop up are:
- P1423 Bank 1. Secondary air system, flow too low
- P1411 Bank 2. Secondary air system, flow too low

Can you suggest where to start eliminating errors?

grala1 · Answer

I don't know how here, but usually there is a vacuum valve which gives a vacuum to the valve (similar to EGR) which feeds air pumped from the pump to the exhaust manifold to heat the catalyst faster.
There should be two here.
Maybe the solenoid valve doesn't open, maybe the vacuum hose is full of holes.
You must check that this valve opens.

Moraś · Answer

Is this a serious problem or can it be underestimated?

Moraś · Answer

Problem solved, vacuum hoses replaced and after trouble. Thanks for the hints.

Audi A6 C5 2.4 V6 - Catalyst Issues, Error Codes 16814 P0430 & 16804 P0420, Car Drives Normally

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