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Volkswagen Jetta, Golf, GTI: 1999-2005, R32: 2004 (A4) Code 16804 / Which should I replace? Catalyst or O2 Sensor?


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Last Post: Feb 14, 2014 5:33 PM Last Post By: 1KperTank
kerly900

Posts: 28
Registered: 12/28/10
Code 16804 / Which should I replace? Catalyst or O2 Sensor?
Posted: Jan 4, 2014 12:22 PM
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Hi fellows,

I just got Code 16804 on my Jetta Mk.4 (2003):

1: Efficiency Below Threshold.

How can I know if is the Catalyst or the O2 Sensor which is going bad?
Is there any test available with the VAGCOM or following some steps to determine what should I replace?

Thanks!
kerly900

Posts: 28
Registered: 12/28/10
Re: Code 16804 / Which should I replace? Catalyst or O2 Sensor?
Posted: Jan 6, 2014 6:10 PM   in response to: kerly900 in response to: kerly900
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Hi fellows,

I found a tutorial somewhere in the web to test the O2 Sensors (Pre-Cat and Post-Cat) and the Catalyst with VAGCOM.
It was very helpful and I discovered that my Catalyst was not OK, so I think may be some one can take a look of it:

Let me know if you have any issues when applying this tests.

1KperTank

Posts: 1
Registered: 02/01/13
Re: Code 16804 / Which should I replace? Catalyst or O2 Sensor?
Posted: Feb 14, 2014 5:33 PM   in response to: kerly900 in response to: kerly900
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Will this procedure apply to the BEW TDI pre cat sensor ?

My car is throwing a fault code 18628 Sensor B1S1
P2196 - 000 - Signal too High ( Rich )

Lambda 10.9%

+++++++

255.0 mg/str Exhaust Gas Recirculation ( spec)
255.0 mg/str Exhaust Gas Recirculation (Actual )

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