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Model specific boards => Golf mk4 => Topic started by: transitman on 22 January 2008, 12:50

Title: Mk4 1.6 16V
Post by: transitman on 22 January 2008, 12:50

Ok Hope you guys can help, my friend has a Mk4 1.6 16V on a 51plate!

It has the engine management light on and upon scaning it have this fault code come up:

16804 - Catalyst System: Bank 1: Efficiency Below Threshold
        P0420 - 35-00 - -

Now is this Catalytic converter related? The car has only done 63000miles

I have monitored the signal on VAGCOM and tried clearing the fault but it comes back after about 100miles

The signal I moinitored was in Block 1 which seemed fine, alot of fluctuation when revving the engine and driving which Im guessing is the probe in the manifold as it looks brand new.

The other signal I monitored was in block 6 i think of VagCom, this value only fluctuated from -2.0% - -3.0%

So from that I would say that there was something wrong there?? I need to find out if its the Cat or the Sensor....
What do I do next??


Thanks chaps.

Title: Re: Mk4 1.6 16V
Post by: GTi-Matt on 22 January 2008, 18:48

weather its the cat or the sensor u gotta replace them both idealy as the problem will reoccur again and then it just gets pricey, good luck tho

Title: Re: Mk4 1.6 16V
Post by: richw911 on 22 January 2008, 18:55

Quote from: transitman on 22 January 2008, 12:50

Ok Hope you guys can help, my friend has a Mk4 1.6 16V on a 51plate!

It has the engine management light on and upon scaning it have this fault code come up:

16804 - Catalyst System: Bank 1: Efficiency Below Threshold
        P0420 - 35-00 - -

Now is this Catalytic converter related? The car has only done 63000miles

I have monitored the signal on VAGCOM and tried clearing the fault but it comes back after about 100miles

The signal I moinitored was in Block 1 which seemed fine, alot of fluctuation when revving the engine and driving which Im guessing is the probe in the manifold as it looks brand new.

The other signal I monitored was in block 6 i think of VagCom, this value only fluctuated from -2.0% - -3.0%

So from that I would say that there was something wrong there?? I need to find out if its the Cat or the Sensor....
What do I do next??


Thanks chaps.

Oxegen sensor  :shocked: Have a look here:
http://wiki.ross-tech.com/index.php/16804/P0420/001056

Title: Re: Mk4 1.6 16V
Post by: transitman on 23 January 2008, 04:15

Cheers Guys,

Will play with the sensor later today...

How do I perform the aging check on a 1.6 16V? Obviously I have VAGCOM.

Cheers

Title: Re: Mk4 1.6 16V
Post by: transitman on 23 January 2008, 14:45

Carried out post cat ageing test and all was fine, what can I gather from this? Is the cat at fault?