Mk4 1.6 16V

[transitman]

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.

[GTi-Matt]

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

[richw911]

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

[transitman]

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

[transitman]

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