ODBC Codes on VW Golf MKIV

golfbgud

Hi All,

Investigating an issue with a friend on a '00 1.4 MKIV Golf with over 100k miles.

Coming up with the following:

16804 and 16518

Any clues? I did pull the code descriptions off the web but there's a lot of possibilities there (most are CAT related).

Thanks.

spiggotpaddy

16518 P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected
16804 P0420 Catalyst System,Bank1 Efficiency Below Threshold

looks like you need a new o2 sensor

golfbgud

spiggotpaddy wrote: »

16518 P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected
16804 P0420 Catalyst System,Bank1 Efficiency Below Threshold

looks like you need a new o2 sensor

Sorry - I should have mentioned that the O2 sensor was already replaced!
(Unless it's gone faulty already)?

McP2011

It could be an o2 sensor/wiring...what is the car running like?

spiggotpaddy

were the fault codes cleared, after the new sensor was fitted. and as already said hows the car running, whats the problem?

tossy

As paddy said the fault codes could be left overs from the old sensor,have the been reset since? was the sensor you fitted new/second hand/genuine/spurious?

golfbgud

Sensor was new.
Codes were all cleared (twice).
Starts and drives but dies the odd time (and recovers).....
I believe that it was a genuine sensor but will double check over the week-end.

spiggotpaddy

have you had the throttle body cleaned? only takes a few minutes, could be lucky.