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Old March 9th 07, 02:08 PM posted to rec.autos.makers.vw.watercooled
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Default 1999 VW Jetta 2.0 engine codes

On Mar 9, 12:02 am, "dave AKA vwdoc1" > wrote:
> That P1128 code would lead me to believe that there is a vacuum leak.
>
> What is the mileage?
> The 02 sensor will get sluggish as it gets older. It could possibly solve
> your problems.
>
> Are you using a tool like the ross-tech.com scanner? AFAIK It will allow
> you to see what the 02 sensors are doing. It should also give you a little
> more info on those codes too! ;-)
> I would want to check the Coolant Temperature that the ECM sees though.
> --
> later,
> dave
> (One out of many daves)
>
> > wrote in message
>
> ups.com...
>
>
>
> > Looking for opinions, I have an issue where the check engine light is
> > coming on. I recently gave the car a tuneup which cleared the misfire
> > codes it had, but now (1 week later), I have the following codes
> > present:

>
> > P1128 Long Term fuel trim too lean
> > P0172 System Too Rich
> > P0134 Oxygen Sensor Circuit - no activity detected (pre-converter
> > sensor)

>
> > I am guessing that the O2 sensor needs to be replaced, but will this
> > also fix the other codes? I haven't detected any vacuum leaks that
> > might be suspect. Any help would be appreciated. Thanks.- Hide quoted text -

>
> - Show quoted text -


The mileage is only 57,850 miles. The scanner I'm using is an Actron
OBD II scanner. I'm going to change the O2 sensor later todat and see
if that works. Thanks.


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