I would prefer if you had an imitation ross-tech.com scanner. The vag-com
scanner tool copies can be had from Ebay for under $30 and will tell you
more than a generic OBDII code reader. AND allows you to do MORE! ;-)
More like Throttle Body Adaptations, read information from the ECM like
coolant temperature and 02 sensor readings, troubleshoot problems by testing
some components independently and get more info with the DTCs.

Let us know how the 02 sensor works out for you. 57,850 is low mileage for
the 02 sensor and it might have been under warranty if the vehicle was less
than 7 years old and under 70,000 miles. I believe you just missed out by 1
year. :-(
I dislike guessing since it costs too much. :-(
--
later,
dave
(One out of many daves)

> wrote in message
ps.com...
> 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.
>
>