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#1
March 8th 07, 05:33 PM
posted to rec.autos.makers.vw.watercooled
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1999 VW Jetta engine codes
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. 
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