Question about Volkswagen Cars & Trucks
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Posted on Jan 02, 2017
Upstream Heated O2 Sensors Swapped
P1128..means that you should check your O2 sensors...upstream...just before or after the catalyst....
Could be the air filter or prescreen, Mass Airflow Sensor needs cleaning, Fuel Pressure Regulator needs testing, Fuel Pump, IAC valve needs cleaning or either O2 sensor needs replacing...but most of the time it's O2 sensor problem....cheers
Posted on Feb 03, 2018
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