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¡Hola, y bienvenidos Sólo a Respuesta!
Que pregunta hacen usted tiene. Sólo digo el inglés, pero yo usando a un traductor de Internet, tan perdóneme si algo parece extraño.
Here the circuit descpiption fromt he service manual.
CIRCUIT DESCRIPTION Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim includes short-term fuel trim and long-term fuel trim.Short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at its ideal theoretical value. The signal from the heated oxygen sensor indicates whether the air-fuel ratio is RICH or LEAN compared to the ideal theoretical value, triggering a reduction in fuel volume if the air-fuel ratio is rich, and an increase in fuel volume if it is lean.Long-term fuel trim is the overall fuel compensation carried out over the long-term to compensate for continual deviation of the short-term fuel trim from the central value due to individual engine differences, wear over time and changes in the usage environment.If both the short-term fuel trim and long-term fuel trim are LEAN or RICH beyond a certain value, it is detected as a malfunction and the MIL lights up.
What you will be look ing for is a lean condition on the bank #1 side which is the side that has cylinders 1,3,5 (see below)
Things that will cause this are vacuum leak, low fuel pressure, stopped injector, or bad O2 sensor. You will need to determine what is causing the problem and repair it as needed.
If can help any further please let me know.
2003 Jetta left rear window blue plastic part of the