Todo esto apunta a caudalimetro defectuoso.
En el ultimo párrafo te he copiado un texto de la web de Rosstech, donde se describe lo que es "trim"
A grandes rasgos, es un ajuste de la mezcla de combustible según lo demandado por la ECU, en base a la información suministrada por el caudalimetro y el sensor de O2 (sonda Lambda) del sistema de escape.
Ya que te da fallos tanto de mezcla muy rica (too rich) y muy pobre (too lean), la primera impresión es que es el cauda.
Te traduzco parte de los fallos:
17924/P1516/005398 - Intake Manifold Valve (N156): Open Circuit
Causas
Cableado o valvula del multiple de admision defectuosos (N156)
Soluciones Posibles
Comprobar/reemplazar valvula (N156)
Hacer un Output Test (VAGCOM)
18001/P1593/005523 - Altitude Adaptation: Signal Out of Tolerance
Sintomas: La ECU sabe que algo esta mal, pero no puede decir donde
Causas
Sensor MAF (G70) fuera de tolerancia (caudalimetro)
Fuga en la admision
Sensores de posicion del acelerador fuera de tolerancia (G187/G188)
Soluciones Posibles
Comprobar/reemplazar caudalimetro (G70).
Comprobar fugas
Comprobar Sensores de posicion del acelerador (G187/G188)
16514/P0130/000304 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
Possible Causes
Oxygen (Lambda) Sensor Heating Bank 1 Sensor 1 faulty
Possible Solutions
Check Oxygen (Lambda) Sensor Heating Bank 1 Sensor 1
17545/P1137/004407 - Fuel Trim: Bank 1 (Add): System too Rich
Possible Symptoms
Malfunction Indicator Light (MIL) active
Possible Causes
Mass Air Flow (MAF) Sensor faulty
Fuel Pressure Regulator faulty
Fuel Injector(s) faulty
Oxygen Sensor Control faulty
Oxygen Sensor(s) faulty
Evaporative Emission (EVAP) System faulty
Possible Solutions
Check Mass Air Flow (MAF) Sensor
Check Fuel Pressure Regulator
Check Fuel Injector(s)
Check Oxygen Sensor Control
Check Oxygen Sensor(s)
Check Evaporative Emission (EVAP) System
17536/P1128/004392 - Fuel Trim; Bank 1 (Mult): System too Lean
Possible Symptoms
Malfunction Indicator Light (MIL) active
Possible Causes
Mass Air Flow (MAF) Sensor faulty
Oxygen Sensor Control faulty
Oxygen Sensor(s) faulty
Fuel Injector(s) faulty
Possible Solutions
Check Mass Air Flow (MAF) Sensor
Check Oxygen Sensor Control
Check Oxygen Sensor(s)
Check Fuel Injector(s)
Cambia tu cauda y/o has un log de tu coche, de ahi sabremos que falla.You can check your current state of trim by using VAG-COM or equivalent to look in Group 032 (in many modern ECU's, consult your Factory Repair Manual for the specific group for your particular vehicle) in your engine measuring blocks. The first two fields will have percentages. The first field tells the fuel trim at idle (Additive). The second field tells the fuel trim at elevated engine speeds (Multiplicative). Negative values indicate that the engine is running too rich and oxygen sensor control is therefore making it more lean by reducing the amount of time that the injectors are open. Positive values indicate that the engine is running too lean and oxygen sensor control is therefore making it richer by increasing the amount of time that the injectors are open.
It is totally normal for both the first and second fields to be something other than zero. In fact, zeros IN BOTH FIELDS indicates that either you just cleared codes (which will reset fuel trim values) or something isn't working properly. If values get too far away from zero, it will cause a DTC (fault code) and can set off the MIL (commonly referred to as the Check Engine Light, or CEL). Specifications for normal operation are usually somewhere near +/- 10%.
In general, an out-of-spec value in the first field (Additive) indicates a vacuum leak since it is mostly present at idle, when vacuum is highest. An out-of-spec value in the second field (Multiplicative) indicates a fault at higher RPM, and may point to a faulty MAF.
S2