Hi trying to cure Kangarooing Polo 05reg 12 valve 1.2cc swapped coil packs replaced plugs, fuel filter, cleaned EGR valve with Carb cleaner, also cleaned throttle body in situ, slight improvement for 30 miles or so, but now wont accelerate, plugs sooting up, jet black and sooty but not wet, gave in and bought fault code reader off EBAY, 3 codes read 17811 16490 and 16891 anyone help with the first 2 codes that are not listed in my code reader book I'm thinking the fault lies in the EGR valve but according to Haynes manual if the EGR is replaced with a new one it has to be programmed at a VW dealers,anyone know any different.

thanks

17811/P1403/005123 - EGR System: Regulation Deviation

Possible Causes

Exhaust Gas Recirculation (EGR) faulty

Exhaust Gas Recirculation (EGR) Valve (N18) faulty

Possible Solutions

Check Exhaust Gas Recirculation (EGR)

Check Exhaust Gas Recirculation (EGR) Valve (N18)

Perform Output Test

16490/P0106/000262 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal

Possible Symptoms

Erratic Idle

Possible Causes

Wiring and/or Connections from/to Manifold/Barometric Pressure Sensor (G71)/(F96) faulty

Leak in Air Intake and/or Exhaust

Manifold/Barometric Pressure Sensor (G71)/(F96) faulty

Engine Control Module faulty

Possible Solutions

Check Engine Control Module Software Version

See Special Notes for Details

Check Timing

See Special Notes for Details

Check Wiring and/or Connections from/to Manifold/Barometric Pressure Sensor (G71)/(F96)

Check for Leak in Air Intake and/or Exhaust

Check/Replace Manifold/Barometric Pressure Sensor (G71)/(F96)

Check/Replace Engine Controle Module

16891/P0507/001287 - Idle Control System RPM: Higher than Expected.

Possible Symptoms

Malfunction Indicator Lamp (MIL) active

Possible Causes

Throttle Valve Control Module (J338) dirty/faulty

Wiring/Connector(s) from/to Throttle Valve Control Module (J338)

Vacuum Leak

Possible Solutions

Check Throttle Valve Control Module (J338)

Check Wiring/Connector(s) from/to Throttle Valve Control Module (J338)

Check Intake System for Leaks

Edited 24 August, 201214 yr by bartek

17811/P1403/005123 - EGR System: Regulation Deviation

Possible Causes

Exhaust Gas Recirculation (EGR) faulty

Exhaust Gas Recirculation (EGR) Valve (N18) faulty

Possible Solutions

Check Exhaust Gas Recirculation (EGR)

Check Exhaust Gas Recirculation (EGR) Valve (N18)

Perform Output Test

16490/P0106/000262 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal

Possible Symptoms

Erratic Idle

Possible Causes

Wiring and/or Connections from/to Manifold/Barometric Pressure Sensor (G71)/(F96) faulty

Leak in Air Intake and/or Exhaust

Manifold/Barometric Pressure Sensor (G71)/(F96) faulty

Engine Control Module faulty

Possible Solutions

Check Engine Control Module Software Version

See Special Notes for Details

Check Timing

See Special Notes for Details

Check Wiring and/or Connections from/to Manifold/Barometric Pressure Sensor (G71)/(F96)

Check for Leak in Air Intake and/or Exhaust

Check/Replace Manifold/Barometric Pressure Sensor (G71)/(F96)

Check/Replace Engine Controle Module

16891/P0507/001287 - Idle Control System RPM: Higher than Expected.

Possible Symptoms

Malfunction Indicator Lamp (MIL) active

Possible Causes

Throttle Valve Control Module (J338) dirty/faulty

Wiring/Connector(s) from/to Throttle Valve Control Module (J338)

Vacuum Leak

Possible Solutions

Check Throttle Valve Control Module (J338)

Check Wiring/Connector(s) from/to Throttle Valve Control Module (J338)

Check Intake System for Leaks

Thanks for your input regarding fault codes.

Polo eventually became totally undriveable so I had to tow it to a local non VW garage as VW couldn't even look for two weeks and I ran out of time,anyway local garage read faults code on their machine which only pulled up one code rather than the three that my Ebay reader found, which resulted in the Maf sensor being replaced to no avail,as car still wouldn't start,garage finished up replacing Catalytic converter which was apparently virtually blocked and exhaust system,Car now back with new Cat and Exhaust seems to be running Ok though exhaust seems to have a more sporty rasp to it, cant really understand why a cat should need replacing at 36,000 though or maybe that's what happens when a car is continually used for cold start 3/4 mile journeys.