I checked my 2001 Octy 1.8t 4x4 estate today with VagCom and got 9 codes! The codes were cleared last friday when it was re-mapped so they are all current/new codes.

The codes i have are:

00526 - Brake Light Switch (F): Implausible Signal

Possible Causes

Wiring/Connectors from/to Brake Light Switch (F) faulty

Brake Light Switch (F) faulty

00667 - Ambient Temperature Signal: Implausible Signal

Possible Causes

Wiring and/or Connector(s) from/to Instrument Cluster (J285) faulty

Wiring and/or Connector(s) from/to Ambient Temperature Senor (G17) faulty

Ambient Temperature Senor (G17) faulty

00779 - Outside Air Temperature Sensor (G17): Open or Short to Plus

Possible Symptoms

In the Instrument Cluster you see dashes (---) instead of a temperature

Possible Causes

Wiring between Outside Air Temperature Sensor (G17) and Instrument Cluster: Open or Short Circuit

01314 - Engine Control Module: No Communications

Possible Causes

CAN-Databus Wiring/Connectors from/to Engine Control Module faulty

Fault(s) stored in Engine Control Module

Engine Control Module recently flashed or re-mapped

01330 - Central convenience module: No communication Interittent (not on the RossTech wiki)

01336 - Data Bus for Comfort System: Faulty

Possible Causes

CAN-Data Bus faulty

Wiring/Connectors from/to Control Modules

Control Module in CAN Data Bus Comfort faulty

16955 - Brake Light Switch (F): Implausible Signal

Possible Symptoms

Malfunction Indicator Lamp (MIL) active

Brake Light(s) not working

Possible Causes

Wiring and/or Connectors faulty

Fuse(s) faulty

Wrong Brake Light Bulb installed (21W instead of 5/21W)

Brake Light Bulb(s) faulty

Brake Light Switch (F) faulty

17608 - Boost Pressure Control Valve (N249): Mechanical Malfunction

Possible Symptoms

Malfunction Indicator Light (MIL) ON

Power Loss

Possible Causes

Boost Pressure Control Valve (N249) faulty

Diverter Valve faulty

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

Possible Symptoms

Malfunction Indicator Light (MIL) ON

Power Loss

Possible Causes

Leaking Hoses and/or Pipes between Components

Boost Pressure Control Valve (N249) faulty

Diverter Valve faulty

Throttle Body dirty

So my thoughts are:

1 - My outside temp sensor(G17) is dead or not plugged in. Anybody know where it is?

2 - My Brake light switch is a bit dodgy although my brake lights work when i check them, is the switch on the pedal?

3 - My D.V. needs replacing( been re-mapped so may not by coping well with increased boost)

4 - My Central Convenience Module is playing up( see my other thread)

If you're getting lots of electrical faults (including ones that point to CANBUS errors) it might be worth checking over the earths first, especially inside the plenum chamber.

I'm currently in the process of sorting through a mess of wires that used to be a loom in the boot which i think is causing the electrical problems including the CCM, CANBUS faults and Brake light switch, hopefully will be sorted tommorow.

EDIT: The electrical problems are in another thread

Edited 23 April, 201115 yr by 4x4 1.8t Octy