VW Polo TDi - Warning Lights

VW typically uses a timer relay to shut off the indicator light. A second relay should interrupt current to the glow plugs after the motor start6s and the starter is disengaged. The control unit can sense of the second relay is stuck (contact points welded shut). The high current draw will burn out the glow plugs, can drain the battery below something like 8 vDC and the control unit and motor will no longer run.

Bob

Thanks for the response.

Took the car to a mate who has the latest diagnostic tools - the fault code was for a speed (rpm) sensor failure. This had only occured once and may well be spurious. He re-set the system and all appears well.

An interesting thing is that apparently if the brake light switch fails (which is not uncommon in these cars according to the agents) this also results in the glow plug sign flashing.