glow plug light flashing all the time

[kwak lad]

i am in need of any help and advise from anyone ,i have a 2000,1.9 tdi A3 ,i changed the oil and filter,drove the car for approx 5-6 miles parked it for an hour went to start it and it would not start,itried several times all it would do is turn over ,after a long spin over it eventualy started as it started the oil warning flashed up on the dash so i checked the oil level and found it was overfilled bu about 3/4 of a litre so i drained it to the correct level,and the car started ok like it should repeatedly but on driving the car the glow plug light is flashing all the time i have no idea why can anybody help,also is it because i overfilled with oil that the car would not start?thanks in advance...read a few more posts tried the brake light are working and they are ok,also just tried to start the car again would not start first time as it normaly does but started second time.

[Alan02]

You really need a fault code read. Have you checked that you havent disturbed any multiplugs on any sensors?

[kwak lad]

thanks for the reply alan,iv checked all the conections i can see etc,still the same,ware can i get a code read done does it have to be a audi dealer or will any garage be able to do it,also what is the cost likely to be ,thanks dave.

[Alan02]

Most Indipendent garages will have a Diagnostic reader for just about all models of cars. As it only takes a short time to read the codes, it shouldn`t be too expensive. A print-out would be helpful too, but they may not offer this to customers.
The Glow Plug lamp flashing will be caused by your non-start problem, but it may now just be recorded as a Stored Fault. If it is a Current fault....its still there !
It needs to be cleared, and road tested to see if light comes back on.

[kwak lad]

hi alan,i have had the code read done it said ENGINE SPEED SENSOR G28 IMPLAUSIBLE SIGNAL PO321,it was cleared and the flashing glow plug light dissapeared,ware is the engine speed sensor located and does this mean it needs replaceing if so have you any idea what they cost.thanks for the help so far dave.

[Hex69]

16705/P0321/000801 - Engine Speed Sensor (G28): Implausible Signal

Possible Symptoms

• Engine shuts off
• Engine doesn't start
• Speedometer inoperative
• Glow Plug Indicator Lamp (K29) flashes

Possible Causes

• Engine Speed Sensor (G28) loose
• Engine Speed Sensor (G28) faulty

Possible Solutions

• Check Engine Speed Sensor (G28)

Special Notes

• The Engine Speed Sensor (G28) is also used as a reference sensor for the crankshaft position and correlates with the Camshaft Position Sensor Bank 1 (G40) and Camshaft Position Sensor Bank 2 (G163).
• When found in a VW Golf/Jetta (1J/9M) or Audi A3 (8L) with 1.9l TDI-PD (AXR), check TPI 2007067 which explains issues with electro magnetic interference. A modification to the wiring will fix this problem, extensive details can be found in the named TPI. Even though this TPI was originally released for VW Golf/Jetta (1J/9M), a customer of ours came across the same issue on an Audi A3 (8L).
• When found in a 2004 VW Golf, Jetta, or New Beetle with 1.9l TDI-PD (BEW), check for TSB 2010461 (01-07-45 formerly 97-05-03) or 201463 (01-07-44 formerly 97-05-04) calling for a flash update to the ECU and a secondary ground installation.

If the light has gone out, and the fault's been cleared, I'd keep driving. It may be that the Fault Code appeared as Alan said, because you were cranking the engine for a long time.

[kwak lad]

thanks Hex 69,ill keep driving it then and see if anything develops,though hope not !cheers dave