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Check engine light came on, using Vag-Com, code indicated #3 glow plug, replaced all glow plugs. Now after a normal start the check engine light illuminates after 30 seconds and Vag-Com shows #3 glow plug code. Could this be a harness or relay issue?
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This relay provides the power to
all of a TDI's engine-based electronics.
If the glow plug light comes on intermittently by itself, check
your brake lights too.
A burned-out bulb will cause the glow plug indicator
light to come on.
Sometimes flashing is caused by a bad Brake Lamp Switch on the Brake Pedal. It was updated for free by VW .
If you can see it under the knee panel, the Brake Lamp Switch body should be Metallic Green....if it is Purple or Black it need updated.
this is a common problem for these cars glow plugs go bad like spark plugs however the smoke would lead to bad mass airflow meter. it is not telling ecu corrcet miss. disconnect mass airflow meter. when cold see if this makes it start better. it should would means you need new m.a.f. glow plug issue take a test light place clamp on positive of battery then pull off glow plug connectors place tip of test light on glow plug the bad one will have a dull light unlike the good one which will be brighter. will need new plugs and wire harness four **** connectors and wire striper and crimper will fix concern good luck
You should get the OBD codes read. This should pinpoint the problem.
This light is connected to an emmissions problem. Re setting it will do
nothing as it will come back on as soon as the on-board computer
re=booths. As you dont have a loss of power,it sounds very like one of
the lamda units is faulty, but do the code reading to be sure.
Best of luck with it
John
Despite what you may read from other comments....The glow plug light is
simple a multi function warning light and IS among many othed
things in fact used to warn of brake light and brake light switch
failure. Therefore it can NOT be treated as glow plug problems only.
I have worked on V.W for many years and have encountered this problem
many times. You should get the OBD codes read. This will reveal the
exact problem...and there may be more than one
You can contact your V,W agents if you wish and check to see if I am correct.
Best of luck
John
Have you checked all of your vacuum hoses for leaks? Any vacuum leak, even intake manifold or throttle body gasket, will cause an engine stall right after starting. Likewise with a fuel pressure problem. If you aren't getting voltage, maybe whatever switch starts your glow plug cycle(either turning ignition on or opening driver door, depending on model) is defective, or any of the wiring of the circuit. It's a cheaper guess.
Remarkably, this problem is often associated with a faulty brake light switch down at the pedal! It happens on my '97 Sharan from time to time and a tap on the brake pedal with my left foot stopped the glow plug light flashing.
You may need to replace the switch; but I would suggest checking the connecting wires down there first - and get someone to tell you if your brake lights come on when you press the pedal.
Hope this helps you a bit. If it does, a "Fixya" rating would be much appreciated. If it doesn't help you, I'd be grateful if you didn't bother with a rating at present - they can't be increased later if I do manage to solve your problem! Just come back and tell me what you found. Cheers, D
replace the relay but check connections first as often connection get hot and corroded.failing which buy a push button switch use a relay and and some heavy wire to and from relay to the heaters and work them manually.you could try seperating the relay and cleaning the connections inside.
according to haynes beetle repair the code is turbocharger boost pressure control valve positive deviation. to trouble shoot
check the wiring, connecting pipes.using a hand held vacuum pump apply vacuum to the wastegate actuator,(with engine not running) check the actuator arm and lever for freedom of movement , disconnect the electrical connector from the boost pressure control valve. using an ohmmeter check the solenoid windings for an open circuit, the boost pressure control valve should measure about 25 to 35 ohms if excessive resistance or open circuit is indicated replace control valve.
a scan tool is required for a complete diagnosis of the system control circuits some may be rented from a local auto repair store hope this helps and norrows it down for ya
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