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Old January 17th, 2010, 17:57   #1
Join Date: Feb 2009
Location: sebastopol
TDI(s): 98 jetta tdi
Default 98 Jetta. Check engine with glow plugs both flashing

i just started the jetta up this morning and the glow plugs turned off, i started the car...and then they started blinking and the check engine light turned on also...
i turned it off, waited, tried again. same thing happened...
turned key, glow plugs went on an off, then started the car...
drove a bit, and both glow plugs and check engine went on.
im curious on the severity of this issue because i can't afford big repairs...
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Old January 17th, 2010, 18:30   #2
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Join Date: Jul 2007
Location: Round Rock, TX - VCDS
TDI(s): All gone

Check the brake lights function.
Otherwise, there could be a fuel injection fault, which would need to be checked with VCDS.
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Old January 17th, 2010, 18:45   #3
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Join Date: Feb 2008
Location: Guelph
Fuel Economy: 4.5l/100

IIRC those cars throw that fault as well when the fuel filter is need of replacing or water seperator needs draining.
2016 Jeep Wrangler, no longer do I have a diesel, repair manuals or spare parts sorry.
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Old January 18th, 2010, 08:42   #4
Join Date: Mar 2009
Location: Sweet Valley,PA
Fuel Economy: 43-48 hwy

I too have a 98 and recently the check engine light came on along with really high boost spikes....any ideas?
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Old February 2nd, 2010, 18:50   #5
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Join Date: Apr 2005
Location: Nashville, TN

I have flashing glow plug light on 98 Jetta when driving. I remember the A2 diesels this meant water separator needed draining. But i could not find where this is on the A3 or mention of the flashing glow plug light in the owners manual or the Bentley. But it is time to change my veggie fuel filter and maybe the stock one. What sensor is triggering this and why is this not mentioned in manual? Or did i miss it?
1998 Beetle tdi
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Old February 4th, 2010, 12:15   #6
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Join Date: Jun 2003
Location: Gaithersburg, MD, USA

There is a list of conditions that cause the glow plug light to flash in conjunction with the check engine light available somewhere posted by MoGolf. By far the most common is the brake lights or the brake switch,
but other critical sensors can also cause it. I saw it myself when the wiring to my start-of-injection needle sensor on injector 3 came loose. You may also experience a limp mode with this condition.

Your best bet is to pull the codes and see what is causing the condition to be flagged.

1999.5 (A4) Tornado Red Jetta GL TDI,5 speed,4 door, RC 2+, Old Navy CCV mod, ventectomy, CAT filter
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