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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old April 14th, 2019, 16:22   #1
davran
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Default P0671 glow plug check engine light

I had the check engine light come on, and checked it with my scantool.net obdlink MX tool and Torque pro on my phone. It showed P0671 code, #1 cylinder glow plug.

Funnily, I wiggled the wire where it connects to the plug, and so far it's stayed off.

But, when the glow plug code was thrown, the dash also showed: "Emissions Workshop", which went away when I cleared the P0671 code.
Does a glow plug code trigger the Emissions Workshop warning?

Thanks, Dave.
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Old April 14th, 2019, 16:52   #2
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If the Vag says #1, its actually #4, get an ohmmeter, read the resistance of each glow plug, #4 will most likely be different than the other 3
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Old April 14th, 2019, 17:21   #3
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A glow plug issue increases the emissions the engine makes, so will trigger a "Emissions issue, time to get me to the Workshop" message.

And yup, in case you weren't aware, the glow plugs are numbered in the opposite order to the cylinders ... for reasons known only to the German engineers what built 'er. : )
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Note: The above is to the best of my knowledge- but at the end of the day simply interweb opinion, worth EXACTLY what you paid for it, and if used done so at your own risk.

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Old April 14th, 2019, 17:24   #4
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Originally Posted by afarfalla View Post
If the Vag says #1, its actually #4, get an ohmmeter, read the resistance of each glow plug, #4 will most likely be different than the other 3
That is not my experience. If some hack has removed and replaced the harness, the glow plug wires/numbers may have been interchanged. Leads 1-4 and 2-3 are the same length and can be interchanged. From the factory they read 1-4 front to back.

A glow plug fault will trigger an "emissions workshop" message and will turn on the check engine light. A faulty glow plug can be intermittent, only failing occasionally when heated, or it could be a poor connection, Be sure to remove the plug and check the part number before ordering a new glow plug, there have been 3 revisions.
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Old April 14th, 2019, 18:15   #5
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Thank you all for the info.
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Old April 15th, 2019, 13:26   #6
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Quote:
Originally Posted by QuickTD View Post
That is not my experience. If some hack has removed and replaced the harness, the glow plug wires/numbers may have been interchanged. Leads 1-4 and 2-3 are the same length and can be interchanged. From the factory they read 1-4 front to back.

A glow plug fault will trigger an "emissions workshop" message and will turn on the check engine light. A faulty glow plug can be intermittent, only failing occasionally when heated, or it could be a poor connection, Be sure to remove the plug and check the part number before ordering a new glow plug, there have been 3 revisions.
your wrong, there is no way you can interchange 1&4 and its tough to interchange 2&3
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Old April 15th, 2019, 15:22   #7
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your wrong, there is no way you can interchange 1&4 and its tough to interchange 2&3

It happens. When the harness is removed, people always assume the longest lead goes on the front, that's wrong. The second longest goes there and the longest on the rear. They interchange easily. The two center ones are less likely to be interchanged.
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Old April 15th, 2019, 20:01   #8
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Originally Posted by QuickTD View Post
It happens. When the harness is removed, people always assume the longest lead goes on the front, that's wrong. The second longest goes there and the longest on the rear. They interchange easily. The two center ones are less likely to be interchanged.

are you sure your driving an 05 passat tdi wagen? You would have to remove the harness and cut the outer insulation to expose each individual cable, for what reason would anyone do this? My wagen harness travels out of the boughs of the engine, along the bottom of the head and each glo plug wire spirals from the harness to its respective glo plug. There is no way 1&4 would interchange. You can try to justify your argument but your wrong.

Last edited by afarfalla; April 16th, 2019 at 06:27.
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Old April 16th, 2019, 03:45   #9
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Quote:
Originally Posted by davran View Post
I had the check engine light come on, and checked it with my scantool.net obdlink MX tool and Torque pro on my phone. It showed P0671 code, #1 cylinder glow plug.
Funnily, I wiggled the wire where it connects to the plug, and so far it's stayed off.
But, when the glow plug code was thrown, the dash also showed: "Emissions Workshop", which went away when I cleared the P0671 code.
Does a glow plug code trigger the Emissions Workshop warning?
Thanks, Dave.

There are a bunch of text warnings the MFA cluster is able to display depending on what faults are being flagged. So yes, any engine/trans fault will trigger the "emissions workshop" warning. There are others, related to brakes, oil pressure, coolant temp, etc. It is just an extra convenience, nothing more, no need to overthink that part.
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