Today I turned the key and waited for the glow plug light to go off, usually it's almost instant but today it just stayed on...
After 10 sec I turned the key and engine fired up as usual but the glow emblem did not go away, then check engine light appeared..
I drove the car no problem, parked and then restarted it again, the glow light operated like usual but the check engine light never went away.
Should I be concerned? I have 98k miles on my E320 2005 CDI.

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1987 300D
2005 E320 CDI

If there's a way to reset the check engine light (disconnect battery for a while?) I'd do that. Maybe it "thought" there was an error with the glow plug system and flagged it. Or maybe you have a bad glow plug.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Should be OBD II compliant. Any OBD II reader should give you a clue if not the precise code.

Sixto
87 300D

Glowplugs probably have failed

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL

i second the glow plugs, i have done 3 so far this week

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97 e320 200k!

85 300sd

96 c280 sport for parts! pm your needs

sounds about right to have glow plugs failing at that mileage

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1981 300SD 512k OM603

Is it a big PITA to replace the glow plugs on a CDI?
Do all of them fail at once or is it maybe 1 or 2 that give off a bad reading?

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1987 300D
2005 E320 CDI

Give it a day and a half and see if the CEL resets itself on its own after 3 cold/hot run cycles.

If not, get the code(s) read and deal with it.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Stop in at your local parts house and ask them if they will check your codes...Most O'reilly's and A-Zone have the OBD II readers and many will do it for you if they are not too busy...OR you can get a reader using their rent/borrow plan and DIY.
Either way, If the glow plugs have not been replaced, I'd do them all while you are in there as preventive maintenance.

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Bama1


2008 SLK 280, Firemist Red - "Hurricane"
2001 F150 Lariat 4x4, Black on Black - "Badboy"
1982 240D 4 speed survivor -"Pearl" - Donated to Vietnam Veterans
1962 Oldsmobile Dynamic 88 -"Gertrude"

1954 model original owner - ~2.5M
Gray softtop/solid exterior/modified chassis

its a bad glow plug. Checking the faults will tell you which one it is or you can check the resistance of each of them and the faulty one will be much higher then the rest of them. You can replace them one at a time if you wish as long as you have a way to reset the check engine light. Disconnecting the battery won't reset it.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Read the codes go from their. As said above its probably a bad GP or two. Personaly since they have been in their awhile I would replace all 6 and ream them. That way you shouldn't have to drill one out in the future.


I don't think disconnecting the battery will do much on the new cars, you actualy have to read, fix and reset the code.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

As far as replacing is concerned, I think it's about as easy as the 606 but it's subject to the same risks of breakage so you have to be really careful not to over torque them on removal.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

What do CDI plugs look like anyway? The engine itself looks like a 606 so are CDI owners in the same boat?

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200