Engine management and glow plug lights

[darren0269]

Morning all
Only back into an S class a week and a problem

08 plate S 320 CDI

Car starts fine and drives perfectly but.... shortly after starting its glow plug light comes on for about a minute goes out and doesn’t return til the next start up - it’s now put on the engine management light (on continuously) when read error code P2084 appears twice with two pending

it’s awaiting service (overdue 12 days) and is off to a local Merc Indy when things get back to normal est.11/05

Would a run of the car at speed help it or worse damage it? In its options list it has a DPF but doesn’t seem to have an indicator lamp instructing a cleaning cycle - how do you know when it’s required?

thanks
D

 

[mioba]

Get the car plugged in to STAR/diagnoatics at a reputable indy.

your problem could be one of a hundred things.

DPF regens are automatic. usually no intervetion needed from owners

 

[darren0269]

Get the car plugged in to STAR/diagnoatics at a reputable indy.

your problem could be one of a hundred things.

DPF regens are automatic. usually no intervetion needed from owners

Thanks for your reply,
My ODB scanner lists the fault as code P2084 - twice and two pending - as I said car runs perfectly- but I’m curious what the garage is likely to report
D

 

[mioba]

Thanks for your reply,
My ODB scanner lists the fault as code P2084 - twice and two pending - as I said car runs perfectly- but I’m curious what the garage is likely to report
D

Where are you located and have you a good merc indy who knows his way around mercs and merc diags

 

[LostKiwi]

Take a look here:
https://forums.mercedesclub.org.uk/index.php?threads/error-code-help-please.155244/

I'd be loathe to drive it too much as often if the engine management light is on they won't regen the DPF.

 

[KennyN]

Glow plug light coming back on after the car is started usually is a faulty glow plug or two , well it was on my CLS.

EML could be many things so until the fault codes are read then anything else is speculation, it could be a sensor , well it was on my CLS.

K

 

[darren0269]

Where are you located and have you a good merc indy who knows his way around mercs and merc diags

Thanks for your replies

it’s off to Benza Autos (Wirral) hopefully on the 11/05 if things improve and a refurb of its AMG alloys at some point - any recommendations?
D

 

[EmilysDad]

... and a refurb of its AMG alloys at some point - any recommendations?
D

A lad at work recommended this place https://www.spectrumcoatingslimited.com/ after having a wheel refurb'd. I was about to take one of mine until this COVID thing happened.

 

[Oldspanners]

Generic description;

OBD II Fault Code P2084 :
Description of Fault code P2084
EXHAUST GAS TEMPERATURE (EGT) SENSOR 1/2 INCORRECT CORRELATION

Possible failure P2084

• Exhaust Gas Temperature (EGT) Sensor 1 (output large side, small side)
• Exhaust Gas Temperature (EGT) Sensor 2 (output large side, small side)

Diagnostic Procedure using AutoHex II Scan Tool

• The deviation between the estimate value and the actual value of the Exhaust Gas Temperature (EGT) 2 is more than a specified value for a set period of time.

Test Conditions using AutoHex tester

• Continuously

Clear Fault codes Conditions

• The deviation between the estimate value and the actual value of the Exhaust Gas Temperature (EGT) 2 is more than a specified value for a set period of time.

MIL Status

• Glow ON