Lag in downshift after changing auxiliary battery
Thread Starter
Newbie
Joined: Apr 2022
Posts: 5
Likes: 1
Mercedes E class
Lag in downshift after changing auxiliary battery
Hello
i have mercedes w212 350 2015
i bought the car with 79000 miles, the dealer changed the auxiliary battery and installed an incompatible one. The eco mode feature wasn’t always available (it shows sometimes and other times it doesn’t show on the dashboard screen, although the light is always green on the button). I suspected it is the auxiliary battery and changed it to a genuine mercedes benz battery, after which i noticed lag in gear downshifts. Is it normal and just needs adaptation or it might be something serious?
- no check engine light or anything else showing on the dashboard
- oil stick indicates good oil level, as per the records i can drive around 1500 more miles before service.
i have mercedes w212 350 2015
i bought the car with 79000 miles, the dealer changed the auxiliary battery and installed an incompatible one. The eco mode feature wasn’t always available (it shows sometimes and other times it doesn’t show on the dashboard screen, although the light is always green on the button). I suspected it is the auxiliary battery and changed it to a genuine mercedes benz battery, after which i noticed lag in gear downshifts. Is it normal and just needs adaptation or it might be something serious?
- no check engine light or anything else showing on the dashboard
- oil stick indicates good oil level, as per the records i can drive around 1500 more miles before service.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
Should not have accepted incompatible battery. Not sure battery caused this but if you had dealer install correct battery they would have to diagnose inclusive of pulling codes.
Last edited by konigstiger; Mar 26, 2023 at 11:00 AM.
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,228
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Hello
i have mercedes w212 350 2015
i bought the car with 79000 miles, the dealer changed the auxiliary battery and installed an incompatible one. The eco mode feature wasn’t always available (it shows sometimes and other times it doesn’t show on the dashboard screen, although the light is always green on the button). I suspected it is the auxiliary battery and changed it to a genuine mercedes benz battery, after which i noticed lag in gear downshifts. Is it normal and just needs adaptation or it might be something serious?
- no check engine light or anything else showing on the dashboard
- oil stick indicates good oil level, as per the records i can drive around 1500 more miles before service.
i have mercedes w212 350 2015
i bought the car with 79000 miles, the dealer changed the auxiliary battery and installed an incompatible one. The eco mode feature wasn’t always available (it shows sometimes and other times it doesn’t show on the dashboard screen, although the light is always green on the button). I suspected it is the auxiliary battery and changed it to a genuine mercedes benz battery, after which i noticed lag in gear downshifts. Is it normal and just needs adaptation or it might be something serious?
- no check engine light or anything else showing on the dashboard
- oil stick indicates good oil level, as per the records i can drive around 1500 more miles before service.
MBWorld Fanatic!
Joined: Apr 2006
Posts: 4,694
Likes: 1,829
From: Dallas-Ft.Worth,TX
2016 E350 Sport
For your facelift 2015 with Keyless Go, try this procedure...
With the Keyless Go button inserted:
1) foot off the brake during the whole procedure
2) press the Keyless Go Start button once
3) press the accelerator to the floor and hold for 5 seconds
4) press the Keyless Go Start button twice to turn off the ignition
5) release the gas pedal
6) Wait at least two minutes before starting the car.
With the Keyless Go button inserted:
1) foot off the brake during the whole procedure
2) press the Keyless Go Start button once
3) press the accelerator to the floor and hold for 5 seconds
4) press the Keyless Go Start button twice to turn off the ignition
5) release the gas pedal
6) Wait at least two minutes before starting the car.
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Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Missing ECO: sign of electricals...
It's a good idea you go after getting ECO ready again.
Using "ECO Stop" is not really engine friendly but not having "ECO:green" flag is a sign something's not right - So fixing this is a low priority but guaranteed improvement under $500 when DIY'ed.
> WHAT:
-- The top offender is main battery calling attention. It may be old, discharged or not charged well.
-- Get a scanner to read your car faults so you can improve your ownership affordably.
-- Your local dealer will fix that under $1,000.USD hopefully with a genuine OEM battery
Last edited by CaliBenzDriver; Mar 29, 2023 at 11:31 PM. Reason: dealer's luxury care
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