p0685 Fault code

Liamkylewall

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Jul 20, 2020
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Your Mercedes
A200 cdi sport 1.8
Hi eveyone!
After some help, I have had p0685 code on my car also as soon as I put my key in a give it one turn I hear an electric noise which doesn’t go until I turn the engine off which it goes after 2/3 mins, also have the same noise when I accelerate at high speeds it increases, I’ve looked online and am drawn towards the starter motor relay.

cheers
Liam
 

Dean Fletcher

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Mar 24, 2018
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Location
Penrith, Cumbria
Your Mercedes
Mercedes E400
Hi eveyone!
After some help, I have had p0685 code on my car also as soon as I put my key in a give it one turn I hear an electric noise which doesn’t go until I turn the engine off which it goes after 2/3 mins, also have the same noise when I accelerate at high speeds it increases, I’ve looked online and am drawn towards the starter motor relay.

cheers
Liam
There a few things that's may cause this
Failed relay
Corroded wires
Fuse

Plus many more but these spring to mind

Best thing to do it get it on star, saves time and wonga at the end of the day.
 
OP
L

Liamkylewall

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Your Mercedes
A200 cdi sport 1.8
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Thank you for the advice! Without sounding dumb lol what do you mean by star? Thanks
 

Blobcat

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R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
"Star" is the Mercedes specific diagnostic machine
 

Dean Fletcher

Senior Member
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Mercedes E400
Star is mercedes specific diagnostic scanner. It does more than just read codes. All good mercedes indies have them. If they plugged your car in it would give them/you much more detailed information regarding the fault. At this point it's a guessing game star would point them you in the right direction for a fix.
 


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