RESOLVED - AMG not as smooth - codes p203b-016 / p203b-064 / c1038 / c1022 - Mercedes Benz SLK Forum

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#1 Old 11-01-2017
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RESOLVED - AMG not as smooth - codes p203b-016 / p203b-064 / c1038 / c1022

In the last 24hours my 05 SLK doesnít seem quite as smooth as it once was. Its not bad and no one else notices but to me itís not quite as perfect as it was.

It feels more like the gear changes are a bit clunky so I have put a carsoft code reader on it. The transmission is fine although there were codes in some of the other modules. Iíve googled them but got myself confused as I have seen the same codes listed for ecu, o2 sensor, acc pedal and DPF (really odd as itís petrol not diesel)

For the slk, please has anyone had the following and know the solution. p203b-016 / p203b-064 / c1038 / c1022

All of the others seemed to have meanings with non relating to the engine or gearbox. I also cleared all the codes and so far only the first two came back. I also have a battery tester on order as while I have good battery voltage and the car does start, I have a few other niggles which could be battery and I do know a poor battery can cause so many issues.

Also, there are no warning lights on that shouldnít be etc, the gearbox oil was changed a few months ago with the fluid that came out looking in ok condition with the correct fluid going back in to the correct level. (Also I donít believe there to be any leaks as there are no drips when parked although I havenít being underneath to look).

Thanks in advance.

Last edited by Avel Du; 02-03-2018 at 06:47 AM.
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#2 Old 11-01-2017
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What mileage?

Trans oil change due circa 40Kmile (70Kkm).

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#3 Old 11-01-2017
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Techron or similar in your neck of the woods
cheap possible fix

https://www.slkworld.com/off-topic/10...-tier-gas.html

https://www.slkworld.com/general-disc...-learning.html


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#4 Old 11-01-2017
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Thanks for these links. We donít have that brand in the uk but do have some other makes so Iíll see what uk ones come up good. Mine has got 136k on it so a clean through the fuel and a gearbox reset at the weekend hopefully will help.
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#5 Old 11-01-2017
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what about your fuel filter?
has that ever been changed?
Usually done at 120000 miles


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#6 Old 11-01-2017
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Quote:
Originally Posted by Avel Du View Post
What mileage?

Trans oil change due circa 40Kmile (70Kkm).
136k currently with a transmission service 3k ago. The old oil was ok and no real chance when it went from the old to new.
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#7 Old 11-01-2017
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Quote:
Originally Posted by jbanks15 View Post
what about your fuel filter?
has that ever been changed?
Usually done at 120000 miles
Iím not sure. Iíll have a look through the service history. Where is the filter on these and is it accessible to change?
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#8 Old 11-01-2017
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Quote:
Originally Posted by Marct View Post
Iím not sure. Iíll have a look through the service history. Where is the filter on these and is it accessible to change?
In the trunk
see post 193 of my thread

https://www.slkworld.com/performance-...er-thread.html


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#9 Old 11-01-2017
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Wow-have I understood your pics correctly -itís in the tank. I doubt thatís ever being changed if so. Iíll look into this but think Iíll put the cleaner through first then have the filter done on the next service
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#10 Old 11-01-2017
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In the trunk...on top of the tank...fuel....get it? filter


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Quote:
Originally Posted by Marct View Post
136k currently with a transmission service 3k ago. The old oil was ok and no real chance when it went from the old to new.
How long after the trans oil change did the problem happen?

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#12 Old 11-01-2017
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Hi All


You can get this Techron stuff here in the UK , Amazon


https://www.amazon.co.uk/s/ref=nb_sb...ywords=Techron


I use two lots last year in mine .


Cheers


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#13 Old 11-01-2017
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Put Shell Vpower in for your next couple of fills too.

Good stuff.
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#14 Old 02-03-2018
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This is now resolved. It was an oil leak.

Love the car so Iíve had a full gearbox rebuild. Itís now a 0 mile old box and drives great so this is now resolved. Thanks for all the support
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#15 Old 02-03-2018
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Quote:
Originally Posted by Marct View Post
This is now resolved. It was an oil leak.

Love the car so Iíve had a full gearbox rebuild. Itís now a 0 mile old box and drives great so this is now resolved. Thanks for all the support

Glad that you are sorted

In case anyone else gets the same issue(s):

Where did you find the oil was leaking from?

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#16 Old 02-03-2018
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Hi, it was leaking from the radiator so no drips under the box etc.
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