Purchasing an SLK w/ Check Engine Light - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 03-17-2018
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Purchasing an SLK w/ Check Engine Light

Hey! So I really want to buy this SLK down the street but the check engine light is on. Im going for a test drive and I'm gonna try and hook up my scanner to it. What error codes do I need to look out for so I dont buy into a ton of problems.
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#2 Old 03-17-2018
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what generation slk? r170? r171? r172?

then i can move your thread to the appropriate section

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#3 Old 03-18-2018
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You list an R170, maybe start with a read of the TSBs
SLK R170 Service Campaigns (TSB) - Mercedes Benz SLK Forum

If you are looking at other models there are TSB listings for each model type.

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Thanks go to those that post problems, solutions & feedback. It all helps.


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Smartop : Cubby Holder : Cree fronts : Both rear fogs : Clock Insert : Quicksilver exhaust



Useful R170 diy:

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#4 Old 03-18-2018
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The 320 engines are fairly reliable, CEL usually caused by faulty electrics, usual fault codes relate to,
Secondary air,
Camshaft sensor,
Crankshaft sensor,
Missfire, random or a specific cylinder and plug.
The K40 relay can also cause CEL to come on.
Try and get a list of the fault codes then look up on the OBD2 website.
There are a lot of faults that do not cause the CEL to come on so there may be quite a list stored in the ECU.
Regards Stuart.
LIL DON SLK, Idiot101 and pjb like this.
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#5 Old 03-18-2018
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Im picking it up tomorrow because the carfax was so good. Its actually a 230 slk. The owner took it in to the dealership to get serviced regularly. Im going to get the codes probably after I have the title but so what I'm down to get one of these back to mint condition. 3 owners and alot of replaced parts. Any codes that should keep me from buying it?
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#6 Old 03-18-2018
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When you get it
Update this please

Vehicle: 2000 SLK 320
To 230
320 was 6 cylinder
230 4 but kompressor


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