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Old 03-20-2010, 01:36 AM   #1
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check engine light

I have owned my 2004 CLK 500 for less than a week and put less than 500 miles on it... But when driving today the yellow "check engine" light came on. The car has 45k miles and the next schedule A maintenance is due in 9600 miles.

There were ways to check the diaganostics on other cars I have owned and I am sure there is a way to get to the car's diaganostics to determine what the check engine light is saying. I do not have a shop manual so can someone direct me on how to access this information and where I might find a key to the codes that are displayed? I would hate to think that everytime something like this happens you need to head to a dealership... that would get pretty expensive pretty quick.

Thank you for any help in determining this....

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Old 03-20-2010, 08:08 AM   #2
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Check eBay for "Mercedes code reader" should be around $30
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Old 03-20-2010, 11:56 AM   #3
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Did you get gas during the week? Check the obvious first before jumping to any conclusions. Could be something simple like a gas cap etc... It may reset itself after a few start ups.
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Old 03-22-2010, 10:26 AM   #4
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Follow up

I went to the local Autozone and had them check the code... turned out to be a P0456... I checked the gas cap and had him clear the code. Now time will tell if it comes back or not. I did look into the code someone elsewhere on this site said that the slow leak may take time to come back up.

Time will tell... thanks for the responses.
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Old 03-22-2010, 04:11 PM   #5
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If the gas cap is tight and the light comes back on again, you may want to replace the gasket o-ring in the gas cap. It's a cheap part from the dealer.
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Old 03-23-2010, 10:27 PM   #6
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Went to the dealership today and they said this might be some kind of European setting.

I asked if they should reload the software but they said this might not help because they had to know which software to reload. ???
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Old 03-24-2010, 11:08 AM   #7
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yeah i had that code evap i think small cost me $700 at the dealer....they replaced the seal or gasket around the filler neck
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08, 2003, 2004, 320, 350, 500, cap, check, clk, engine, light, mercedes, mercedesbenz, p0456, reset

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