CEL PO442 and Occassional Flashing Gas Light - Mercedes Benz SLK Forum

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#1 Old 10-27-2013
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CEL PO442 and Occassional Flashing Gas Light

Hello All,

Hope you all are enjoying fall!

A few weeks ago I was filling up at a Shell gas station and the autoshut off failed on the pumped and over filled the car and spilled about 2 gallons of gas onto the gas station pavement before I caught it. As soon as I started the SLK it start acting like it was choking on gas and eventually died and CEL illuminated. I got it started again and revved the engine for awhile to burn up some of the gas and drove it home just fine. I ordered and OBDII scanner online and have pulled and cleared this code twice now. It will go away for about 2-3 start ups and then come back on. I have also seen the car when idling kind of have a slight sputter and drop a few RPMS and then the RPM's stabilize. (It does not die) When this has happened the gas light has then flashed for the remainder of the drive until power cycle.

The gas station was no help and basically said they aren't responsible for any pump failures but I am wondering if there are some seals I should check to see if something popped lose from the pressure? Or if my gas cap could have "blown" out? Any ideas? Pretty novice here but just want to make sure it isn't terribly serious.
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#2 Old 10-27-2013
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Start by getting a new gas cap. The seal on the current one is bad. If not sealed the low gas light will come on.


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#3 Old 10-27-2013
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P0442 MB

Evaporative Emission Control System Leak Detected (small leak)

Not sure why over filling the car would through this code but that's what my MB OBD reader says it is.

Hope this helps some what.
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#4 Old 10-27-2013
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I agree, get a new gas cap! It's been long enough the seal is probably bad anyway and when you overfilled it you probably blew out the little rubber there was left.
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#5 Old 10-27-2013
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Thanks All- I will get a new gas cap online. Any idea's what they cost from MB direct? Also could this emissions code be in relation to the gas cap?
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#6 Old 10-27-2013
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I did this once with my SLK 230,took a couple of days to get normal!
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#7 Old 10-28-2013
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Try removing (use caution) the neg. battery cable from the battery and reconnect after 40 minutes.
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#8 Old 10-28-2013
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Originally Posted by mgconcierge View Post
Thanks All- I will get a new gas cap online. Any idea's what they cost from MB direct? Also could this emissions code be in relation to the gas cap?

Yes a leaking gas cap will create emissions code and cause the low fuel to light on the dash at the same time. This is explained in your owner manual that low fuel will light if gas cap is not tight.


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#9 Old 10-28-2013
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Raybonj just ordered a new gas cap recently as well they aren't too expensive.


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#10 Old 10-28-2013
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Yes it could. It will set a EVAP code if its not sealing. Your fuel system is not supposed to be open to the out side air. Its a closed system. After you start you car the power control module goes thru a self check test on the fuel tank evaporative system to see if there are any leaks in the system.If there is the check engine will come on. The system always has a slight vacuum on it and if you loose that vacuum it will make the light come on. If you run the car for a while then stop and remove the gas cap you should hear if it was in vacuum or not.

See diagram below
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#11 Old 10-29-2013
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Thanks all! I will get the new gas cap. My cap comes right off. Almost feels too easy no vacuum at all.
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#12 Old 10-30-2013
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My gas cap was the same, extremely loose, no seal at all. Just my personal experience and advice - don't get the cheap STANT brand cap. It didn't create a good enough seal, and I still had my same problems. Bought the BLAU gas cap next, and it worked like a charm. Took about 10-20 cycles, and about 100 miles before the CEL cleared. But now it has a great seal, and you'll easily notice the difference. I bought mine off AutoPartsWarehouse for reference. Definitely cheaper than buying from Mercedes.
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