Check engine light on due to Tank Cap Loose - Page 2 - Mercedes-Benz Forum

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post #11 of 22 (permalink) Old 07-26-2007, 11:49 AM
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Originally Posted by gahmed
Hello everyone,

Thanks for all the information. I went ahead and ordered the new cap (thanks greg for the link and part number!!). The main thing is that I have to take my car for an emissions test and that light needs to go off.

Johnhef, how much would you charge to change the crankshaft part? Are you available on AIM? I added you to my list.
Please report back and let us know how it turns out. It will be instructive for everyone. And good luck!!

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post #12 of 22 (permalink) Old 07-26-2007, 12:01 PM
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Send a message via AIM to johnhef
hefdmc12 on aim, I'll try to sign on tonight after 6pm or so.


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post #13 of 22 (permalink) Old 07-26-2007, 02:20 PM
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Quote:
Originally Posted by gahmed
Hello everyone,

Thanks for all the information. I went ahead and ordered the new cap (thanks greg for the link and part number!!). The main thing is that I have to take my car for an emissions test and that light needs to go off.

Johnhef, how much would you charge to change the crankshaft part? Are you available on AIM? I added you to my list.
Hey, gahmed.

Don't let all the tomfoolery in this thread dissuade you. My experience has been that when there is a single code, it's usually dead on, when there are multiples, that's when you need good interpretation because one sensor going out of range can trigger others.

Don't clear your codes after you put on the new cap. If you do that the system could take more than a week to come back into a "ready" state and if it is not in a "ready" state they won't do the emissions test. After you put on the cap, it will take about 8 start and stop cycles (normal driving, not just start it up and turn it off) and about 45 miles. Assuming no codes are being thrown during that period the light will go off by itself and then you can take it in.

You mentioned a crankshaft part, which one are you talking about? Did you get another code that traced to the CPS?

Take care and enjoy the ride,
Greg

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post #14 of 22 (permalink) Old 07-26-2007, 04:47 PM
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"...tomfoolery?" Please define and point to specific posts.

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post #15 of 22 (permalink) Old 07-26-2007, 05:17 PM
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My understanding is that those OBD II codes are notoriously unreliable and ofter incorrect. My experience is that w/out someone who really knows MBs you can waste a lot of time and money diagnosing and correcting those CELs.
Actually OBDII codes are really simple to read [you can even get a reader yourself for under $150]. They provide codes which are very easy lookups. Every INDY would have the correct tables, obviously the dealers do and from what I have seen on the AutoZone and Advanced Auto computer they have a very comprehensive system. It is the same one that ASA Certified Service Centers use.

I have found that Mann and Bosch parts that are the same parts that the Benz dealer sells -including the same part number- are available at AZ and AA for about 1/3 the price than the Dealer. The only difference is the Benz part has Mercedes printing on the Box, while filters and electric parts from Mann, Bosch and others carry the original supplier printing on their boxes. And the warranties are often longer.

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post #16 of 22 (permalink) Old 07-26-2007, 07:07 PM
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Originally Posted by mcbear
Actually OBDII codes are really simple to read [you can even get a reader yourself for under $150]. They provide codes which are very easy lookups. Every INDY would have the correct tables, obviously the dealers do and from what I have seen on the AutoZone and Advanced Auto computer they have a very comprehensive system. It is the same one that ASA Certified Service Centers use.

I have found that Mann and Bosch parts that are the same parts that the Benz dealer sells -including the same part number- are available at AZ and AA for about 1/3 the price than the Dealer. The only difference is the Benz part has Mercedes printing on the Box, while filters and electric parts from Mann, Bosch and others carry the original supplier printing on their boxes. And the warranties are often longer.
I know the codes are "simple to read." There are complete sets of "look-ups" all over the Internet. Having the corect tables dose one little good if the codes are wrong.

I'm not saying they are always wrong, just that you cannot always depend on what they tell you.

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post #17 of 22 (permalink) Old 07-26-2007, 08:31 PM
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If I remember correctly, the "gas cap code" is PO400 or P0442 (or something like that). It not only could be the gas cap. It could be a small leak in the fuel system. As suggested, get a new cap, reset the code at Advance Auto. If it comes back again, go to an good independent that has the machine that can find the leak. It is some kind of smoke machine. I had it done on my old w163.

Mike
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post #18 of 22 (permalink) Old 07-26-2007, 09:02 PM
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Pillay is right. The code is for EVAP system leak detected-small. Usually gas cap, but in my case, no. Mine was the plastic cap on the end of the fuel rail on left side (facing the front of engine-passenger side) was loose. It happened shortly after I visited the dealer for an EGR valve replacement. Hmmmm.

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post #19 of 22 (permalink) Old 07-26-2007, 09:28 PM
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Originally Posted by Jayhawk
I know the codes are "simple to read." There are complete sets of "look-ups" all over the Internet. Having the corect tables dose one little good if the codes are wrong.

I'm not saying they are always wrong, just that you cannot always depend on what they tell you.
Some of the codes are obvious BUT as posted above they are there to point you in the right direction, a diagnostic tool. I tend to recommend that folks go to one of the FREE diagnostics for many of the CELs that don't send the car into limp home mode because it gives them a list of codes that are thrown [all valid] and a chance to do some self diagnosis if they can DIY or to get on the board and bounce it around with others.

Then, if the cap/fuse/theromostat/battery/O2Sensor solution doesn't quickly address the problem then they can go to the next level with hard information, the first three hours of diag time done and a better knowledge of what should be going on.

Or they can put a piece of electrical tape over the CEL.

McBear,
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post #20 of 22 (permalink) Old 07-26-2007, 09:41 PM
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................
Or they can put a piece of electrical tape over the CEL.
I like that "solution..."

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