1999 mercedes SL500,check engine light on - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 02-13-2007, 04:41 PM Thread Starter
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1999 mercedes SL500,check engine light on

Thanks in advance for any help or suggestions.check engine light on.had codes pulled showed P0170 fuel trim malfunction bank 1 and P0173 fuel trim malfunction bank 2.the person that pulled the codes for me had no clue what it meant.car is running great as always.it is not in limp mode.gas cap is on properly and tight.any help would be great and thanks again.see ya' Bill
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post #2 of 11 (permalink) Old 02-13-2007, 05:17 PM
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Hi, Felder, and welcome to the forum.

First, whenever you have something specific to your model it's always best to post in your native forum instead of one of the general ones. Scroll down and you'll see them all, then just pick the correct one. And if you have something really specific -- like an error code -- you can use the search function and usually find posts relating directly to it.

In this case your specific forum could confirm/deny the following, but the fuel trim codes in late-model MBZ's are most often the mass airflow sensor (MAF). If you're handy and a DIY type, it's a simple enough item to replace and if you wish to pull it and disassemble it, you can also clean it, which sometimes works.

Take care and enjoy the ride,
Greg

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post #3 of 11 (permalink) Old 02-13-2007, 06:26 PM Thread Starter
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Greg,thanks for the response.yes after i posted it here i saw where i should have posted it.thanks for the help and i will try and clean the maf tommorow after i get off.i'll let you know the outcome.thanks again.see ya' Bill
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post #4 of 11 (permalink) Old 02-13-2007, 06:41 PM
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Did you conduct a search for your error codes? Lots of good info to be found. Welcome to BenzWorld, BTW!

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post #5 of 11 (permalink) Old 02-13-2007, 08:01 PM
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Remove Mass Airflow Sensor. Remove the sensor itself. There should be 2 torx security screws holding it in. Spray the wire thoughly with CRC mass airflow sensor cleaner. Let it dry, reassembly and put back in your car. Disconnect battery cable to for 30 seconds or so to clear the error code. Reconnect battery and drive the car for a bit. If the error code comes back up, you need a new MAF. I am sure Germanstar has the insert for your model. It will be much cheaper than buying the entire unit.

Mike
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post #6 of 11 (permalink) Old 02-13-2007, 08:03 PM Thread Starter
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rON,THANKS FOR THE REPLY.HOW DO I SERCH THE CODES?THANKS IN ADVANCE.Bill
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post #7 of 11 (permalink) Old 02-13-2007, 08:07 PM Thread Starter
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Mike,thanks,i will try that and let you know the outcome.thanks again for the help.Bill
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post #8 of 11 (permalink) Old 02-14-2007, 08:51 AM
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Originally Posted by felderlostnspace
rON,THANKS FOR THE REPLY.HOW DO I SERCH THE CODES?THANKS IN ADVANCE.Bill
You can either search the forums (that nefarious little search button on the site) or you can google for the codes you have.

However, there's probably no need to really search for the codes, these -- as already noted -- are classic for the MAF.

Re: the sensor screws, FWIW these security torx screws will require a stunningly-expensive tool you'll never use again to remove. Since they are just a coarse (almost a wood screw) thread into plastic, I used vise-grips on the shoulder of the screw to start mine out, then offset a small flat-blade screwdriver in the head to finish the extraction.

Take care and enjoy the ride,
Greg

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post #9 of 11 (permalink) Old 02-14-2007, 08:57 AM
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We also have the appropriate torx bit. I think it goes for about $8, but most folks just get a little creative, as you suggested.

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post #10 of 11 (permalink) Old 02-15-2007, 05:34 AM
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I bought the torx security bits at a local parts store. If they are the screws with 5 prongs instead of 6, Harbor Freight has a set of about 100 bits for $10 or so. One of those bits will work. It is the kind with 2 prongs. As for the codes, just go down to Advance Auto or Autozone and they will read it for you for free. A list of what the codes mean is available on the "for new members links" or "Useful Links" sticky at the top of the R170 forum. Or post the codes here and someone will help you out.

Mike

Last edited by Michael Pillay; 02-21-2007 at 05:24 AM.
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