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2003 Mercedes C320
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Hey All,

I've had my 03 C320 for about a year now...

it has just under 60K kms on it...

Recently I noticed a rattle but didn't think much of it... I was outside the car today when it was started and noticed how relatively noticable it was outside the car... My friend said it sounds like the skid plate is loose or the exhaust is loose... I plan on looking into this when I get my oil change...

Anyways, today, the car engine light came on for the first time... keep in mind that earlier in the day, I notice that there was some hesitation on acceleration... shortly after I started the car I drove off when I reach an intersection, I noticed a jerkiness about the engine like it was puttering... then the check engine light comes on flashing... I pulled off in a parking lot and stopped the car... when it came to a full stop the check engine light stayed on (without flashing)... the check engine light has been on all day... and since driving it again, it drives normal but with the light on...

Any suggestions as to what it is??

I plan on going to get an oil change tomorrow as well as look into what is causing the rattling... I plan on going outside of the dealer as I've been told that they charge an arm and a leg, I decided against the extended warranty...

Anyone know of any good OBDII tools that I can buy in Ottawa to extract my own codes??

Wyler
 

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1988 300 TE. 2001 ML 55AMG The Shop is Open!!!
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328 Posts
1stTimeBenzOwner said:
H

Anyways, today, the car engine light came on for the first time... keep in mind that earlier in the day, I notice that there was some hesitation on acceleration... shortly after I started the car I drove off when I reach an intersection, I noticed a jerkiness about the engine like it was puttering... then the check engine light comes on flashing... I pulled off in a parking lot and stopped the car... when it came to a full stop the check engine light stayed on (without flashing)... the check engine light has been on all day... and since driving it again, it drives normal but with the light on...

Any suggestions as to what it is??
Exhaust rattling, stalling, check engine light flashing, engine puttering.....

Sounds like a failed catalytic converter to me....

Pull the codes, you may get: PO300,301,302,303.....Misfire codes TWC Damaging

Happy Benzing!!!
 

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I had same problem before with my 2001 c320. It is the crankshaft position sensor. It doesn't cost much once you find the problem. Non-specialists will replace all kinds of things like the 4 oxygen sensors at $200 a piece while looking for it.
 

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'01-E320 & 02-ST2
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I had same problem before with my 2001 c320. It is the crankshaft position sensor. It doesn't cost much once you find the problem. Non-specialists will replace all kinds of things like the 4 oxygen sensors at $200 a piece while looking for it.
If you read his post carefully I'd respectfully disagree. He hasn't had any of the classic symptoms of CPS failure, and no matter how bad a CPS is it will never cause rattling.

You're absolutely correct that bad technicians will sometimes throw parts at a car rather than properly diagnosing the issue, but the best place to start is with obvious issues, and a rattle as the OP describes is quite likely to be the cat and if so, it absolutely has to be fixed. Square that away, get the codes read and move on to the next thing.

Wyler, check to see if you have an OBD-II port, I'm guessing you do. (It will be located behind a little door kind on the lower dash/kick panel kind of straight ahead of your knee, open the door and be sure there is a port actually there.) If you have the OBD-II port you can buy any of the OBD-II readers, I think Harbor Freight will ship up there as well (their 94169 model is quite good and affordable). But any of them will work fine.

If you don't have the OBD-II port, you're stuck with a multiplexer that will interface with the 38-pin diagnostic port and then use Carsoft with a laptop that has a dedicated Serial (COM) port.

Take care and enjoy the ride,
Greg
 
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