nobli

Hello everyone,

As usual, im back with a new set of problems on my 07 c230.

1) the check engine light came on and the vehicle doesnt cool properly. checked the codes and its the usual 028 temperature code. i looked on autozones website to find it cheap, but it doesnt seem to be the right one. Can someone verify that the w203 temp sensors on ebay are the right ones i need?

2) my gas gauge in my console doesnt work properly... this idk what is going on with. i have a half tank of gas and it shows full. but its going down like regular. it happened before and was gone by the next time i started the car up. What can this be from??

3) the lock on my gas cap doesnt work... not at all? what can be the cause of this ? is it related to number 2?

Thanks in advance.

Glyn M Ruck

- Buy a new electronic thermostat
- If the fuel gauge in the cluster is inaccurate it is likely that one of the two fuel level sensors has failed. - see 2 round covers under the back seat
- Do you mean the lock on the gas flap? If so make sure the tab is not bent & check out the solenoid operated pin has not failed or jammed. These issues are not related.

nobli

is this the correct one for my engine? http://www.autozone.com/autozone/par.../N-jq0klZ9pd73

2) i will check them, but what am i looking for exactly? and can you be a bit more specific about the location of these flaps?

3) the tab is okay, how would i go about checking the pin's status?

Glyn M Ruck

Please buy the OE thermostat. +- $100

Look at the numerous threads on changing the in tank sensors

Open the flap & lock & unlock the car. If the pin does not shoot in and out something is damaged. Investigate!

nobli

ok. ill take your advice on it and spring for an oem one.
and actually thats exactly what i meant by it doesnt lock. the pin doesnt shoot through anymore. any idea what the cause of this may be?

Also, Glynn, what is the difference between the oem and the one on ebay/autozone?

Glyn M Ruck

Either the solenoid that activates it had failed, Or the pin is bent & jamed, or a wire is off or fuse No 15 is blown in the rear SAM. LHS of trunk under that cover.

nobli

ill check the fuse and lets say for instance that the "wire" is off. whats the fix for such an issue like this?
And is there a huge difference between oem and the autozone/ebay thermostats?

Moviela

Yes there is a huge difference. The OEM is made to a specification, and subjected to a sampling destructive test to assure quality. The last thing a dealer needs is to pay a guy to replace a part that was bad out of the box.

Duralast makes parts that function after a fashion, but have zero quality control, no source inspection of raw materials, and are quite happy to let you change it several times or worse damage your engine. The "pellet" that controls the mechanical motion in response to temperature change is critical in terms of amount and quality of materials used. The manufacturing process is exacting and can't be done in a "factory" that consists of a room with workbenches. Duralast is like having chicken at McDonalds, it is an incredible simulation.

Glyn M Ruck

Plus the fact that the M272 has an electronic thermostat controlled by the ECU

Glyn M Ruck

You reconnect the wire.

nobli

well it seemed to be ok with the fuse. i changed it anyway though. still no solution. how can i get to the mechanism itself? or what would be the best way to figure out whats causing this gas lock issue?

wizkid

I had a similar problem with my '02. I ended up having to change the pump and fuel level sensor.

http://www.installuniversity.com/mb/w203/w203/fp.html

That is the step by step on how I changed mine.

nobli

hey wiz, reading other threads, it was recommended to change both at the same time. id like to avoid this if at all possible.

Glyn M Ruck

Nobli,

Remove the trunk lining on the RHS to get access to the filler flap locking mechanism.

Your car will have the new sensors & in-tank filter. No more spin off rings etc. See Johnand's car thread for full detail & removal with WIS docs.

If you don't want to replace both ( I don't blame you they are expensive) then you are going to have to remove them one at a time & get hold of a meter, work out which pin is what & measure each sensor as you operate the float arm. If you are uncomfortable doing this then take the car to an auto electrician. Preferably with the lower back seat out & covers off so that you only pay the labour for diagnosing & not stripping & reassembling the car.

See round covers.

nobli

I see Glynn, while it doesnt seem too daunting of a task, i might just do that. But idk. Something about all this is not sitting well with me. The gas lid not locking and this gas gauge thing is really weighing on my mind. The gas gauge works as a normal one should. What exactly could have caused this.

Glyn M Ruck

Level sensors wear out. Sometimes the flap lock stops working when people change batteries but that tends to be on older models with sensitive SAMs.

Johnand is critical of these new VDO parts.

nobli

https://www.getmercedesparts.com/mer...***-parts.html
would this be the correct part i need?
Collision Catalog - 2007 - Mercedes-Benz - C230
cooling system, cooling, water pump, thermostat 2.5L

$110.25

Glyn M Ruck

This is the correct thermostat.

nobli

i see. and would you say this is the one i should get? or should i just order one without the housing for cheaper ($30) i.e. http://www.rmeuropean.com/Part-Numbe..._91DEFFEE.aspx

nobli

http://bit.ly/x3IHoD

Would this be the piece i need?

johnand

Neither one of those is the correct one for your car. All M272 equipped cars have the heated electronically controlled thermostats. Be wary of any that are sub $100, they are likely wrong. Here is the correct one: http://www.rmeuropean.com/Part-Numbe..._91DEFFEE.aspx

Glyn gave good advice about your incorrect fuel level. Either replace both sending units, or pull out each one and test. Absolutely I am critical of Siemens/VDO parts of late. The 722.9 conductor plates and new style sending units and fuel pumps are all made by them, and there is a rash of premature failures. Sad to see a company traditionally known for building quality parts having such issues.

Project

im having the same pin lock problem let me know if u find a fix

C230 Sport Coup

Expose gas tank. Open tank cover, drop match in. Collect insurance money, if you survive.

nobli

project, will do. although i dont even know where to start with that issue to be honest.
and lol @ c230 sport coupe. i might need to do that

Glyn M Ruck

Nobli - the instructions on Install University make pulling the sensors a piece of cake. The only difference with the new sensors is that they use a giant hose clamp instead of the pickle jar rings to secure the sensor. If you feel uncomfortable tackling this then run your tank down to below half, take out the back seat lower squab & take the car to an Indy.