CharlyE500

Hi guys,

I got check engine light last night while driving slow. I don't have the scan reader but I did some search so the possibility are: MAF sensor, gas cap and Oxygen sensor. Do you guys think better just replace it or clean it ? I will fill up the gas with a bottle of Techron to clean the system. I really hope is not the exhaust or need to replace MAF sensor. However, I felt the car is not as fast as the 04 CLK55 I had before. Thanks for any advise.

CharlyE500

I know it's stupid to ask but how do I even remove the airbox ? just pull hard ??

CharlyE500

I finally got the airbox out but still can't get the maf sensor out..... I will just go to my indy shop.

ChiCho55AMG

To remove MAF sensor. There is one electrical connection. Push the grey holding clip back with a flat head screw driver, once it snaps back it's easy to remove. (This the the same type of electrical connection you will find all over the vehicle) There are three clips holding the MAF sensor in place. Image 1 shows the two plastic clips (in black), and Image 2 shows the third clip (after MAF is removed). The metal clips in the back must be pushed out of the way first (Image2). Simply use your finger, or flat head to push the clip towards the rear of the engine compartment. The clip will stay out of the way, but does not come completely out. In red (Image 1) shows the direction you must push the two black plastic clips - first outward, the backward (towards the back of the engine compartment)

ChiCho55AMG

Whats the mileage on ur car ? Put ur car on a star scanner and read codes , from there u know what to do.... Or if u want just pull the negative from the battery for 15 min , check engine will go . Drive the car , and if it comes back again the check engine , then u have stored code ( what I feel it might be an oxygen sensor )
Good luck

CharlyE500

Thanks for your response. I feel the car is not as fast as my 04 CLK55 that's why I think it's the Maf sensor. It has 98K miles now. I will have someone remove the Maf sensor and clean it as regular maintenance item. And if the engine light comes back then will figure next time.

henry47

Please pull the code. It can be a number of things. get a code reader from amazon, it's like $20.

betrezra

Get codes. You are shooting in the dark without it. This is not an old school carb car. We can help you after you get some more info.

ChiCho55AMG

No problem , you are welcome . Try to get codes both ways , it will be better . Good luck

CharlyE500

Finally got the code, P0410 and P0432. Any ideas ? Thanks !

ChiCho55AMG

P0410 Secondary Air Injection System Malfunction
P0432 Main Catalyst Efficiency Below Threshold (Bank 2)




Potential causes of a P0432 code include:

• Bad or non-functional catalyst
• Engine operating out of optimal air:fuel ratio

A code P0410 may mean that one or more of the following has happened:

• Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
• Blown AIR pump fuse due to freezing up

CharlyE500

The check engine light was fixed but came back again... can anybody tell me the part number of Secondary air pump relay ? and where is locate ?

Thanks !

pjg

http://www.mbpartsworld.com/p/__/REL...025426519.html

CharlyE500

Thank you !

Rastus

Henry47
Do you happen to have a link to a reader for $20.00. I have a 04' CLK55. The check engine light came on.
Thanks
John

Justin9212

Go to an auto parts store and get the code read for free. I can help you the best I can with diagnosis from there. Without codes you are only creating more variables by changing anything.