My car has been acting wierd lately. I would drive it one day and then a check engine light would come on, causing a major loss of power as if the supercharger is not engaging. I've check my belts and i've notice that one of my pulleys is not engaging at times. I've taken my car to a buddy of mine and used his obdii reader when the check engine light came on, and these 3 codes come up, 1) P1525: adjustable camshaft selenoid, 2)P1235: supercharger function, 3)P1420: Airpump switchover valve. I think one of my sensors is out but not sure exactly which one. I dont want to take it to thedealer if its something simple I can do myself. HELP ANYONE? THANKS

2000 SLK230

 

check the air pump relay.

 

On these motors I have found that the 1st thing to do is to clean the maf with crc maf cleaner or brake clean and reset codes.
That 95% eliminates maf even if only temporarily.
A contaminated maf causes many spurious codes to be set.
Also as Sleepwalker said there are issues from the air changeover valve. This is behind top front cover. The general fault here is the vac hoses running to it from the manifold get leaks, replace them, easy with generic vac hose (rubber)
Next is the bypass valve just behind supercharger, (egr)
Also make sure aircleaner is clean. Thats a start.

Bazzle

 

i am a newbie... so anyways where is the maf location? i've searched for pictures of it online but when i compare it to where it is in my car i cant find it, where is the location? thanks

 

also make sure your not getting oil into the airmass sensor. the oil seperator on the top of the valve cover can fail and then you get oil in the intercooler and then also oil in the airmass sensor....just another problem with your particular car.

 

Do a search over here:
http://www.benzworld.org/forums/r170-slk-class/
Many pix

Bazzle