watson72!

I need help I need a diagram for 2001 Mercedes-Benz CL K4 30 with AMG package the codes came out that I need a front and back O2 sensor we just replace EGR valve car is running better but check engine light is still on coded saying O2 sensors need to be replaced please help can't pass emissions in Arizona thank you!!

cindyclk

Post the error codes...if you do a search on both MB forums, you will see that most of the oxygen sensor codes are actually bad MAF sensors.
...easy diy...if you do replace MAF, get an oem one from autohauz not an ebay/china one (they fail quickly).

edit...just saw that you posted on a similar thread...that thread tells you the same thing

BTW...I have not seen any posts in 9 years that actually had bad o2 sensors when it threw o2 codes.

jonUF02

I doubt it's the sensors, probably the cat between those sensors is bad. Post the exact codes.