Check Engine Light On Due to Failed Mass Air Flow Sensor on Mercedes-Benz SLK230

Problem Description and Possible Solution

The mass air flow sensor can fail, resulting in poor fuel economy and Check Engine Light illumination.

Problem Data
RepairPal Verified
Average mileage: 90,933 (44,000–190,347)
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004
30 people reported this problem
Viewing 1 - 10 of 10 comments
I replaced the Mass Air Flow Sensor, not a hard fix, you can do it yourself, no need to pay the high dealer price.
Actually was on way to get vehicle smogged and check engine light came on...therefore could not smog. Took car to shop. They ran test and found downsteam 02 sensor out of limits. replaced to the tune of approx. $616.00, $260.00 was labor, rest part. Still not sure if will pass smog. I have to drive 150 miles to reset computer info before it can be smogged.

These sites may be helpful...or maybe not...
check engine light on, wouldnt pass smog test, misfiring, replaced mass air flow sensor, part alone was 450.00