I purchased a Mercedes Benz used car back in Sept 2011 (C200K W203)
I have driven 600 miles since the purchase and the Check Engine Light has come on 3 times.
On each occasion, I quickly connected the OBD2 reader to my car and it gave me a single DTC code - P0101 "Mass or Volume Air Flow A Circuit Range / Performance"
The OBD2 reader also allowed me to collect and record "live data" (total of 60 frames) whilst the engine was running and the following are the results of 1 out of 60 frames
DTC_CNT = 1
FUELSYS1 = CL_FAULT
FUELSYS2 = N/A
LOAD_PCT (%) = between 18.0 and 23.1
ETC = between 72 and 84
SHRTFT1 (%) = between -5.5 and -1.6
LONGFT1 = 0.0
RPM (/min) = between 740 and 761
VSS (km/h) = 0
SPARKADV = between 14 and 15
IAT = between 27 and 29
MAF (g/s) = 3.42 and 3.74
TP (%) = 4.3
AIR_STAT = no results
O2B1S1 (V) = between 0.110 and 0.570
SHRTFTB1S1 (%) = between -0.8 and 0.8
O2B1S2 (V) = 0.455
OBD = EOBD
The Check Engine Light seems to come on everytime I drive long distances at high speeds.
For example, if I drive 30mph to my parents house which is about 2 miles away from my house, there is no problem.
However, if I drive at 70mph to London Heathrow Airport from my house which is 23 miles apart on the highway/motorway, the light comes on.
With this pattern of my driving, does this give you an idea what is the root cause of the problem?
Please note that I had previously had the O2 sensor replaced as it was believed to be the source of the problem. However, this has not been the case since the Check Engine Light has come on at two occasions since replacing the O2 sensor.
Any feedback would be much appreciated
Thanks and regards
Wednesday, February 22nd, 2012 AT 11:44 PM