The car is 97 C230. No engine modification whatsoever.
112k miles on the Odometer

I pulled the codes with a scanner from harborfreight tools.
FAULT03
PEND 00
P0301
P0304
P0300


Thanks

 

P0300/P0301/02/03/04/05/06 are all plug/wire or coil. Since you have 112k my 1st indication would be wires/plugs. Wires are expensive at the Stealership. Try eBay..................

 

What problems are you having? I would first clear all of the codes and then drive it a while to see which ones come back. Who knows how long those have been in there.

Did you get a sheet with a set of Mercedes specific codes? A Pxxx code for Ford/GM may mean something else when it is pulled from a Mercedes. For the P3xx codes you pulled, I think they will be the same but I know they are different for other Pxxx. There are code lists up on the internet, so search if you need them.

 

or reputable places online like autohaus, buymbparts, fastlane

 

P0300 to P03XX - (XX is replaced with the cylinder number)
-- TWC protection single cyliner misfire (Single cylinder combustion misfire within 200 engine revolutions)
Note for testing of ignition misfire:
--The engine control module checks the function of the ignition groups and ignition output stages at engine operating temperature in all load an dengine speed ranges, via the primary voltage pattern. After 4 consecutive faults, the fuel to the affected cylinder is shut off and a message is sent to the diagnostic module via CAN. In addition to this protective measure, to assist in diagnosis, the engine control module counts the number of ignition misfires within 200 engine revolutions.
Note:
--The XX characters shown in the following listings will be replaced with a number, identifying the specific cylinder having the problem.
This number, as well as the affected cylinder is reported to the dianostic module via CAN. This count is continuous, even if the fuel is alrady shut off.

Note for testing combustion malfunction:
--The diagnostic module evaluates the engine speed signal (TNA) for uniformity at each engine revolution. Combustion misfires are recognized by unusal engine torque fluctuations.
P03XX
Random misfire detected (catalytic converter damage protection - ignition misfire/combustion malfucntion on several cylinders within 200 engine revolutions)
Activatoin requirement CHECK ENGINE lamp:
-- Two consecutive trips with fault
Activation of CHECK ENGINE lamp:
--None.
Test to detect fault:
--If several cylinders are involved during the test "Cylinder 1 to 6 misfire/combustion malfunction detected, catalytic converter damage prevention", the fault is recognized and the cylinder numbers and freeze frame data are stored.
P03XX
Random misfire detected (FTP standards - ignition misfire on several cylinders within 1000 engine revolutions)
Activation requirement CHECK ENGINE lamp:
--Two consecutive trips with fault.
Activation of CHECK ENGINE lamp:
--None.
Test to detect fault
--If several cylinders are involved during the test "Cylinders 1 to 12 misfire detected, FTP standards", the fault is recognized and the cylinder numbers and the freezeframe data are stored.
P03XX
Random misfire detected (I/M test - ignitions misfire on sevearl cylinders within 1000 engine revolutions)
Activation requirement CHECK ENGINE lamp:
--Two consecutive trips with fault.
Activation of CHECK ENGINE lamp:
--None.
Test to detect fault:
--If serveral cylinders are involved during the test "Cylinders 1 to 12 misfire detected, I/M program", the fault is recognized and the cylinder numbers and freeze frame data are stored.
P03XX
Cylinders 1 to 6 misfire detected (catalytic converter damage - ignition misfire on one cylinder within 200 engine revolutions)
Activation requirement CHECK ENGINE lamp:
--Immediately at fault recognition.
Activation of CHECK ENGINE lamp:
--None.
Test to detect fault:
--To prevent overheating of the catalytic converter, the diagnostic module checks if the permissible number of ignition misfires has been exceeded. If a fault occurs, the cylinder number and freeze frame data is stored.
P03XX
Cylinders 1 to 6 misfire detected (FTP standards - ignition misfire on one cylinder within 1000 engine revolutions)
Activation requirement CHECK ENGINE lamp:
--Two consecutive trips with fault
Activation of CHECK ENGINE lamp:
--None.
Test to detect fault:
--The diagnostic module sums the number of misfires of 5 successive monitoring periods (within 200 engine revolutions each). If the maximum permissible number for maintaining the emission threshold is exceeded by a factor of 1.5, a fault is recognized. The cylinder number and freeze frame data is stored.
P03XX
Cylinders 1 to 6 misfire detected (I/M test - ignition misfire on one cylinder within 1000 engine revolutions)
Activation requirement CHECK ENGINE lamp:
--Two consecutive trips with fault.
Activation of CHECK ENGINE lamp:
--None.
Test to detect fault:
--The diagnostic module sums the number of misfires of 5 successive monitoring periods (with 200 revolutions each). If the maximum permissible number to maintain the liM program threshold (Inspection and Maintenance program tailpipe emission test) is exceeded, a fault is recognized. The cylinder numbers and freeze frame data are stored.