Found a complete list of code on internet. Passing them on for others. It would be useful in having a master tech telling us what each means and what we could do tho fix them.


COMPUTER CODES for Mercedes Vehicles

This table may be used as a reference for interpreting your Mercedes vehicle's computer messages.

If codes other than these are indicated, repeat self-diagnosis. If codes reappear, substitute a known good ECM, and recheck codes. Codes flash the number of times for each malfunction. Example 28 times is code 28. # Flashes PROBABLE CAUSE for Mercedes vehicles 190E and 300 series (2.3L) 1990 thru 1993
1 No System Malfunctio
2 Throttle Valve Switch
3 Coolant Temperature Sensor
4 Airflow Sensor Position Indicator
5 Oxygen Sensor
6 Not Used
7 TD signal
8 Altitude Correction Capsule
9 Electro-Hydraulic Actuator (EHA)
10 Throttle valve Switch and /or Idle Speed Contact
11 Not Used
12 EGR Temperature Sensor
# Flashes PROBABLE CAUSE for Mercedes vehicles 300 series (2.8L and 3.2L) 1991 and later.
1 No fault in system
2 Oxygen sensor inoperative
3 Lambda Control inoperative
4 Air injection inoperative
5 Exhaust Gas Recirculation (EGR) inoperative
6 Idle Speed Control inoperative
7 Ignition System failure
8 Coolant Temperature Sensor - Open or short circuit
9 Intake Air Temperature Sensor - Open or shor circuit
10 Voltage at Air Mass Sensor too high or low
11 TN (RPM) signal defective
12 Oxygen Sensor heater open or short circuit
13 Camshaft Position Sensor signal from - EZL/AKR Ignition Control Unit defective
14 Intake manifold pressure at start too low
15 Fuel throttle information defective
16 Idle speed information defective
17 Controller Area Network (CAN) data exchange - malfunction between units
18 Adjustable Camshaft Timing Solenoid - open or short circuit
19 Fuel injectors - open or short circuit, or Emission Control System Adaptation at limit
20 Speed signal missing
21 Purge switchover valve - open or shot circuit
22 Camshaft Position Sensor signal defective
23 Intake Manifold Pressure with engine running too low
24 Starter ring gear segments defective
25 Knock Sensor defective
26 Upshift Delay Switchover Valve - open or short circuit
27 Coolant Temperature Sensor deviation between circuit No. 1 and sensor circuit No. 2
28 Coolant Temperature Sensor (Coolant Temperature Change Monitor)



# Flashes PROBABLE CAUSE for Mercedes 190E & 300 series (2.6L & 3.0L) 1991 thru 1993
1 No faults in system
2 Throttle Valve Switch (full throttle contact)
3 Coolant Temperature Sensor
4 Airflow Sensor Potentiometer
5 Oxygen Sensor
6 Not Assigned
7 TNA (engine RPM signal)
8 Altitude Pressure signal from EZL Ignition Control Unit
9 Current to Electro-hydraulic Actuator
10 Throttle Valve Switch (Idle Contact)
11 Air Injection system
12 Absolute Pressure valves from EZL Ignition Control Unit
13 Intake Air Temperature signal
14 Road Speed signal at CIS-E Control Unit
15 Not assigned
16 Exhaust Gas Recirculation (EGR)
17 Oxygen Sensor signal
18 Current to Idle Speed Air Valve
19 Not Assigned
20 Not Assigned
21 Not Assigned
22 Oxygen Sensor heating current
23 Short circuit to positive in Regeneration Switchover valve circuit
24 Not Assigned
25 Short circuit to positive in Start Valve circuit
26 Short circuit to positive in Shift Point Retard circuit
27 Data exchange fault between CIS-E Control Unit and EZL Ignition Control Unit
28 Loose contact in Coolant Temperature circuit
29 Difference in Coolant Temperatures between CIS-E Control Unit and EZL Ignition Control Unit
30 Not Assigned
31 Loose contact in Intake Air Temperature circuit
32 Not Assigned
33 Not Assigned
34 Faulty Coolant Temperature signal from EZL Ignition Control Unit


Disclaimer:
Use this as a guide, not a Bible. These codes are assumed current through 1997. No warranties or guarantees as to correctness or fitness for use is stated or may be implied.