Mercedes Fuel Injection - Auto Repair Codes

Scan Tool for Codes and Live Data for your Mercedes Engine from $199 USD

The information below may apply to Mercedes E300, 500E, SL, SE, SEL & SEC and many other models

Step 4

Mercedes EFI Code Reading

Connector Diagram

Auto Repair Manual - How to read codes (No Special Tools Needed)

1 Drive vehicle until it reaches operating temperature.

2 Stop the vehicle, place it in park or neutral and turn ignition OFF.

3 Connect an LED tester or Voltmeter to terminals 'A' & 'B'. (Click here for details) 

4 Connect a switch as shown on the diagram. (Click here for details) 

5 The connector will be at the rear of the engine bay on the left or right side.

NOTE -Only one code can be accessed at a time, to get the next code close switch for 2 to 4 seconds

6 Read codes as described in the Code Format Description below.

7 Press the continue button to enter the code numbers and get the code description(s).

Code Format Diagram

Code Format Description

• Each flash codes is represented by straight count. Twenty flashes indicates the code "20".

• Each flash lasts for 0.5 seconds, and there is a 1-second pause between each digit.

• Count the number of flashes in each series, and record the code.

To move to the next screen click on the Continue button

 Reset Service Light...  Continue > 

Note on Example Model(s): Mercedes E300, 500E, SL, SE, SEL & SEC
The example model(s) shown, Mercedes E300, 500E, SL, SE, SEL & SEC for this auto repair service are only an indication to help you. There may be many other models that apply to this connector. Click above link to see the complete vehicle coverage list.