Mercedes Check Engine Light Codes

Welcome to the Mercedes Check Engine Light codes page. Below you will find the most complete list of Mercedes trouble codes available. The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there? We have a large number of resources to help you repair the problem. Here is how we suggest you proceed. Look up your code definition. This tells you where to start testing. If you are unsure of any abbreviations, check out the acronym list by clicking on the link at the left.

Next, read our article Automotive Circuit Testing 101, and if there is an article related to the system you are testing, such as Oxygen Sensors or EGR concerns, read these as well. They will provide valuable info! If there is a link to a specific diagnosis strategy for the code then follow that and start testing. If there is no procedure for your manufacturer specific code, then I suggest referring to a similar generic OBD II code (these are listed numerically by system type) to get a good idea of what to look for. If at this point you still need assistance use the "Get Help" link and let us know how we can help. We can provide information on component location, specifications, circuit color/location and more. We do ask that you please read the info available on the site first so that we can help reduce repeat questions. So please read our Disclaimer and when you're ready jump in!

Also we value your feedback and like to hear stories of unusual fixes or concerns you may have run into with your Check Engine Light, so feel free to share your experiences by using the "Contact Us" link. Let's go!

When retrieving Mercedes check engine light codes with an OBD II scan tool, proceed as follows:
1. Connect scan tool to the 16-pin data link connector (DLC)
2. Turn the ignition On.
3. Follow scan tool manufacturer's operating instructions to retrieve the Diagnostic Trouble Codes (DTC's).

Remember, these are manufacturer specific codes only. Refer to our Generic OBD II code list for definitions of all other Mercedes check engine light codes.

Manufacturer Specific Codes
P1105 Atmospheric Pressure Sensor In Control Module

P1220 Fuel Quantity Actuator (Y23/1)

P1221 CAN Communication, ETC Or ETS Interrupted

P1222 IFI Accelerator Pedal Position Sensor (R25/2)

P1223 Fuel Rack Position Sensor (Y23/1/1)

P1335 CKP Sensor (IFI)

P1350 Injection Sensor Solenoid

P1351 Injection Sensor Circuit

P1352 Needle Lift Sensor

P1401 EGR Lifting Sender (B28/3)

P1404 EGR Control

P1465 EPW Power

P1470 Pressure Control Flap Vacuum Transducer (Y31/2)

P1475 Resonance Intake Line Switchover Valve (Y22/7)

P1476 Resonance Intake Manifold Switchover Valve (Y22/6)

P1480 Preglow Control

P1481 Glow Plug Failure

P1482 Preglow Control Module (N14/2)

P1520 Cruise Control Switch (S40)

P1610 Voltage Supply Missing Or Relay Module (K40)

P1611 IFI Control Module (N3/7)

P1612 IFI Control Module (N3/7) Voltage, Circuit 15

P1613 IFI Control Module (N3/7)

P1614 IFI Control Module (N3/7) Voltage Or Fuel Metering Actuator (Y23/1K1) Or Fuel Rack Postion Sensor (Y23/1/1)

P1615 IFI Control Module (N3/7) Supply Voltage

P1617 Control Module Fault Or Control Module Not Coded

P1622 Electrohydraulic Shut-Off Actuator (Y1/1)

P1625 Check Engine MIL

P1630 Drive Authorization Signal

P1705 Starter Lock-Out/Backup Lamp Switch (S16/1)

P1780 Modulation Pressure Switchover Valve (AT/CC) (Y3/4) Or Upshift Delay Switchover Valve (AT/CC) (Y3/5)

P1781 Upshift Delay Switchover Valve (AT/CC) (Y3/5)

Please verify the Mercedes check engine light code descriptions and testing procedures from our site, with an appropriate manual. Due to the amount of free content we provide, we cannot guarantee the accuracy of all information. We bend over backwards to make this information as accurate as possible, but sometimes we can make mistakes. Don't tell anyone though! Thanks!

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