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Mercedes-Benz Engine Control Fault Codes List
MR fault codes in Mercedes-Benz vehicles detect if there are malfunctions with the engine – speed is too high, charge pressure deviation is too large, charge pressure for braking operation is not reached or the oil pressure is too low.
Mercedes-Benz Engine Control Fault Codes List
MR fault codes in Mercedes-Benz vehicles detect if there are malfunctions with the engine – speed is too high, charge pressure deviation is too large, charge pressure for braking operation is not reached or the oil pressure is too low.
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| CODE | DESCRIPTION |
|---|---|
| MR0101 | Can-L-Link To The Faulty Fr |
| MR0102 | Data From The Control Unit Fr (Motion Control) Wrong |
| MR0104 | Can-Connection To Faulty Fr |
| MR0149 | Can Parameterization Error |
| MR0204 | Can-High-Wire To The Scr-Module Frame (Euro 4 Or Euro 5) Is Faulty. |
| MR0308 | Crankshaft Position Sensor, A Short To Ground |
| MR0309 | Crankshaft Position Sensor, A Circuit Break |
| MR0310 | Crankshaft Position Sensor: The Signal Is Too Weak |
| MR0311 | Crankshaft Position Sensor: Incorrect Synchronization Of Crankshaft And Camshaft Signals. |
| MR0312 | Crankshaft Position Sensor: No Signal |
| MR0313 | Crankshaft Position Sensor: Wrong Polarity. |
| MR0408 | Sensor Camshaft Position, A Short To Ground |
| MR0409 | Sensor Camshaft Position, A Circuit Break |
| MR0412 | Camshaft Position Sensor: No Signal |
| MR0413 | Camshaft Position Sensor: Wrong Polarity |
| MR0530 | Exceeding Speed |
| MR0612 | Signal 'Fan Speed' Is Missing. |
| MR0631 | Fan Speed Too Low. |
| MR0722 | After The Temperature Of The Catalyst Is Too High. |
| MR0782 | The Catalyst Is Absent. |
| MR0788 | Before The Catalyst Temperature Is Too High (The Threshold Value Is Exceeded 1). |
| MR0789 | Before The Catalyst Temperature Is Too High (The Threshold Value Is Exceeded 2). |
| MR0797 | Before The Catalyst Temperature Is Too High (Reduced Engine Power). |
| MR0815 | Temperature Sensor Before The Catalytic Converter Is A Circuit Break Or Short Circuit To Positive. |
| MR0816 | Temperature Sensor Before Catalytic Converter Has A Short To Ground. |
| MR0915 | Temperature Sensor After The Catalytic Converter Has A Circuit Break Or Short Circuit To Positive. |
| MR0916 | Temperature Sensor After The Catalytic Converter Has A Short To Ground. |
| MR1015 | Oil Temperature Sensor Has Exceeded The Measuring Range (Short To Positive, A Circuit Break). |
| MR1016 | Oil Temperature Sensor Has Not Reached The Minimum Value Of The Measuring Range (Short To Ground). |
| MR1115 | Fuel Temperature Sensor Has Exceeded The Measuring Range (Short To Positive, A Circuit Break). |
| MR1116 | Fuel Temperature Sensor Has Not Reached The Minimum Value Of The Measuring Range (Short To Ground). |
| MR1215 | Combined Sensor 'Boost Pressure And The Temperature Of The Charge Air': Temperature Sensor, The Measurement Range Is Exceeded (Short To Positive, A Circuit Break) |
| MR1216 | Combined Sensor 'Boost Pressure And The Temperature Of The Charge Air': The Temperature Sensor Is Not Reached At Least The Measuring Range (Short To Ground) |
| MR1315 | The Atmospheric Pressure Sensor, Measuring Range Is Exceeded (Short To Positive, A Circuit Break). |
| MR1316 | The Atmospheric Pressure Sensor Is Not Reached The Minimum Value Of The Measuring Range (Short To Ground). |
| MR1415 | Combined Sensor 'Boost Pressure And The Temperature Of The Charge Air': A Pressure Sensor, The Measurement Range Is Exceeded (Short To Positive, A Circuit Break) |
| MR1416 | Combined Sensor 'Boost Pressure And The Temperature Of The Charge Air': Pressure Sensor Does Not Reach The Minimum Measuring Range (Short To Ground) |
| MR1417 | Combined Sensor 'Boost Pressure And The Temperature Of The Charge Air': A Pressure Sensor, The Measured Value Is Invalid |
| MR1515 | Sensor, The Measurement Range Is Exceeded The Coolant Temperature (Short To Positive, A Circuit Break). |
| MR1516 | The Coolant Temperature Sensor Is Not Reached The Minimum Value Of The Measuring Range (Short To Ground). |
| MR1615 | Oil Pressure Sensor, Measuring Range Is Exceeded (Short To Positive, A Circuit Break). |
| MR1616 | Oil Pressure Switch Not Reached The Minimum Value Of The Measuring Range (Short To Ground). |
| MR1617 | Oil Pressure Sensor, The Measured Value Is Invalid |
| MR1715 | Combined Active Exceeded The Measuring Range |
| MR1716 | Combined Active Reach The Minimum Measuring Range |
| MR1717 | Combined Active Implausible Signal |
| MR1818 | Discharge Circuit Is Faulty |
| MR1820 | Boost Pressure Is Exceeded |
| MR1822 | The Temperature Of The Charge Air Is Exceeded |
| MR1873 | The Speed Of The Turbocharger Is A Violation Of Uniform Motion. |
| MR1874 | Deviation Setpoint Charge Air Pressure Regulation Is Too High. |
| MR1876 | Charge Pressure For Braking Mode Is Not Enough. |
| MR1878 | Discharge Circuit Is Faulty |
| MR1917 | The Measured Fuel Pressure Sensor Value Is Invalid. |
| MR2017 | The Measured Oil Pressure Sensor Value Is Invalid. |
| MR2020 | The Oil Pressure Is Too Low. |
| MR2021 | The Oil Pressure Is Too Low. |
| MR2026 | Engine Oil Level Is Too High Or Too Low. |
| MR2122 | The Coolant Temperature Is Too High. |
| MR2219 | Mr Terminal 15 Of The Control Unit Or Fr Has A Circuit Break. |
| MR2319 | Mr Terminal 50 Of The Control Unit Or Fr Has A Circuit Break. |
| MR2415 | The Differential Fuel Pressure Sensor Has A Circuit Break. |
| MR2416 | The Differential Fuel Pressure Sensor Has Short To Positive, Mass. |
| MR2509 | The Oil Level Sensor: A Circuit Break |
| MR2515 | Oil Level Sensor Short Circuit To Positive, The Measurement Range Is Exceeded |
| MR2516 | Oil Level Sensor, A Short To Ground, Do Not Reach The Minimum Measuring Range |
| MR2517 | The Oil Level Sensor: The Measured Value Is Invalid |
| MR2612 | Turbocharger Speed Sensor Is A Circuit Break, Short To Ground, Short To Positive. |
| MR2615 | Turbocharger Speed Sensor Is Short To Positive, A Circuit Break. |
| MR2616 | Turbocharger Speed Sensor Is Short To Ground. |
| MR2712 | Signal Speed Of The Generator Is Missing (Time Out) .Or Turbocharger Speed Sensor Is A Circuit Break, Short To Ground, Short To Positive (Turbocharger 2). |
| MR2804 | Nox Sensor Is A Violation Of Bonds. |
| MR2815 | Nox Sensor Has A Short Circuit To Plus, A Circuit Break. |
| MR2816 | Nox Sensor Has A Short Circuit To Ground. |
| MR2971 | Too High Emission Of Nitrogen Oxides (1 Threshold Is Exceeded) |
| MR2972 | Too High Emission Of Nitrogen Oxides (2 Threshold Value Is Exceeded) |
| MR3015 | The Fuel Pressure Sensor, Measuring Range Is Exceeded (Short To Positive, A Circuit Break) |
| MR3016 | The Fuel Pressure Sensor, Will Not Reach The Minimum Measuring Range (Short To Ground) |
| MR3115 | Temperature Sensor 2 Has Charge Air Gap Circuits. |
| MR3116 | Temperature Sensor 2 Charge Air Has A Short Circuit. |
| MR3215 | Egr Sensor Temperature Has A Discontinuity Circuits. |
| MR3216 | Temperature Sensor For Exhaust Gas Recirculation System Has A Short Circuit. |
| MR3332 | Recirculated Exhaust Gas Temperature Sensor: Value Out Of Range. |
| MR3415 | Humidity Sensor Has A Short Circuit To Positive, A Circuit Break. |
| MR3416 | Humidity Sensor Has A Short Circuit To Ground. |
| MR3515 | Air Temperature Sensor Has A Short Circuit To Positive, A Circuit Break. |
| MR3516 | Air Temperature Sensor Has A Short Circuit To Ground. |
| MR3604 | No Can Message 'Temperature'. |
| MR3617 | Measured Ambient Air Temperature Sensor Value Is Invalid. |
| MR3706 | Valve Incorporating Scr Compressed Air Has A Short To Ground. |
| MR3707 | Valve Switching Compressed Air Scr Has Short To Positive. |
| MR3709 | Valve Incorporating Scr Compressed Air Has A Circuit Break. |
| MR3817 | The Measured Values Of The Temperature Sensors On Unreliable Catalyst. |
| MR3906 | Adblue Pump Has A Short To Ground. |
| MR3907 | Adblue Pump Has A Short Circuit To Positive. |
| MR3909 | Adblue Pump Is A Circuit Break. |
| MR4024 | Internal Fault In The Control Unit |
| MR4034 | Internal Fault In The Control Unit |
| MR4035 | Internal Fault In The Control Unit |
| MR4036 | Internal Fault In The Control Unit |
| MR4037 | Internal Fault In The Control Unit |
| MR4038 | Internal Fault In The Control Unit |
| MR4039 | Starter Control (Output Stage) Faulty |
| MR4040 | Internal Fault In The Control Unit |
| MR4041 | Internal Fault In The Control Unit |
| MR4047 | Internal Fault In The Control Unit |
| MR4048 | Internal Fault In The Control Unit |
| MR4049 | Invalid Parameterization Of Proportional Valves |
| MR4050 | Internal Fault In The Control Unit |
| MR4051 | Internal Fault In The Control Unit |
| MR4052 | Internal Fault In The Control Unit |
| MR4053 | Internal Fault In The Control Unit |
| MR4054 | Internal Fault In The Control Unit |
| MR4056 | Internal Fault In The Control Unit |
| MR4058 | Mr Data Block Adjusting Engine Control Unit (Pld) Has Been Changed. |
| MR4092 | Internal Fault In The Control Unit |
| MR4149 | Engine Brake Parameterized Incorrectly. |
| MR4200 | Proportional Valve 5 Has Short To Positive. |
| MR4201 | Proportional Valve 5 Has A Short To Ground. |
| MR4202 | Proportional Valve 7 Has A Short To Ground. |
| MR4203 | Proportional Valve 7 Is A Circuit Break. |
| MR4204 | Proportional Valve 7 Has A Short Circuit To Positive. |
| CODE | DESCRIPTION |
|---|---|
| MR4205 | Throttle Position Sensor Has A Short Circuit To Positive, A Circuit Break. |
| MR4206 | Throttle Position Sensor Has A Short To Ground. |
| MR4207 | Temperature Sensor To A Diesel Oxidation Catalyst Has A Short Circuit To Positive, A Circuit Break. |
| MR4208 | Temperature Sensor To A Diesel Oxidation Catalyst Has A Short To Ground. |
| MR4209 | Temperature Sensor For The Diesel Oxidation Catalyst Has A Short Circuit To Positive, A Circuit Break. |
| MR4210 | Temperature Sensor For The Diesel Oxidation Catalyst Has A Short To Ground. |
| MR4211 | Differential Pressure Sensor Before The Particulate Filter Has Short To Positive, A Circuit Break. |
| MR4212 | Differential Pressure Sensor In Front Of The Diesel Particulate Filter Has A Short To Ground. |
| MR4213 | Differential Pressure Sensor For The Diesel Particulate Filter Has A Short Circuit To Positive, A Circuit Break. |
| MR4214 | Differential Pressure Sensor For The Diesel Particulate Filter Has A Short To Ground. |
| MR4215 | Differential Pressure In The Particulate Filter Is Too Large. |
| MR4216 | Differential Pressure In The Particulate Filter Is Too Small. |
| MR4217 | Adjusting Throttle Deviation Is Too Large. |
| MR4218 | Set Up The Throttle Failed. |
| MR4219 | Diffuser In Adblue Dispenser Is Clogged. |
| MR4220 | Dispenser Dirty |
| MR4221 | Heating Of The Diffuser Has A Circuit Break. |
| MR4222 | Heating Of The Diffuser Has A Short To Ground. |
| MR4223 | Heating Of The Diffuser Has A Short Circuit To Positive. |
| MR4224 | Internal Fault In The Control Unit |
| MR4225 | Proportional Valve 1 Has A Number Of Short To Positive. |
| MR4226 | Proportional Valve Number 1 Has A Short To Ground. |
| MR4227 | Internal Fault In The Control Unit |
| MR4228 | No Sort Components. |
| MR4229 | Measured Value Sort Temperature Sensors (Pair A) Is Uncertain. |
| MR4230 | Measured Value Sort Temperature (Pair B) Sensors Unreliable. |
| MR4231 | Diesel Particulate Filter Is Not Installed. |
| MR4232 | The Measured Value Of The Differential Pressure Sensor In Front Of The Particulate Filter Is Uncertain. |
| MR4233 | The Measured Differential Pressure Sensor Value After The Particulate Filter Is Uncertain. |
| MR4234 | Too High Emission Of Nitrogen Oxides As A Result Of Unknown Cause (2 Threshold Value Is Exceeded) |
| MR4235 | Too High Emission Of Nitrogen Oxides Due To The Low Quality Of Adblue |
| MR4236 | Too High Vfros Nitrogen Oxides Due To Insufficient Dosing Of Adblue |
| MR4237 | Measured Value Of The Nox Sensor Is Uncertain. |
| MR4238 | The Temperature In The Particulate Filter Is Too Low. |
| MR4239 | Sensor Unit 1 In The Mr Control Unit Has A Short Circuit. |
| MR4240 | Sensor Unit 2 In The Mr Control Unit Has A Short Circuit. |
| MR4241 | Sensor Unit 1 In The Scr Module On The Frame Has A Closure. |
| MR4242 | Sensor Unit 2 In The Scr Module On The Frame Has A Closure. |
| MR4243 | Sensor Unit 3 In The Scr Module On The Frame Has A Closure. |
| MR4244 | Nox Sensor Malfunction |
| MR4245 | Faulty Structural Unit 'Of Nox Sensor'. |
| MR4246 | Too High An Initial Release Of Nitric Oxide |
| MR4247 | Faulty Constructive 'Catalyst' Node. |
| MR4248 | Poor Quality Or Insufficient Dosing Of Adblue Adblue |
| MR4249 | Too High Emission Of Nitrogen Oxides |
| MR4415 | Differential Pressure Sensor Before The Particulate Filter Has Short To Positive, A Circuit Break. |
| MR4416 | Differential Pressure Sensor In Front Of The Diesel Particulate Filter Has A Short To Ground. |
| MR4805 | Pump-Nozzle Number 1 Has Short To Positive. |
| MR4806 | Return Pump Nozzles Number 1 Has A Short To Ground. |
| MR4905 | Pump-Nozzle 2 Has A Number Of Short To Positive. |
| MR4906 | Return Of The Pump-Injector Number 2 Has A Short To Ground. |
| MR5026 | Pump-Injector Cylinder 1: The Valve Does Not Open |
| MR5027 | Pump-Injector Cylinder 1: Fault Management |
| MR5028 | Pump-Injector Cylinder 1: Short Circuit |
| MR5126 | Pump-Injector Cylinder 2: The Valve Does Not Open |
| MR5127 | Pump-Injector Cylinder 2: Control Fault |
| MR5128 | Pump-Injector 2 Short Circuit |
| MR5226 | Pump-Injector Cylinder 3: The Valve Does Not Open |
| MR5227 | Pump-Injector Cylinder 3: Fault Management |
| MR5228 | Pump-Injector Cylinder 3: Short Circuit |
| MR5326 | Pump-Injector Cylinder 4: The Valve Does Not Open |
| MR5327 | Pump-Injector Cylinder 4: Fault Management |
| MR5328 | Pump-Cylinder Injector 4 Short Circuit |
| MR5426 | Pump-Injector Cylinder 5: The Valve Does Not Open |
| MR5427 | Pump-Injector Cylinder 5: Fault Management |
| MR5428 | Pump-Injector Cylinder 5: Short Circuit |
| MR5526 | Pump-Injector Cylinder 6: The Valve Does Not Open |
| MR5527 | Pump-Injector Cylinder 6: Control Fault |
| MR5528 | Pump-Injector Cylinder 6: Short Circuit |
| MR5626 | Pump-Injector Cylinder 7: The Valve Does Not Open |
| MR5627 | Pump-Cylinder Injector 7: Control Fault |
| MR5628 | Pump-Injector Cylinder 7: Short Circuit |
| MR5726 | Pump-Injector Cylinder 8: The Valve Does Not Open |
| MR5727 | Pump-Injector Cylinder 8: Fault Management |
| MR5728 | Pump-Injector Cylinder 8: Short Circuit |
| MR5806 | Adblue Heating Pipe Has A Short To Ground. |
| MR5807 | Adblue Heating Pipe Has A Short Circuit To Positive. |
| MR5809 | Adblue Heating Pipe Has A Circuit Break. |
| MR5869 | Adblue Heating Pipe Is Defective. |
| MR5906 | Solenoid Valve For Heating Adblue Tank Has A Short To Ground. |
| MR5907 | Solenoid Valve For Heating Adblue Tank Has Short To Positive. |
| MR5909 | Magnetic Adblue Heating Valve Has A Gap Circuits. |
| MR5969 | Valve Heating Adblue Tank Is Defective. |
| MR6015 | Adblue Level Sensor Has A Short Circuit To Positive, A Circuit Break. |
| MR6016 | Adblue Level Sensor Has A Short Circuit To Ground. |
| MR6029 | Adblue Tank Fill Level Is Too Low. |
| MR6115 | Adblue Tank Temperature Sensor Has Short To Positive, A Circuit Break. |
| MR6116 | Adblue Tank Temperature Sensor Is Short To Ground. |
| MR6169 | Sensor 'Fill Rate / Temperature Of The Adblue Tank' Is Defective. |
| MR6293 | Internal Fault In The Scr Module On The Frame |
| MR6327 | Activating The Obd Lamp Broken. |
| MR6409 | Heating Flange Has A Gap Circuits. |
| MR6432 | Problem Heated Flange |
| MR6506 | Diagnostic Separator Wire Has A Short Circuit To Ground. |
| MR6564 | Diagnostic Cable Separator Has A Circuit Break Or Short Circuit To Positive. |
| MR6678 | Exhaust Gas Recirculation Valve Is Faulty. |
| MR6679 | The Temperature Difference Between The Exhaust Gases And Cooling Fluid Is Unreliable. |
| MR6720 | Adblue Pressure Is Too High. |
| MR6721 | Adblue Pressure Is Too Low. |
| MR6770 | Adblue Pressure Drop At Pump Run Too Little. |
| MR6777 | Adblue Pump Current Consumption Is Too High. |
| MR6820 | Scr Compressed Air Pressure Is Too High. |
| MR6821 | Compressed Air Pressure Is Too Low Scr. |
| MR6883 | Air Supply Scr Compressed Air System Is Broken. |
| MR6949 | Parameterization Error |
| MR6994 | Exhaust Gas Aftertreatment System Is Turned Off And The Diagnostic Program Is Active |
| MR6995 | Exhaust Gas Aftertreatment System Is Turned Off And The Diagnostic Program Is Active |
| MR7006 | Proportional Valve 1 Has A Short To Ground. |
| MR7007 | Proportional Valve 1 Has A Short Circuit To Positive. |
| MR7009 | Proportional Valve 1 Has A Circuit Break. |
| MR7106 | Solenoid Valve 3: Fan Stage 1 Has A Short To Ground. |
| MR7107 | Proportional Valve 3 Has A Short Circuit To Positive. |
| MR7109 | Solenoid Valve 3: Fan Stage 1 Is A Circuit Break. |
| MR7112 | Solenoid Valve 3: Increases The Fan Drive - No Fan Speed |
| MR7206 | Solenoid Valve 4: Fan Stage 2 Is Shorted To Ground. |
| MR7207 | Proportional Valve 4 Has A Short Circuit To Positive. |
| MR7209 | Solenoid Valve 4: Fan Stage 2 Is A Circuit Break. |
| MR7305 | Solenoid Valve 2: Brake Decompression Valve Has A Short Circuit To Positive. |
| MR7306 | Solenoid Valve 2: Brake Decompression Valve Has A Short To Ground. |
| MR7307 | Proportional Valve 2 Has A Short Circuit To Positive. |
| MR7309 | Proportional Valve 2 Has A Circuit Break. |
| MR7317 | Solenoid Valve 2: Brake Decompression Valve Has A Circuit Break Or Short Circuit To Ground. |