Mercedes Benz A-Class Fault Codes
You can find common Mercedes Benz A-Class fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
Jump To:Search Mercedes Benz A-Class Codes Mercedes Benz A-Class Recall Notices Common Mercedes Benz A-Class Codes
Search Mercedes Benz A-Class Codes
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Mercedes Benz A-Class Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Mercedes Benz A-Class has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Mercedes Benz A-Class Recalls »
Common A-Class Fault Codes
These are the most common A-Class fault codes that people are searching for.
Injector Circuit Malfunction - Cylinder 1Learn More
Crankshaft Position Sensor A Circuit MalfunctionLearn More Fixes
MAP / MAF - Throttle Position CorrelationLearn More Fixes
Mass or Volume Air flow Circuit MalfunctionLearn More Fixes
Transmission Control System MalfunctionLearn More Fixes
Serial Communication Link MalfunctionLearn More
Exhaust Gas Recirculation Flow Insufficient DetectedLearn More Fixes
Fuel Trim Malfunction (Bank 1)Learn More Fixes
Cylinder 2 Misfire DetectedLearn More Fixes
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
Evaporative Emissions System Small Leak DetectedLearn More Fixes
System Too Lean (Bank 1)Learn More Fixes
Glow Plug/Heater Circuit A Malfunction More details...Learn More Fixes
System Too Rich (Bank 1)Learn More Fixes
Thermostat Heater Control Circuit HighLearn More
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn More Fixes
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor BLearn More Fixes
Contr. Module LockedLearn More
Intake Manifold Runner Control Stuck Closed Bank 1Learn More
System Gross Leak Evaporative EmissionLearn More Fixes
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
Diesel Particulate Filter Restriction - Soot AccumulationLearn More
Secondary Air Injection System MalfunctionLearn More
Incorrect Gear RatioLearn More
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
Hydraulic Base Brake FailureLearn More
ABS Acceleration Switch Circuit FailureLearn More
ABS Outlet Valve Coil RF Circuit FailureLearn More
ABS Hydraulic Valve Circuit FailureLearn More
PRNDL Switch Circuit FailureLearn More
Transmission Range Sensor Circuit Malfunction (PRNDL Input)Learn More Fixes
Turbo / Super Charger UnderboostLearn More Fixes
Lost Communication With Instrument Panel Cluster (IPC) Control ModuleLearn More Fixes
Lost Communication With Anti-Lock Brake System (ABS) Control ModuleLearn More
Control Module Communication Bus "A" OffLearn More Fixes
Lost Communication With Glow Plug Control ModuleLearn More Fixes
Lost Communication with TCMLearn More
Intake Manifold Runner Control (Stuck Closed)Learn More
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To GroundLearn More
Calibration Resistor Out Of RangeLearn More
4X4 Initialization FailureLearn More
PSP Switch Out of Self Test RangeLearn More
Transmission Transfer Case Contact Plate 'D' Circuit FailureLearn More
Transmission Transfer Case Shift Motor Short Circuit To BatteryLearn More
Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit FailureLearn More
Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit FailureLearn More
DPFE Sensor Upstream Hose Off Or PluggedLearn More
EGR Flow Out Of Self Test RangeLearn More
Dual Alternator Upper FaultLearn More
Pump Speed Signal FaultLearn More
Inductive Signature Chip Communication ErrorLearn More
DPFE Circuit Low InputLearn More
Fuel Tank Pressure Relief Valve MalfunctionLearn More
GLOW PLUG FAILURELearn More
Traction Control Output Circuit MalfunctionLearn More
Ignition Coil C Primary Circuit MalfunctionLearn More
Intake Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Intake Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Intake Camshaft Position Timing - Over-Retarded (Bank 1)Learn More Fixes
Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2Learn More Fixes
Mass or Volume Air Flow Circuit Low Voltage InputLearn More Fixes
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance ProblemLearn More Fixes
Intake Air Temperature Circuit High InputLearn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)Learn More Fixes
System Too Rich (Bank 2)Learn More Fixes
Cylinder 1 Misfire DetectedLearn More Fixes
Cylinder 3 Misfire DetectedLearn More Fixes
Cylinder 4 Misfire DetectedLearn More Fixes
- Manufacturer: Mercedes Benz
About the A-Class
The A-Class first entered the market as a subcompact in 1997. It later pivoted into the subcompact executive class in 2013. This huge change in terms of styling was done to allow the model to compete with the emerging popularity of the subcompact executive class.
Rivals in the class include the BMW 1 Series, Audi A3 Sportback, and Ford Focus, among many others.
There have been four generations of the A-Class to hit the markets, with the latest making its debut in 2018. Although, it is hard to consider the first and second generations as the same model as today’s offering.
The most common problem owner’s have reported is fault code P0201, which represents a malfunction with the fuel injector for the first cylinder. This has caused owner’s a host of driveability issues, including misfires.
Of course, one of the most likely causes is a faulty fuel injector for the first cylinder. However, it is typically logged with the same code for the other cylinders. This can indicate the problem is somewhere upstream in the fuel system, which can mean there are faulty components responsible for supplying and pressurizing the fuel.
Another fairly common issue is P0335, which indicates that there is a problem with the crankshaft position sensor. Owners have reported that a faulty crankshaft position sensor is one of the most likely causes, but faults in the sensor’s circuit can also be the culprit.
The A-Class is also somewhat known to suffer from P0068, which represents an issue with the signal from the mass airflow (MAF) sensor, manifold absolute pressure (MAP) sensor, and throttle position sensor.
Owners have reported that faulty sensors are one of the most common causes for this issue, which can be a simple fix.