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Audi A4 Fault Codes


You can find common Audi A4 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.

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Do you know the fault code already? Enter it in the box below and hit "Search Codes".

Audi A4 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 Audi A4 has any recall notices on our sister site AutoRecalls.co, sorted by model year.

View Audi A4 Recalls ยป
Recall Notice Icon
Severity Icon 9/10

Error Icon P0299

Turbo / Super Charger Underboost

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Severity Icon 8/10

Error Icon P0016

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

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Severity Icon 9/10

Error Icon P0300

Random/Multiple Cylinder Misfire Detected

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Severity Icon 8/10

Error Icon P0301

Cylinder 1 Misfire Detected

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Severity Icon 8/10

Error Icon P0302

Cylinder 2 Misfire Detected

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Severity Icon 7/10

Error Icon P0420

Catalyst System Efficiency Below Threshold (Bank 1)

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Severity Icon 9/10

Error Icon P0011

Intake Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 8/10

Error Icon P0303

Cylinder 3 Misfire Detected

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Severity Icon 8/10

Error Icon P0089

Fuel Pressure Regulator Performance

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Severity Icon 3/10

Error Icon P0507

Idle Control System RPM higher Than Expected

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Severity Icon 4/10

Error Icon P0411

Secondary Air Injection System Incorrect Flow Detected

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Severity Icon 3/10

Error Icon P0456

Evaporative Emissions System Small Leak Detected

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Severity Icon 7/10

Error Icon P0171

System Too Lean (Bank 1)

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Error Icon P2181

Cooling System Performance

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Error Icon P0444

Evaporative Emission Control System Purge Control Valve Circuit Open

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Error Icon P0480

Cooling Fan 1 Control Circuit Malfunction

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Severity Icon 3/10

Error Icon P0441

Evaporative Emission Control System Incorrect Purge flow

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Error Icon P0088

Fuel Rail/System Pressure - Too High

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Severity Icon 6/10

Error Icon P0174

System Too Lean (Bank 2)

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Severity Icon 4/10

Error Icon P0030

Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1

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Error Icon P0118

Engine Coolant Temperature Circuit High Input

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Error Icon P0243

Turbocharger Wastegate Solenoid A Malfunction

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Severity Icon 7/10

Error Icon P0010

Intake Camshaft Position Actuator Circuit / Open (Bank 1)

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Error Icon P0238

Turbocharger Boost Sensor A Circuit High

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Severity Icon 8/10

Error Icon P0068

MAP / MAF - Throttle Position Correlation

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Severity Icon 5/10

Error Icon P0140

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)

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Error Icon P00b7

Engine Coolant Flow Low/Performance

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Error Icon P0506

Idle Control System RPM lower Than Expected

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Severity Icon 8/10

Error Icon P0322

Ignition/Distributor Engine Speed Input Circuit No Signal

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Error Icon P0501

Vehicle Speed Sensor Range/Performance

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Severity Icon 9/10

Error Icon U0100

Lost Communication With ECM/PCM "A"

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Severity Icon 5/10

Error Icon P0172

System Too Rich (Bank 1)

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Error Icon P0706

Transmission Range Sensor Circuit Range/Performance

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Severity Icon 7/10

Error Icon P0245

Turbocharger Wastegate Solenoid A low

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Error Icon P2279

Intake Air System Leak

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Severity Icon 6/10

Error Icon P0341

Camshaft Position Sensor Circuit Range/Performance

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Error Icon P0421

Warm Up Catalyst Efficiency Below Threshold (Bank 1)

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Severity Icon 4/10

Error Icon P0455

System Gross Leak Evaporative Emission

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Error Icon P0688

ECM/PCM Power Relay Sense Circuit

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Severity Icon 8/10

Error Icon P0087

Fuel Rail/System Pressure - Too Low

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Error Icon P0864

TCM Communication Circuit Range/Performance

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Error Icon P1602

Power Supply (B+)

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Error Icon P1297

Connection turbocharger - throttle valve pressure hose

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Error Icon P1479

High Fan Control Primary Circuit Malfunction

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Error Icon P1857

Load Signal Error

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Error Icon P1093

Pre-Catalyst Fuel Trim Too Rich Bank 2

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Error Icon P1588

Engine mount solenoid

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Severity Icon 3/10

Error Icon P2015

Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1

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Severity Icon 5/10

Error Icon P2187

System Too Lean at Idle DTC

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Error Icon P1112

O2 Control (Bank 1) System too rich

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Error Icon P1545

Throttle Pos.Contr Malfunction

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Error Icon P1148

O2 Control (Bank

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Severity Icon 4/10

Error Icon P0031

Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1

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Severity Icon 6/10

Error Icon P0141

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

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Error Icon P1556

Charge Pressure Contr. Negative Deviation

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Error Icon P1292

Injector High Side Short To GND Or VBATT - Bank 2

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Error Icon P2188

System Too Lean at Idle Bank 1

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Severity Icon 9/10

Error Icon P0473

Exhaust Pressure Sensor High

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Severity Icon 6/10

Error Icon P1206

Cyl.6-Fuel Inj.Circ.

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Severity Icon 4/10

Error Icon P0102

Mass or Volume Air Flow Circuit Low Voltage Input

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Severity Icon 3/10

Error Icon P0429

Catalyst Heater Control Circuit (Bank 1)

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Severity Icon 6/10

Error Icon P0384

Glow Plug/Heater Circuit B

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Severity Icon 4/10

Error Icon P0532

A/C Refrigerant Pressure Sensor Circuit Low Input

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Error Icon P0116

Engine Coolant Temperature Circuit Range/Performance Problem

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Error Icon P1281

Injection Control Pressure Out Of Range High

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Severity Icon 6/10

Error Icon P0135

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

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Error Icon P0668

PCM / ECM / TCM Internal Temperature Sensor Circuit Low

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Severity Icon 7/10

Error Icon P0100

Mass or Volume Air flow Circuit Malfunction

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Error Icon U1113

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon U1123

SCP (J1850) Invalid or Missing Data for Odometer

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Error Icon U1111

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon U1017

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon U0101

Lost Communication with TCM

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Error Icon U1121

SCP (J1850) Invalid or Missing Data for Primary Id

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Error Icon P0256

Injection Pump Fuel Metering Control B Malfunction (Cam/Rotor/Injector)

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Error Icon P0457

Evaporative Emission Control System Leak Detected

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Audi A4 Image
  • Manufacturer: Audi

About the A4