Audi Engine Fault Codes

By | July 12, 2018

Deciphering of Audi engine fault codes

Audi Fault codes list

Audi Logo

Audi cars are equipped mainly with Bosch control systems, including: Bosch Motronic versions 2.3.2, 2.4, 3.2 and 3.8.2, Mono-Jetronic, Mono-Motronic 1.1 and 1.2, KE-Motronic 1.1 and 1.2, KE- 3 Jetronic, Simos, VAG Digifant, VAG MPi and VAG MPFi. All systems control the primary circuit of the ignition system, the fuel injectors and the idling system from one control module. The exception is Mono-Jetronic and KE-3 Jetronic, which control the fuel supply and idling separately.

Engine control systems have a self-diagnostic function that continuously analyzes the signals of the sensors and actuators of the engine and compares them with the reference values. If the diagnostic program detects a mismatch, one or more corresponding fault codes are recorded in the electronic control unit (ECU) memory. Fault codes will not appear in cases where the defective item is not under the control of the ACM and when a faulty situation is not provided for by its software.

Control systems installed on Audi vehicles can generate fault codes of two types – 4-digit (“flashing“) and 5-digit. In the process of improving Audi cars, the codes and ways of reading them changed. Cars that are currently in operation can be divided into three groups (the point of separation is not always obvious even for the same model).

  1. Some early release systems can only generate 4-character codes that can be retrieved using a warning light on the instrument panel (if one is provided), using an LED or code reader. Such systems include Mono-Jetronic and Mono-Motronic MA 1.2.1.
  2. Later systems can generate both 4- and 5-digit codes. 4-digit codes are read using the warning light (if any) or by means of an LED. A reader is required to extract 5-digit codes. Among these systems are: Bosch Motronic versions 2.3, 2.4 and 2.7, KE-3 Jetronic, KE-Matronic and Mono-Motronic (with the old 45-pin connector BEU).
  3. Even later systems generate only 5-digit fault codes, which can only be retrieved using a reader. Such systems include: Bosch Motronic versions 2.9, 3.2 and 3.8.2, Mono-Motronic MA1.2.2 (with a new 45-pin BEU connector), Simos, VAG Digifant (with 68-pin connector) and VAG MPi and MPFi.

The described Audi systems have a mode of limited controllability (a function known as “limp home” or “crash home”). This means that if some malfunctions occur (not all malfunctions cause this mode to be activated), the engine control system is guided not by the sensor readings, but by its reference value. This mode allows the car to reach the garage or service station for inspection and repair, albeit with less efficiency. After troubleshooting, the system returns to normal operation.

Diagnostic Connector Location

Mono-Jetronic (Audi 80 and 100 1.8i release until July 1988)
Above the fuel pump relay for “flashing” codes only.

Mono-Jetronic (Audi 80 and 100 1.8i release since August 1988)
Two 2-pin connectors in the passenger footwell for flashing codes and for the reader.

Bosch Mono-Motronic

Two 2-pin connectors in the passenger footwell for the passenger under the dashboard or in the fuse box on the left in the engine compartment next to the bulkhead. The connectors can be used both for extracting “flashing” codes, and for the reader. The BEU is usually located in the footwell on the driver’s or passenger’s side, or in the engine compartment behind the partition.

Bosch KE-3 Jetronic and KE-Motronic 1.1

Two 2-pin connectors under the cover above the pedals in the driver’s leg niche. The connectors can be used both for extracting “flashing” codes, and for the reader.

Bosch KE-Motronic 1.2 and Motronic 2.3

Two 2-pin connectors under the cover above the pedals in the driver’s leg niche, or three 2-pin connectors under the cover above the pedals in the driver’s footwell or in the fuse box in the engine compartment next to the partition. The connectors can be used both for extracting “flashing” codes, and for the reader.

Bosch Motronic 2.4

Four 2-pin connectors in the passenger footwell niche under the dashboard. The connectors can be used both for extracting “flashing” codes, and for the reader.

VAG Digifant

Two 2-pin connectors in the passenger footwell niche under the dashboard or in the fuse box in the engine compartment next to the partition. The connectors can only be used to connect the reader.

VAG MPi and MPFi

Two 2-pin connectors above the pedals in the driver’s leg niche, only for connecting the reader.

16-pin on-board diagnostics connector (models A3, including Bosch Motronic 3.2, 3.8.2 and Simos)
Located under the cover in the front console.

16-pin connector (other models) – Located under the cover in the rear console next to the ashtray.

Error reading of Audi cars without special reader

Mono-Jetronic (until July 1988)

  1. Start and warm up the engine to operating temperature. The trouble codes for the oxygen sensor can only appear after a road test of a duration of at least 10 minutes.
  2. Stop the engine and turn on the ignition.
  3. If the engine does not start, rotate it with the starter for at least 6 seconds and leave the ignition on.
  4. Using a fuse, short the test contacts over the fuel pump relay for at least 5 seconds.
  5. Remove the fuse and the fault lamp will flash.
  6. Count the number of flashes in the series and write down the code. To decode its value, refer to the decoding table for the codes.
  7. Each code will be repeated until you insert the fuse again. Insert and after 6 seconds remove the fuse. After that, the following code will blink.
  8. Continue to extract the codes until code 0000 appears, which means that there are no more codes in the BEU memory.
  9. If code 4444 appears at once, it means that no fault codes have been registered.
  10. At the end of the reading procedure, turn off the ignition.

Bosch Mono-Jetronic (after July 198V), KBJetronic. KE-Motranic 1.1 and 1.2, Motronic 2.3 and 2.4

  1. Connect the auxiliary switch to the jacks of the connectors. If the vehicle is not equipped with a fault light on the instrument panel, connect the LED also.
  2. Start and warm up the engine to operating temperature.
  3. Stop the engine and turn on the ignition.
  4. If the engine does not start, rotate it with the starter for at least 6 seconds and leave the ignition on.
  5. Close the auxiliary switch for at least 5 seconds. Open the switch and the LED or warning light will start transmitting fault codes, which are to be understood as follows.
  6. Four numbers are indicated by four series of flashes.
    • The first series of flashes means the first digit, the second series – the second digit, etc. up to the fourth.
    • Each series consists of several flashes lasting 1 or 3 seconds with short gaps between them. The numbers from 1 to 9 are indicated by 1-second flashes, and zero is indicated by a two-second flare.
    • One series from the other is separated by a pause of 3.5 seconds.
    • Code 1231 is reproduced as follows: one 1-second flash, a short pause, two 1-second flashes, a short pause, three 1-second flashes, a short pause, one 1-second flash. The ambassador’s postponement is 3.5 seconds and the code will be repeated.
  7. Count the number of flashes in the series and write down the code. To decode its value, refer to the decoding table for the codes.
  8. Each code will be repeated until you insert the fuse again. Insert and after 6 seconds remove the fuse. After that, the following code will blink.
  9. Continue to extract the codes until code 0000 appears, which means that there are no more codes in the BEU memory.
  10. If code 4444 appears at once, it means that no fault codes have been registered.
  11. At the end of the reading procedure, turn off the ignition and disconnect the LED and switch.

Bosch Mono-Motronic (35-pin version of the connector BEU 1.2.1 and 45-pin version 1.2.2)

  1. Connect the auxiliary switch to the diagnostic sockets. If the vehicle is not equipped with a fault light on the instrument panel, connect also the LED between the (+) power supply and pin 33 of the BEU connector (for the 35-pin connector) or pin 3 (for the 45-pin connector). It will be necessary to detach the rear of the ECU connector to get to the correct pin without disconnecting the connector.
  2. Start and warm up the engine to operating temperature. The trouble codes for the oxygen sensor can only appear after a road test of a duration of at least 10 minutes.
  3. Stop the engine and turn on the ignition.
  4. If the engine does not start, rotate it with the starter for at least 6 seconds and leave the ignition on.
  5. Close the auxiliary switch for at least 5 seconds. Open the switch and the LED or warning light will start transmitting fault codes, which are to be understood as follows.
    • Four numbers are indicated by four series of flashes.
    • The first series of flashes means the first digit, the second series – the second digit, etc. up to the fourth.
    • Each series consists of several flashes lasting 1 or 2 seconds with short gaps between them. The numbers from 1 to 9 are indicated by 1-second flashes, and zero is indicated by a two-second flare.
    • One series from the other is separated by a pause of 2.5 seconds.
    • Code 1231 is reproduced as follows: one 1-second flash, a short pause, two 1-second flashes, a short pause, three 1-second flashes, a short pause, one 1-second flash. After 2.5 seconds, the code will be repeated.
  6. Count the number of flashes in the series and write down the code.
  7. Each code will be repeated until you again close the auxiliary switch for at least 5.0 seconds, and then open it. After that, the following code will blink.
  8. Continue to extract the codes until code 0000 appears, which means that there are no more codes in the BEU memory.
  9. If code 4444 appears at once, it means that no fault codes have been registered.
  10. At the end of the reading procedure, turn off the ignition and disconnect the LED and switch.
  11. Systems with a 16-pin on-board diagnostics connector or a 64-pin BEU connector – “Flashing” codes are not provided. It is necessary to use the code reader.

Removing the code from memory without the assistance of the reader

Bosch Mono-Jetronic, Mono-Motronic, KE-Jetronic and KE-Motronic

  1. To extract the codes, use the procedure described above.
  2. Turn the ignition off.
  3. Short the test contacts with the fuse over the fuel pump relay (Mono-Jetronic only until July 1988) or short-circuit the auxiliary switch (other systems).
  4. Turn the ignition on.
  5. After 5 seconds, open the switch or remove the fuse. All codes in memory will be erased.
  6. Turn the ignition off.
  7. Turn the ignition off and remove the key. Disconnect the BEU connector for at least 30 seconds.

All systems (alternative method)

  1. Turn the ignition off and disconnect the negative battery cable for about 5 minutes.
  2. Reconnect the wire to the battery. The first drawback of this method is that the BEU will reset all the adapted parameter values ​​to its original state. In order to re-adjust the system to your engine, it will be necessary to start the engine from the hoop condition, and then ride the car at different engine speeds of 20 … 30 minutes. In addition, it is necessary to let the engine idle for about 10 minutes. The second drawback is that you will have to reset the protective code of the radio, the current time and other stored values, which will also be reset when the battery is disconnected. It is best to use the reader to remove the fault codes.

Audi Fault Codes List (Deciphering)

Flashing code Reader Fault
4444 00000 No faults
0000 End of code transfer
1211 037 Battery
1212 052 Throttle End Sensor
(Idle position)
1111 65535 Internal malfunction BES
1231 00281 Speedometer sensor or chain
1232 00282 Throttle potentiometer
1232 00282 Step Motor Idle Control
(Alternate code)
2111 00513 Motor speed sensor or circuit
2112 00514 TDC Sensor or its chain
2112 00514 Crankshaft Angle Sensor
2113 00515 Hall sensor or chain
2114 00535 Ignition Distributor
2121 00516 Stepper Motor Control
Idle
2121 00516 Ignition Control valve Chain
(Alternate code)
2122 No rotation speed signal
Engine
2122 00517 Micro Switchь Extreme situation
Throttle
(Full load)
2141 00535 Control 1 on detonation (BES)
2142 00524 Detonation sensor 1 or its chain
2142 00545 No signal from automatic transmission
2143 00536 Control 2 on detonation (BES)
2144 00540 Detonation sensor 2 or its chain
2212 00518 Throttle potentiometer
or its chain
2214 00543 Engine exceeding Maximum
Speed
2222 00519 Absolute pressure sensor
In the Collector
2223 00528 Atmospheric pressure sensor or its chain
2224 00544 Exceeding the permissible pressure
Turbocharger
2231 00533 Idle control
2232 00520 Air flow sensor with damper or
His chain
2232 00520 A mass air flow sensor or
Its chain (alternative code)
2233 0531 Air flow sensor with damper or
His chain
2233 0531 A mass air flow sensor or
Its chain (alternative code)
2234 00532 Improper voltage on-board
Network
2242 00521 Potentiometer Adjustment with OR
Chain
2312 0522 Temperature sensor Cooling
Liquid or its chain
2314 00545 Violation of the electric connection of the engine with the transmission
2322 00523 Air temperature sensor or its chain
2323 00522 Air flow sensor with damper or its chain
2323 00522 Air mass flow sensor or its chain (alternative code)
2324 00553 Air flow sensor with damper or its chain
2224 00553 Air mass flow sensor or its chain (alternative code)
2341 00537 The oxygen sensor control does not work
2342 00525 Oxygen sensor or its chain
2343 00558 Setting up the control of the working mixture, poor
2344 00559 Adjustment of working mix control, rich
2413 00561 The mixture yields beyond the permissible boundaries
4332 00750 Bes
4343 01243 Carbon Filter Control Valve
4411 01244 Nozzle № 1 or its chain
4412 01247 Nozzle № 2 or its chain
4413 01249 Nozzle № 3 or its chain
4414 01250 Nozzle № 4 or its chain
4421 01251 Nozzle № 5 or its chain
4431 01253 Idle control valve or chain
4442 01254 Pressurized pressure control valve or its chain
00527 Inlet collector temperature
00530 Throttle potentiometer or chain
00532 Improper voltage on-board
Network
00543 Engine exceeding Maximum
Speed
00549 Flow signal
00545 Violation of the electric connection of the engine with the transmission
00554 Control 2 by Oxygen sensor
00555 Oxygen sensor or its chain
00560 Recirculation valve or chain
00561 Mix Management 1
00575 Absolute pressure sensor in collector
00577 № 1 Cylinder Detonation control
00578 № 2 Cylinder Detonation control
00579 № 3 Cylinder Detonation control
00580 Detonation Control cylinder № 4
00581 № 5 Cylinder Detonation control
00582 № 6 Cylinder Detonation control
00585 Temperature sensor for exhaust gases
Recycling Systems
00586 Recirculation valve or chain
00609 Ignition Amplifier 1 or its chain
00610 Ignition Amplifier 2 or its chain
00611 The ignition amplifier 3 or its chain
00624 Air conditioning
00625 Speedometer sensor
00635 Oxygen sensor heater or sensor circuit
00640 Oxygen sensor or its chain
00670 The potentiometer of the stepper motor of the idling regulator or its chain
00689 Extra Air Inlet Collector
00750 Light Fault Alarm
01025 Light Fault Alarm
01087 Basic installation not completed
01088 Mix composition Control 2
01119 Transmission number identification signal
01120 Phase Change Control Timing
01165 Throttle potentiometer or chain
01182 Adaptability to height above sea level
01235 Secondary air valve
01242 BES or chain
01247 Carbon filter control valve or chain
01252 № 4 Nozzle valve or valve control circuit
01257 Idle control valve or chain
01259 Relay of fuel pump or relay circuit
01262 Turbocharger pressure Control valve
01264 Secondary air Pump
01265 Recirculation valve or chain
16486 Low mass air flow sensor signal
16487 The signal of the mass air flow sensor above the norm
16496 Weak air temperature sensor signal
16497 Air temperature sensor signal above normal
16500 Coolant temperature sensor or circuit
16501 Low coolant temperature sensor signal
16502 Coolant temperature sensor signal above normal
16504 Throttle potentiometer or chain
16505 Implausible throttle potentiometer Signal
16506 Weak throttle potentiometer Signal
16507 Throttle potentiometer Signal above norm
16514 Oxygen sensor or its chain
16515 Oxygen sensor or its chain
16516 Oxygen sensor signal above normal
16518 Oxygen sensor or its chain
16519 Oxygen sensor and whether its chain
16534 Oxygen sensor or its chain
16535 Oxygen sensor or its chain
16536 Oxygen sensor signal above normal
16538 Oxygen sensor or its chain
16554 Nozzle Group 1
16555 Nozzle Group 1, poor mix
16556 Nozzle Group 1, Rich mix
16557 Nozzle Group 2
16558 Nozzle Group 2, poor mix
16559 Nozzle Group 2, Rich mix
16684 Ignition failures
16685 Ignition failures in the cylinder № 1
16686 Ignition failures in the cylinder № 2
16687 Ignition failures in the cylinder № 3
16688 Ignition failures in the cylinder № 4
16689 Ignition failures in the cylinder № 5
16690 Ignition failures in the cylinder № 6
16691 Ignition failures in the cylinder № 7
16692 Ignition failures in the cylinder № 8
16705 Engine speed sensor and whether its chain
16706 Motor speed sensor or circuit
16711 Low detonation sensor signal № 1
16716 Weak detonation sensor signal № 2
16721 The angle sensor of the crankshaft or its chain
16785 Exhaust Gases
16786 Exhaust Gases
16885 Speedometer sensor or chain
16989 Bes
17509 Oxygen sensor or its chain
17514 Oxygen sensor or its chain
17540 Oxygen sensor or its chain
17541 Oxygen sensor or its chain
17609 № 1 Nozzle needle or control circuit
17610 № 4 Nozzle needle or control circuit
17611 № 3 Nozzle needle or control circuit
17612 № 4 Nozzle needle or control circuit
17613 № 5 Nozzle needle or control circuit
17614 № 6 Nozzle needle or control circuit
17615 № 7 Nozzle needle or control circuit
17616 Needle Nozzle № 8 or control circuit
16721 № 1 Nozzle needle or control circuit
16722 № 2 Nozzle needle or control circuit
16723 № 3 Nozzle needle or control circuit
16724 № 4 Nozzle needle or control circuit
16725 № 5 Nozzle needle or control circuit
16726 № 6 Nozzle needle or control circuit
16727 Ignition failures in the cylinder № 7
16728 Ignition failures in the cylinder № 8
17733 Detonation control in the cylinder № 1
17734 Detonation control in the cylinder № 2
17735 Detonation control in the cylinder № 3
17736 Detonation control in the cylinder № 4
17737 Detonation control in the cylinder № 5
17738 Detonation control in the cylinder № 6
17739 Detonation control in the cylinder № 7
17740 Detonation control in the cylinder № 8
17747 The signals of speed and rotation angle of the crankshaft were swapped
17749 Channel 1 ignition is short on mass
17751 Channel 2 ignition is short on mass
17753 Channel 3 ignition is short on mass
17799 The turning sensor of the camshaft or its chain
17800 The turning sensor of the camshaft or its chain
17801 Channel 1 ignition
17802 Channel 2 ignition
17803 Channel 3 ignition
17808 Recirculation valve or chain
17810 Recirculation valve or chain
17815 Low recirculation valve control signal
17816 Recirculation valve control signal above norm
17817 Carbon Filter Control Valve
17818 Carbon Filter Control Valve
17908 Relay or fuel pump power supply circuit
17910 Relay or fuel pump power supply circuit
17912 System launches
17913 Micro Throttle position (idling)
17914 Micro Throttle position [Idle]
17915 Idle control valve or chain
17916 Idle control valve or chain
17917 Idle control valve or chain
17918 Idle control valve or chain
17919 Variable inlet manifold control valve or chain
17920 Variable inlet manifold control valve or chain
17966 Throttle Actuator
17978 Immobilizer
18008 Voltage of the on-board network
18010 Battery
18020 Bes
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