20V Turbo ECU Fault Code Listing

NOTE: The fault codes shown below [2] [3] are referenced from the Robert Bentley Repair Manuals.

Of course you should own the Bentley manual for your Audi if you want to save thousands of $$ and want to have any hope of repairing your Audi.

If you want others to view these fault codes, please convince them to purchase the Robert Bentley Manual, or provide a link to our website.

The fault codes indicate that the ECU has recorded a problem with one or more of the following: A system component, the wiring, the wiring connections, or from a engine mechanical problem (vacuum leak, low compression, etc.).

If you get multiple fault codes recorded, step through the fault code reading sequence and write down all the fault codes that were recorded. After you locate the source of the problem for the "first" fault code you read, you may want to then clear all the fault codes stored and drive the car again to see if the other fault codes are stored again.

In some cases multiple fault codes are recorded even though there may be only one problem with the system.

Ground wiring problems may cause multiple faults, check the ECU wiring harness ground wires on the engine, and the main engine ground cable.

Check Engine Light Blink Code Fault Number, VAG1551/1552 Scan tool Fault Code Number
Source of Fault code
Possible cause
Recommended Check or Repair Symptom in some cases

1111 (Blink Fault Code), 65535 VAG1551/2 Fault Code Number
Engine Control Unit (ECU) Defective memory circuits,
Incorrect Checksum for internal memory (EPROMs)
(this can occur on some modified ECU's) Check ECU ground connections, Check EPROM programming
Symptom: Check engine light may come on
1231 (Blink Fault Code), 00281 VAG1551/2 Fault Code Number (S4/S6 with AAN engine Only)
Vehicle Speed Sensor (G68),
Open circuit or short circuit, speed sensor malfunctioning
Symptom: A/C compressor does not shut off during wide open throttle in 1st gear
2111 (Blink Fault Code), 00513 VAG1551/2 Fault Code Number
RPM sensor (G28)
Open or short circuit, sensor malfunction
Defective sensor & cables, metal fragments on flywheel teeth
Symptom: Engine will not start, misfires, may stop running
NOTE: I have seen this fault code occur after cranking the engine during a no start condition
in a few rare cases where there was nothing wrong with the RPM sensor
2112 (Blink Fault Code), 00514 VAG1551/2 Fault Code Number
Timing reference sensor, (G4) (located 62 degrees BTDC)
Sensor malfunction, Flywheel pin damaged/missing, Mis-located Sensor,
distance to flywheel pin greater than 1.2mm (3/64 inch), wiring shielding problem for G4,
hall sensor out of adjustment (3B and early AAN engines only)
Symptom: Engine will not start, possible low power
NOTE: I have seen this fault code occur after cranking the engine during a no start condition
in a few rare cases where there was nothing wrong with the Reference sensor or flywheel pin
2113 (Blink Fault Code), 00515 VAG1551/2 Fault Code Number
(G40) Hall sensor in distributor
(3B, early AAN engines) or camshaft position Hall Effect sensor later S4/S6 AAN engine).
Distributor alignment, faulty sender, Mis-located sensor & distributor, Cam timing possibly incorrect on AAN engine, Check lower Crankshaft Gear keyway
Symptom: Engine will not start, power loss, check engine light may come on during driving above certain RPM
2121 (Blink Fault Code), 00516 VAG1551/2 Fault Code Number
Idle switch problem
Switch open circuit, stuck closed Switch defective (Internal solder connections intermittent) or wiring problem
2141 (Blink Fault Code), 00535 VAG1551/2 Fault Code Number
Knock regulator #1
Excessive knock, timing is being retarded by maximum amount,
Symptom: Low boost on 20V, Fuel octane too low, Excessive Compression, excessive boost
2142 (Blink Fault Code), 00524 VAG1551/2 Fault Code Number
Knock sensor #1 (G61)
Open or short circuit, Defective sensor Check sensor and wiring
Symptom: Timing retarded, High fuel consumption, power loss, Boost pressure not attained
2143 (Blink Fault Code),00536 VAG1551/2 Fault Code Number
Knock sensor #2, (Cylinders 3, 4, 5)
Excessive knock, timing is being retarded by maximum amount.
Symptom: Fuel octane too low, Excessive Compression, excessive boost
2144 (Blink Fault Code), 00540 VAG1551/2 Fault Code Number
Knock Sensor #2, (G66) (Cylinders 3, 4, 5)
Open or short circuit, Defective sensor or wiring
Symptom: Timing retarded, High fuel consumption, power loss, Boost pressure not attained
2212 (Blink Fault Code), 00518 VAG1551/2 Fault Code Number
Throttle potentiometer,
short circuit to + or to ground,moisture or corrosion in harness connector
Check throttle potentiometer resistance from idle to full throttle.
Symptom: Lack of power or boost pressure is not attained
2214 (Blink Fault Code), 00543 VAG1551/2 Fault Code Number
Engine Over-revved
Engine has exceeded rev limit 7440 RPM on 20V engine) Driver has heavy right foot.
2221 (Blink Fault Code), 00575 VAG1551/2 Fault Code Number for 3B 20V Turbo engine ONLY
Manifold Pressure too low, or too high, control difference.
Vacuum hose to ECU pressure sensor Vacuum hose missing or leaking, Check hose
Symptom: Loss of Power
2222 (Blink Fault Code), 00519 VAG1551/2 Fault Code Number
ECU Internal Pressure sensor (G71)
Pressure sensor defective,
Repair or replace ECU or replace internal pressure sensor
2223 (Blink Fault Code), 00528 VAG1551/2 Fault Code Number
Altitude Sensor (F96)
Break in wiring or short to + or ground Symptom:
Symptom: Loss of power, boost pressure is not attainable
2224 (Blink Fault Code), 00544 VAG1551/2 Fault Code Number
Maximum Charge Pressure Exceeded,
Intake air leak after turbocharger, ECU Vacuum/pressure line has leak between intake manifold
Waste gate or pressure hose, Waste Gate Solenoid/hose problem, ECU pressure sensor malfunction
Symptom: Misfire during wide open throttle, boost pressure too high
2231 (Blink Fault Code), 00533 VAG1551/2 Fault Code Number
Idle Speed Control Valve (N71)
Idle speed adaptation maximum limit exceeded or Minimum adaptation limit not reached
Sticky or binding ISV, Mass Air Flow Meter (G70) offset, additional air introduced between G70 and N71
Symptom: Idle speed too low, or too high, Add air leak.
2234 (Blink Fault Code), 00532 VAG1551/2 Fault Code Number
Supply Voltage Problem, ECU (J220) supply voltage too low or too high
Poor ECU ground connection at intake manifold, battery discharged, check battery current drain with engine off
2241 (Blink Fault Code), 00538 VAG1551/2 Fault Code Number (3B 20V Turbo Engine Only)
Second Knock Sensor, (G61)
Excessive knock, maximum control limit exceeded,
open circuit in signal wire from G28 engine speed sensor or G4 ignition timing sensor or G28 and G4 are reverse connected to ECU (J220), Fuel Octane too low, Abnormal Engine noises, Open circuit in knock sensor shielding (G61)
Symptom: low boost, Moderate power loss, higher fuel consumption, top speed not attainable
2312 (Blink Fault Code), 00522 VAG1551/2 Fault Code Number
Coolant sensor (G62)
Open or short circuit, Defective sensor or wiring, high resistance between sensor G62 and ECU J220
Symptom: Cold starting difficulties at low temperatures, Poor idle and acceleration during warm up
2322 (Blink Fault Code), 00523 VAG1551/2 Fault Code Number
Inlet air temp sensor (G42)
Open or short circuit, Defective sensor or wiring
Symptom: Slight power loss, Increase in fuel consumption
2324 (Blink Fault Code), 00553 VAG1551/2 Fault Code Number
Mass Air Flow (MAF) Sensor (G70)
Open or short circuit, defective sensor, Signal too low or too high, Open circuit between G70 and ECU J220, Voltage supply interrupted or short to ground
Symptom: system in limp home mode, very poor performance and acceleration, difficult to accelerate
2341 (Blink Fault Code), 00537 VAG1551/2 Fault Code Number
Oxygen Sensor Control Limit exceeded,
fuel pressure too low or too high, intake or exhaust leak, defective ignition system component, intake air leak after air mass sensor, O2 sensor is faulty
Symptom: CO before catalyst is below 0.3% or greater than 1.0%, Extremely lean or overly rich exhaust, Spark Plug fouling
2342 (Blink Fault Code), 00525 VAG1551/2 Fault Code Number
Oxygen Sensor (G39)
Sensor Wiring or Sensor defective Heat resistor in sensor defective, Signal wiring shorted to ground, Fuel tank empty, Ignition system component failure, air leak at mass air flow sensor, air leak in exhaust pipe before catalyst, poor ECU ground wire connection at intake manifold.
Symptom: Emissions not within specifications, increased fuel consumption, rich exhaust, spark plug fouling,
Carbon Monoxide (CO) percentage above 3%,
2413 (Blink Fault Code), 00561 VAG1551/2 Fault Code Number
Mixture Adjustment,
Adaptation limit exceeded, Adaptation limit not reached, Leakage in exhaust system before 3 Way catalytic converters, Incorrect signal for Mass Air Flow Sensor, Spark plugs, ignition coil(s), or Ignition Coil Power output stage malfunctioning
Symptom: Rich mixture, increased fuel consumption
3424 (Blink Fault Code), 00824 VAG1551/2 Fault Code Number (3B 20V Turbo Engine Only)
Fault Lamp Trigger Defective, short to + or to ground
Symptom: "Check" engine light on dash does not light up with ignition on
4343 (Blink Fault Code), 01247 VAG1551/2 Fault Code Number
Carbon Canister Solenoid, Evaporative Canister Purge Valve (N80),
Open or short circuit, +12V supply circuit breaker or fuse open?
Symptom: Poor response in part of load range, fuel odors, idle speed or quality may be affected
4411 (Blink Fault Code), 01249 VAG1551/2 Fault Code Number
Fuel Injector for Cylinder 1, (N30)
Open or short circuit, +12V supply circuit breaker or fuse open
Symptom: Engine runs rough or stalls
4412, (Blink Fault Code) 01250 VAG1551/2 Fault Code Number
Fuel Injector for Cylinder 2, (N31)
Open or short circuit, +12V supply circuit breaker or fuse open
Symptom: Engine runs rough or stalls
4413, (Blink Fault Code) 01251 VAG1551/2 Fault Code Number
Fuel Injector for Cylinder 3, (N32)
Open or short circuit, +12V supply circuit breaker or fuse open
Symptom: Engine runs rough or stalls
4414, (Blink Fault Code) 01252 VAG1551/2 Fault Code Number
Fuel Injector for Cylinder 4, (N33)
Open or short circuit, +12V supply circuit breaker or fuse open
Symptom: Engine runs rough or stalls
4421, (Blink Fault Code) 01253 VAG1551/2 Fault Code Number
Fuel Injector for Cylinder 5,
Open or short circuit, +12V supply circuit breaker or fuse open
Symptom: Engine runs rough or stalls
4431, (Blink Fault Code) 01257 VAG1551/2 Fault Code Number
Idle Stabilizer Valve solenoid, (N71)
Open or short circuit, check circuit breaker or fuse for +12V supply
Symptom: Engine speed out of range, Engine might die when cold, Engine runs rough or has flat spot,
Note: When in limp home Mode, idle speed is between 1100 and 1200 RPM
4442, (Blink Fault Code) 01262 VAG1551/2 Fault Code Number
Waste Gate Frequency Valve, (N75)
Open or short circuit, sticking valve, malfunctioning valve
Symptom: Boost pressure too high or too low, Severe misfiring during full throttle due to high boost
4444, (Blink Fault Code) 00000 VAG1551/2 Fault Code Number
No Faults have been recorded.
0000, (Blink Fault Code) 00000 VAG1551/2 Fault Code Number
End of Diagnostic Output

References: [2] Audi 100, 200 Official Factory Repair Manual Volume 1,
[3] Audi 100, A6 Official Factory Repair Manual, Robert Bentley Corporation

Copyright © SJM Autotechnik™ , all rights reserved

Return to Troubleshooting Tips page.

Return to SJM Autotechnik™ main page.

About Us Privacy Policy Terms of Use Links Customer Service Safety Information Home