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Audi 20V Turbo 5 cylinder ECU Fault Codes

  • 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
  • 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
    Fault code can occur after cranking the engine during a no start condition
  • 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