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HOMESERVICE MANUALSAUDI1999A4 BASE, 1.8 B, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICS - INTRODUCTIONDTC IDENTIFICATIONA4 2.8L DTC IDENTIFICATION

1999 Audi A4 Base, 1.8 B, Automatic

A4 2.8L DTC Identification

1999 Audi A4 Base, 1.8 B, AutomaticSECTION A4 2.8L DTC Identification

A4 2.8L DTC IDENTIFICATION

Generic Scan Tool Code

VAG 1551 Code

Malfunction/Affected Sensor Or Circuit

P0102⁽¹⁾

⁽¹⁾16486

MAF Circuit Low Input

P0103⁽¹⁾

⁽¹⁾16487

MAF Circuit High Input

P0112⁽¹⁾

⁽¹⁾16496

Intake Air Temperature Circuit Low Input

P0113⁽¹⁾

⁽¹⁾16497

Intake Air Temperature Circuit High Input

P0116⁽¹⁾

⁽¹⁾16500

ECT Circuit Range/Performance Problem

P0117⁽¹⁾

⁽¹⁾16501

ECT Circuit Low Input

P0118⁽¹⁾

⁽¹⁾16502

ECT Circuit High Input

P0121⁽¹⁾

⁽¹⁾16505

TP Sensor Circuit Range/Performance Problem

P0122⁽¹⁾

⁽¹⁾16506

TP Sensor Circuit Low Input

P0123⁽¹⁾

⁽¹⁾16507

TP Sensor Circuit High Input

P0130⁽¹⁾

⁽¹⁾16514

HO2S Circuit Malfunction (Bank 1, Sensor 1)

P0131⁽¹⁾

⁽¹⁾16515

HO2S Circuit Low Voltage (Bank 1, Sensor 1)

P0132⁽¹⁾

⁽¹⁾16516

HO2S Circuit High Voltage (Bank 1, Sensor 1)

P0133⁽¹⁾

⁽¹⁾16517

HO2S Circuit Slow Response (Bank 1, Sensor 1)

P0134⁽¹⁾

⁽¹⁾16518

HO2S Circuit No Activity Detected (Bank 1, Sensor 1)

P0136⁽¹⁾

⁽¹⁾16520

HO2S Circuit Malfunction (Bank 1, Sensor 2)

P0137⁽¹⁾

⁽¹⁾16521

HO2S Circuit Low Voltage (Bank 1, Sensor 2)

P0138⁽¹⁾

⁽¹⁾16522

HO2S Circuit High Voltage (Bank 1, Sensor 2)

P0140⁽¹⁾

⁽¹⁾16524

HO2S Circuit No Activity Detected (Bank 1, Sensor 2)

P0150⁽¹⁾

⁽¹⁾16534

HO2S Circuit Malfunction (Bank 2, Sensor 1)

P0151⁽¹⁾

⁽¹⁾16535

HO2S Circuit Low Voltage (Bank 2, Sensor 1)

P0152⁽¹⁾

⁽¹⁾16536

HO2S Circuit High Voltage (Bank 2, Sensor 1)

P0153⁽¹⁾

⁽¹⁾16537

HO2S Circuit Slow Response (Bank 2, Sensor 1)

P0154⁽¹⁾

⁽¹⁾16538

HO2S Circuit No Activity Detected (Bank 2, Sensor 1)

P0156⁽¹⁾

⁽¹⁾16540

HO2S Circuit Malfunction (Bank 2, Sensor 2)

P0157⁽¹⁾

⁽¹⁾16541

HO2S Circuit Low Voltage (Bank 2, Sensor 2)

P0158⁽¹⁾

⁽¹⁾16542

HO2S Circuit High Voltage (Bank 2, Sensor 2)

P0160⁽¹⁾

⁽¹⁾16544

HO2S Circuit No Activity Detected (Bank 2, Sensor 2)

P0300⁽²⁾

⁽²⁾16684

Random/Multiple Misfire Detected

P0301⁽²⁾

⁽²⁾16685

Cylinder No. 1 Misfire Detected

P0302⁽²⁾

⁽²⁾16686

Cylinder No. 2 Misfire Detected

P0303⁽²⁾

⁽²⁾16687

Cylinder No. 3 Misfire Detected

P0304⁽²⁾

⁽²⁾16688

Cylinder No. 4 Misfire Detected

P0305⁽²⁾

⁽²⁾16689

Cylinder No. 5 Misfire Detected

P0306⁽²⁾

⁽²⁾16690

Cylinder No. 6 Misfire Detected

P0321⁽¹⁾

⁽¹⁾16705

Ignition Engine Speed Input Circuit Range/Performance

P0322⁽³⁾

⁽³⁾16706

Ignition Engine Speed Input Circuit No Signal

P0327⁽³⁾

⁽³⁾16711

Knock Sensor No. 1 Circuit Low Input

P0328⁽³⁾

⁽³⁾16712

Knock Sensor No. 1 Circuit High Input

P0332⁽³⁾

⁽³⁾16716

Knock Sensor No. 2 Circuit Low Input

P0333⁽³⁾

⁽³⁾16717

Knock Sensor No. 2 Circuit High Input

P0411⁽¹⁾

⁽¹⁾16795

Secondary Air Injection System Incorrect Flow Detected

P0422⁽¹⁾

⁽¹⁾16806

Main Catalyst Efficiency Below Threshold (Bank 1)

P0432⁽¹⁾

⁽¹⁾16816

Main Catalyst Efficiency Below Threshold (Bank 2)

P0441⁽⁴⁾

⁽⁴⁾16825

EVAP Emission Control System Incorrect Purge Flow

P0442⁽⁴⁾

⁽⁴⁾16826

EVAP Emission Control System Small Leak Detected

P0455⁽⁴⁾

⁽⁴⁾16839

EVAP Emission Control System Gross Leak Detected

P0501⁽¹⁾

⁽¹⁾16885

Vehicle Speed Sensor Range/Performance

P0506⁽¹⁾

⁽¹⁾16890

Idle Control System RPM Lower Than Expected

P0507⁽¹⁾

⁽¹⁾16891

Idle Control System RPM Higher Than Expected

P0601⁽¹⁾

⁽¹⁾16985

Internal Controller Module Memory Check Sum Error

P0604⁽¹⁾

⁽¹⁾16988

Internal Controller Module Memory RAM Error

P1102⁽¹⁾

⁽¹⁾17510

HO2S Heater Circuit Short to B+ (Bank 1, Sensor 1)

P1105⁽¹⁾

⁽¹⁾17513

HO2S Heater Circuit Short to B+ (Bank 1, Sensor 2)

P1107⁽¹⁾

⁽¹⁾17515

HO2S Heater Circuit Short To B+ (Bank 2, Sensor 1)

P1110⁽¹⁾

⁽¹⁾17518

HO2S Heater Circuit Short To B+ (Bank 2, Sensor 2)

P1127⁽¹⁾

⁽¹⁾17535

Long Term Fuel Trim Multiplicative Too Rich (Bank 1)

P1128⁽¹⁾

⁽¹⁾17536

Long Term Fuel Trim Multiplicative Too Lean (Bank 1)

P1129⁽¹⁾

⁽¹⁾17537

Long Term Fuel Trim Multiplicative Too Rich (Bank 2)

P1130⁽¹⁾

⁽¹⁾17538

Long Term Fuel Trim Multiplicative Too Lean (Bank 2)

P1136⁽¹⁾

⁽¹⁾17544

Long Term Fuel Trim Additive Too Lean (Bank 1)

P1137⁽¹⁾

⁽¹⁾17545

Long Term Fuel Trim Additive Too Rich (Bank 1)

P1138⁽¹⁾

⁽¹⁾17546

Long Term Fuel Trim Additive Too Lean (Bank 2)

P1139⁽¹⁾

⁽¹⁾17547

Long Term Fuel Trim Additive Too Rich (Bank 2)

P1141⁽¹⁾

⁽¹⁾17549

Load Calculation Cross Check Range/Performance

P1176⁽⁴⁾

⁽⁴⁾17584

O2 Correction Behind Catalyst B1 Limit Attained

P1177⁽⁴⁾

⁽⁴⁾17585

O2 Correction Behind Catalyst B2 Limit Attained

P1196⁽¹⁾

⁽¹⁾17604

O2 Sensor Heater Circuit Electrical Malfunction (Bank 1, Sensor 1)

P1197⁽¹⁾

⁽¹⁾17605

O2 Sensor Heater Circuit Electrical Malfunction (Bank 2, Sensor 1)

P1198⁽¹⁾

⁽¹⁾17606

O2 Sensor Heater Circuit Electrical Malfunction (Bank 1, Sensor 2)

P1199⁽¹⁾

⁽¹⁾17607

O2 Sensor Heater Circuit Electrical Malfunction (Bank 2, Sensor 2)

P1213⁽³⁾

⁽³⁾17621

Cylinder No. 1 Fuel Injector Circuit Short To B+

P1214⁽³⁾

⁽³⁾17622

Cylinder No. 2 Fuel Injector Circuit Short To B+

P1215⁽³⁾

⁽³⁾17623

Cylinder No. 3 Fuel Injector Circuit Short To B+

P1216⁽³⁾

⁽³⁾17624

Cylinder No. 4 Fuel Injector Circuit Short To B+

P1217⁽³⁾

⁽³⁾17625

Cylinder No. 5 Fuel Injector Circuit Short To B+

P1218⁽³⁾

⁽³⁾17626

Cylinder No. 6 Fuel Injector Circuit Short To B+

P1225⁽³⁾

⁽³⁾17633

Cylinder No. 1 Fuel Injector Circuit Short To Ground

P1226⁽³⁾

⁽³⁾17634

Cylinder No. 2 Fuel Injector Circuit Short To Ground

P1227⁽³⁾

⁽³⁾17635

Cylinder No. 3 Fuel Injector Circuit Short To Ground

P1228⁽³⁾

⁽³⁾17636

Cylinder No. 4 Fuel Injector Circuit Short To Ground

P1229⁽³⁾

⁽³⁾17637

Cylinder No. 5 Fuel Injector Circuit Short To Ground

P1230⁽³⁾

⁽³⁾17638

Cylinder No. 6 Fuel Injector Circuit Short To Ground

P1237⁽³⁾

⁽³⁾17645

Cylinder No. 1 Fuel Injector Open Circuit

P1238⁽³⁾

⁽³⁾17646

Cylinder No. 2 Fuel Injector Open Circuit

P1239⁽³⁾

⁽³⁾17647

Cylinder No. 3 Fuel Injector Open Circuit

P1240⁽³⁾

⁽³⁾17648

Cylinder No. 4 Fuel Injector Open Circuit

P1241⁽³⁾

⁽³⁾17649

Cylinder No. 5 Fuel Injector Open Circuit

P1242⁽³⁾

⁽³⁾17650

Cylinder No. 6 Fuel Injector Open Circuit

P1250⁽⁴⁾

⁽⁴⁾17658

Fuel Level Too Low

P1325⁽⁴⁾

⁽⁴⁾17733

Cylinder No. 1 Knock Control Limit Attained

P1326⁽⁴⁾

⁽⁴⁾17734

Cylinder No. 2 Knock Control Limit Attained

P1327⁽⁴⁾

⁽⁴⁾17735

Cylinder No. 3 Knock Control Limit Attained

P1328⁽⁴⁾

⁽⁴⁾17736

Cylinder No. 4 Knock Control Limit Attained

P1329⁽⁴⁾

⁽⁴⁾17737

Cylinder No. 5 Knock Control Limit Attained

P1330⁽⁴⁾

⁽⁴⁾17738

Cylinder No. 6 Knock Control Limit Attained

P1337⁽¹⁾

⁽¹⁾17745

Camshaft Position Sensor Short To Ground (Bank 1)

P1338⁽¹⁾

⁽¹⁾17746

Camshaft Position Sensor Open Circuit Or Short To B+ (Bank 1)

P1386⁽¹⁾

⁽¹⁾17794

Internal Control Module Knock Control Circuit Error

P1391⁽¹⁾

⁽¹⁾17799

Camshaft Position (CMP) Sensor Short To Ground (Bank 2)

P1392⁽¹⁾

⁽¹⁾17800

Camshaft Position (CMP) Sensor Open Circuit Or Short To B+ (Bank 2)

P1410⁽¹⁾

⁽¹⁾17818

Fuel Tank Ventilation Valve Circuit Short To B+

P1421⁽³⁾

⁽³⁾17829

Secondary Air Injection Valve Circuit Short To Ground

P1422⁽³⁾

⁽³⁾17830

Secondary Air Injection System Control Valve Circuit Short To B+

P1425⁽¹⁾

⁽¹⁾17833

Tank Vent Valve Short To Ground

P1426⁽¹⁾

⁽¹⁾17834

Tank Vent Valve Open

P1432⁽¹⁾

⁽¹⁾17840

Secondary Air Injection Valve Open

P1433⁽¹⁾

⁽¹⁾17841

Secondary Air Injection System Pump Relay Circuit Open

P1434⁽¹⁾

⁽¹⁾17842

Secondary Air Injection System Pump Relay Circuit Short To B+

P1435⁽¹⁾

⁽¹⁾17843

Secondary Air Injection System Pump Relay Circuit Short To Ground

P1436⁽¹⁾

⁽¹⁾17844

Secondary Air Injection System Pump Relay Circuit Electrical Malfunction

P1471⁽⁴⁾

⁽⁴⁾17879

EVAP Emission Control LDP Circuit Short To B+

P1472⁽⁴⁾

⁽⁴⁾17880

EVAP Emission Control LDP Circuit Short To Ground

P1473⁽⁴⁾

⁽⁴⁾17881

EVAP Emission Control LDP Open Circuit

P1476⁽⁴⁾

⁽⁴⁾17884

EVAP Emission Control LDP Circuit Malfunction/Insufficient Vacuum

P1477⁽⁴⁾

⁽⁴⁾17885

EVAP Emission Control LDP Circuit Malfunction

P1500⁽³⁾

⁽³⁾17908

Fuel Pump Relay Circuit Electrical Malfunction

P1501⁽³⁾

⁽³⁾17909

Fuel Pump Relay Circuit Short To Ground

P1502⁽³⁾

⁽³⁾17910

Fuel Pump Relay Circuit Short To B+

P1505⁽¹⁾

⁽¹⁾17913

CTP Switch Does Not Close (Open Circuit)

P1512⁽³⁾

⁽³⁾17920

Intake Manifold Change-Over Valve Circuit Short To B+

P1515⁽³⁾

⁽³⁾17923

Intake Manifold Change-Over Valve Circuit Short To Ground

P1516⁽³⁾

⁽³⁾17924

Intake Manifold Change-Over Valve Circuit Open

P1519⁽¹⁾

⁽¹⁾17927

Intake Camshaft Control Malfunction (Bank 1)

P1522⁽¹⁾

⁽¹⁾17930

Intake Camshaft Control Malfunction (Bank 2)

P1543⁽¹⁾

⁽¹⁾17951

Throttle Actuation Potentiometer Signal Too Low

P1544⁽¹⁾

⁽¹⁾17952

Throttle Actuation Potentiometer Signal Too High

P1545⁽¹⁾

⁽¹⁾17953

Throttle Position Control Malfunction

P1558⁽¹⁾

⁽¹⁾17966

Throttle Actuator Electrical Malfunction

P1559⁽⁴⁾

⁽⁴⁾17967

Idle Speed Control Throttle Position Adaptation Malfunction

P1560⁽⁴⁾

⁽⁴⁾17968

Maximum Engine Speed Exceeded

P1564⁽⁴⁾

⁽⁴⁾17972

Idle Speed Control Throttle Position Low Voltage During Adaptation

P1565⁽¹⁾

⁽¹⁾17973

Idle Speed Control Throttle Position Lower Impact Not Attained

P1600⁽³⁾

⁽³⁾18008

Power Supply (B+) Terminal 15 Low Voltage

P1602⁽⁴⁾

⁽⁴⁾18010

Power Supply (B+) Terminal 30 Low Voltage

P1606⁽⁴⁾

⁽⁴⁾18014

Rough Road/Acceleration Specification Engine Torque ABS-PCM Electrical Malfunction

P1612⁽³⁾

⁽³⁾18020

PCM Incorrectly Coded (Vehicle With A/T Is Coded For M/T)

P1612⁽⁴⁾

⁽⁴⁾18020

PCM Incorrectly Coded (Vehicle With ASR Is Not Coded For ASR)

P1624⁽³⁾

⁽³⁾18032

MIL Request Signal Active

P1626⁽¹⁾

⁽¹⁾18034

CAN Bus Missing Message From Transmission Controller

P1640⁽¹⁾

⁽¹⁾18048

Internal Controller Module (EEPROM) Error

P1681⁽³⁾

⁽³⁾18089

Controller Unit Programming Not Finished

P1690⁽⁴⁾

⁽⁴⁾18098

MIL Malfunction

⁽¹⁾	MIL is switched on after 2 trips.

⁽²⁾	MIL is switched on after 2 trips or will blink.

⁽³⁾	MIL is switched on immediately.

⁽⁴⁾	MIL is not switched on.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.