Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN2002GOLF GLS, 2.0 K, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 100 (2.8L - FUEL INJECTION IGNITION, ENGINE CODE(S): AFP (A4 PLATFORM))
2002 Volkswagen Golf GLS, 2.0 K, Standard
Section 100 (2.8L - Fuel Injection Ignition, Engine Code(S): AFP (A4 Platform))
2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Section 100 (2.8L - Fuel Injection Ignition, Engine Code(S): AFP (A4 Platform))
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Volkswagen Jetta, 2002 Volkswagen GTI, 2001 Volkswagen Jetta, 2001 Volkswagen GTI, and 2000 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- 01 On Board Diagnostic (OBD)
- On Board Diagnostic (OBD)
- On Board Diagnostic (OBD), features
- Malfunction Indicator Lamp (MIL), significance
- Malfunction Indicator Lamp (MIL) (through m.y. 1999), checking
- Malfunction Indicator Lamp (MIL) (from m.y. 2000), checking
- Electronic Power Control (EPC) warning lamp in instrument cluster (through m.y. 1999), significance
- Electronic Power Control (EPC) warning lamp in instrument cluster (from m.y. 2000), significance
- On Board Diagnostic (OBD), technical data
- Scan Tool (ST) VAG 1551 , connecting and selecting functions
- Vehicle diagnostic, testing and information system VAS 5051 , connecting and selecting engine control module
- Diagnostic Trouble Code (DTC) memory
- Diagnostic Trouble Code (DTC) table: SAE P0 codes
- Diagnostic Trouble Code (DTC) table: SAE P1 codes
- Output Diagnostic Test Mode (DTM) (scan tool function 03)
- Output Diagnostic Test Mode (DTM), activating
- Notes
- Requirements
- Work sequence
- Activating Evaporative Emissions (EVAP) canister purge regulator valve N80
- Activating Secondary Air Injection (AIR) solenoid valve N112
- Activating Secondary Air Injection (AIR) pump relay J299
- Activating Intake Manifold change-over valve N156
- Activating Leak Detection Pump (LDP) V144 :
- Output Diagnostic Test Mode (DTM), activating
- Readiness code
- Read Measuring Value Block (scan tool function 08)
- On Board Diagnostic (OBD)
- 24 Multiport Fuel Injection (MFI)
- Fuel injection system, servicing
- Component locations, overview
- Fuel injection and ignition, general information
- Fuel injection system components, removing and installing
- Intake manifold upper section, disassembling and assembling
- Intake manifold (lower section), disassembling and assembling
- Air cleaner, removing and installing
- Safety precautions
- Rules of cleanliness
- Technical data
- Fuel injection system components, checking
- Heated Oxygen Sensor (HO2S) G39 , checking
- Heated Oxygen Sensor (HO2S) after Three Way Catalytic Converter (TWC), checking
- Mass Air Flow (MAF) Sensor G70 , checking
- Throttle valve control module J338 , checking
- Engine Coolant Temperature (ECT) sensor, checking
- Intake air temperature sensor G42 , checking
- Engine speed (RPM) sensor G28 , checking
- Fuel injectors, checking
- Fuel pressure regulator and residual pressure, checking
- Intake Manifold change-over valve N156 , checking
- Intake air system, checking for leaks (unmetered air)
- Functions, checking
- Idle speed, checking
- Oxygen sensor and oxygen sensor control before Three Way Catalytic Converter (TWC), checking
- Notes
- Requirements
- Functional check
- Explanation of 3 digit number block in display field 1
- Continuation
- Evaluating display field 32, display field 1: Oxygen sensor learned values before Three Way Catalytic Converter (TWC)
- Possible causes of malfunction if oxygen sensor control frequency is too slow:
- Checking oxygen sensor wiring for oxygen sensor 1
- Oxygen sensor and oxygen sensor control after Three Way Catalytic Converter (TWC), checking
- Notes
- Requirements
- Functional check
- Explanation of 3 digit number block in display field 2
- Continuation
- Evaluating display group 36, display field 1 - Oxygen sensor voltage oxygen sensor after catalyst
- Possible causes of malfunction if O2S sensor control frequency is too slow:
- Checking basic voltage for oxygen sensor 2
- Checking oxygen sensor wiring, oxygen sensor 2
- Oxygen sensor 1 aging, checking
- Engine operating mode, checking
- Engine Control Module (ECM)
- Additional signals, checking
- CAN-Bus, checking
- Fuel injection system, servicing
- 28 Ignition/Glow plug system
- Ignition system, servicing
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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.