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 MANUALSVOLKSWAGEN2003GOLF (1J1) L4-1.8L TURBO (AWW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)LOCATIONS
2003 Volkswagen Golf (1J1) L4-1.8L Turbo (AWW)
Coolant Temperature Sensor/Switch (For Computer): Locations
2003 Volkswagen Golf (1J1) L4-1.8L Turbo (AWW)SECTION Locations
Component Locations, Overview:
1 - EVAP canister purge regulator valve (N80)
- Evaporative Emission (EVAP) system
2 - Camshaft position (CMP) sensor (G40)
3 - Ignition coil with output stage (N70, N127, N291, N292)
4 - Engine control module
- (Motronic control module - J220)
5 - Wastegate bypass regulator valve (N75)
- Charge pressure system:
6 - Mass Air Flow (MAF) sensor (G70)
7 - Secondary air pump relay (J299)
- Secondary air system:
8 - Heated Oxygen Sensor (HO2S) (G39), 50 Nm
- Location: in catalyst, front
9 - 6-pin connector
- Black
- Contacts gold plated
- For Heated Oxygen Sensor (HO2S) (G39) and oxygen sensor heater (Z19)
- Left on underside of vehicle
10 - Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) (G130), 50 Nm
- Location: Behind catalyst
11 - 4-pin connector
- Black
- Contacts 3 and 4 gold-plated
- For Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) (G130) and oxygen sensor heating (Z29)
- Left on underside of vehicle
12 - Clutch pedal switch (F36), brake light switch (F) and brake pedal switch
13 - Air cleaner
14 - Protective housing
- For additional protection
15 - Engine Coolant Temperature (ECT) sensor (G62)
16 - Camshaft - adjustment valve (N208)*
17 - Fuel pressure regulator
18 - 10 Nm
19 - Engine speed sensor (G28)
20 - O-ring
21 - 20 Nm
- Tightening torque influences the function of the knock sensor
22 - Knock sensor 2 (G66)
- Black, 2-pin,
23 - 2 pin connector
- For knock sensor 2 (G66)
- Black
- Mark connector before removing
24 - Recirculating - valve for turbocharger (N249)
- Checking charge pressure system
25 - Secondary air injection solenoid valve (N112)
- Secondary air system
26 - Secondary air injection pump motor (V101)
- Secondary air system:
27 - Knock sensor 1 (G61)
- Black, 2-pin
28 - 2 pin connector
- For knock sensor 1 (G61)
- Black
- Mark connector before removing
29 - Injector (N30 to N33)
30 - Intake Air - Temperature (IAT) sensor (G42)
31 - Power steering pressure switch (F88)
32 - Throttle valve control module (J338)
33 - Charge air pressure sensor (G31)
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.