| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| T2ab | 2-pin connector, grey, in engine compartment, right |
| T10 | 10-pin connector, brown, connector point, electronics box, plenum chamber |
| T10m | 10-pin connector, black, connector point, electronics box, plenum chamber |
| 11 | Earth point, in battery box |
| A17 | Connection (61), in dash panel wiring harness |
| A86 | Positive (+) connection (50a), in dash panel wiring harness |
| J17 | Fuel pump relay |
| J220 | Motronic control unit |
| N8 | By-pass air cut-off valve (central idling) |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| N75 | Charge pressure control solenoid valve |
| N80 | Activated charcoal filter system solenoid valve 1 |
| N83 | Injector, cylinder 5 |
| N84 | Injector, cylinder 6 |
| S228 | Fuse in fuse box |
| S229 | Fuse in fuse box |
| S234 | Fuse in fuse box |
| T10 | 10-pin connector, brown, connector point, electronics box, plenum chamber |
| T10m | 10-pin connector, black, connector point, electronics box, plenum chamber |
| T10ar | 10-pin connector, orange, connector point, electronics box, plenum chamber |
| T15m | 15-pin connector, red, connector point, electronics box, plenum chamber |
| A151 | Connection -4- (87), in dash panel wiring harness |
| A152 | Connection -5- (87), in dash panel wiring harness |
| D22 | Positive (+) connection (87a for injectors), in engine compartment wiring harness, right |
| D23 | Positive (+) connection (87F), in engine compartment wiring harness, right |
| * | S 228 on RS4 25A! |
| G70 | Air mass meter |
| G235 | Exhaust gas temperature sender -1- |
| G236 | Exhaust gas temperature sender -2- |
| J220 | Motronic control unit |
| N205 | Inlet camshaft timing adjustment valve -1- |
| N208 | Inlet camshaft timing adjustment valve -2- |
| N335 | Variable intake manifold change-over valve |
| T10 | 10-pin connector, brown, connector point, electronics box, plenum chamber |
| T10m | 10-pin connector, black, connector point, electronics box, plenum chamber |
| T10ar | 10-pin connector, orange, connector point, electronics box, plenum chamber |
| 200 | Earth connection (screening), in engine compartment wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A45 | Connection (engine speed signal), in dash panel wiring harness |
| D8 | Connection (temperature sensor/potentiometer) in front right wiring harness |
| D23 | Positive (+) connection (87F), in engine compartment wiring harness, right |
| D101 | Connection -1-, in engine compartment wiring harness |
| E3 | Hazard warning light switch |
| G39 | Lambda probe I |
| G108 | Lambda probe II |
| J220 | Motronic control unit |
| J338 | Throttle valve control unit |
| T3au | 3-pin connector, red, connector point, electronics box, plenum chamber |
| T4y | 4-pin connector, black, in engine compartment, right |
| T4z | 4-pin connector, black, in engine compartment, left |
| T10ar | 10-pin connector, orange, connector point, electronics box, plenum chamber |
| Z19 | Lambda probe heater 1 |
| Z28 | Lambda probe 2 heater |
| 83 | Earth connection -1-, in front right wiring harness |
| 200 | Earth connection (screening), in engine compartment wiring harness |
| A79 | Connection (hot light switch), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| * | Applicable from model year 2000 |
| E45 | Cruise control system switch |
| G2 | Coolant temperature sender |
| G42 | Intake air temperature sender |
| G61 | Knock sensor I |
| G62 | Coolant temperature sender |
| G66 | Knock sensor II |
| J220 | Motronic control unit |
| T2af | 2-pin connector, black, in engine compartment, right |
| T3n | 3-pin connector, blue, in engine compartment, left |
| T3o | 3-pin connector, green, in engine compartment, left |
| T6y | 6-pin connector, black, next to steering column |
| T10 | 10-pin connector, brown, connector point, electronics box, plenum chamber |
| T10m | 10-pin connector, black, connector point, electronics box, plenum chamber |
| T15 | 15-pin connector, white, connector point, electronics box, plenum chamber |
| 104 | Earth connection, in front right wiring harness - sensor earth - |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 199 | Earth connection -3-, in dash panel wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| * | Only models with cruise control system |
| ** | Only models with air conditioner |
| E87 | Control and display unit for air conditioner |
| G28 | Engine speed sender |
| G31 | Charge air pressure sender |
| G40 | Hall sender 1 |
| G79 | Accelerator pedal position sender |
| G163 | Hall sender 2 |
| G185 | Accelerator pedal position sender -2- |
| J220 | Motronic control unit |
| T3m | 3-pin connector, grey, in engine compartment, left |
| T6as | 6-pin connector, black, in engine compartment, rear |
| T15 | 15-pin connector, white, connector point, electronics box, plenum chamber |
| T15m | 15-pin connector, red, connector point, electronics box, plenum chamber |
| 220 | Earth connection (sender earth), in engine wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| D141 | Connection (5V), in engine prewiring wiring harness |
| * | Only models with air conditioner |
| • | CAN bus (data wire) |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| J220 | Motronic control unit |
| M9 | Brake light bulb, left |
| M10 | Brake light bulb, right |
| N | Ignition coil 1 |
| N122 | Final output stage 1 |
| N128 | Ignition coil 2 |
| N158 | Ignition coil 3 |
| P | Spark plug connector |
| Q | Spark plugs |
| T3w | 3-pin connector, black, at output stage |
| T4f | 4-pin connector, black, on ignition final output stage |
| T15 | 15-pin connector, white, connector point, electronics box, plenum chamber |
| 18 | Earth point, on engine block |
| 83 | Earth connection -1-, in front right wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| A104 | Positive (+) connection -2- (15), in dash panel wiring harness |
| A106 | Connection -2- (86s), in dash panel wiring harness |
| D14 | Connection (ignition coil - control unit), in front right wiring harness |
| N163 | Ignition coil 4 |
| N164 | Ignition coil 5 |
| N189 | Ignition coil 6 |
| N192 | Final output stage 2 |
| P | Spark plug connector |
| Q | Spark plugs |
| T3x | 3-pin connector, brown, on ignition final output stage |
| T4g | 4-pin connector, brown, on ignition final output stage |
| T10ar | 10-pin connector, orange, connector point, electronics box, plenum chamber |
| 18 | Earth point, on engine block |
| 83 | Earth connection -1-, in front right wiring harness |
| A20 | Connection (15a), in dash panel wiring harness |
| D14 | Connection (ignition coil - control unit), in front right wiring harness |
| * | Only models with cruise control system |
| D | Ignition/starter switch |
| F4 | Reversing light switch |
| H | Horn plate |
| H2 | High tone horn |
| H7 | Low tone horn |
| J4 | Dual tone horn relay |
| S7 | Fuse in fuse box |
| S10 | Fuse in fuse box |
| S12 | Fuse in fuse box |
| S13 | Fuse in fuse box |
| S14 | Fuse in fuse box |
| S231 | Fuse in fuse box |
| S232 | Fuse in fuse box |
| T5g | 5-pin connector, behind steering column switch trim |
| T6a | 6-pin connector, red, right connector point, A pillar |
| T10ad | 10-pin connector, red, left connector point, A pillar |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A50 | Positive (+) connection (30as), in dash panel wiring harness |
| A72 | Connection (71), in dash panel wiring harness |
| A90 | Connection (dual tone horn), in dash panel wiring harness |
| G76 | Vehicle level sender, rear left (electrical headlight range control) |
| G78 | Vehicle level sender, front left (electrical headlight range control) |
| J431 | Headlight range control, control unit |
| T4m | 4-pin connector, black, under rear seat, left |
| T6a | 6-pin connector, red, right connector point, A pillar |
| T8g | 8-pin connector, headlight, right |
| T8h | 8-pin connector, headlight, left |
| T10ac | 10-pin connector, blue, right connector point, A pillar |
| T10ad | 10-pin connector, red, left connector point, A pillar |
| T10ae | 10-pin connector, light pink, left connector point, A pillar |
| V48 | Headlight range control motor, left |
| V49 | Headlight range control motor, right |
| 135 | Earth connection -2-, in dash panel wiring harness |
| A60 | Connection (vehicle speed signal), in dash panel wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| E4 | Headlight dipper/flasher switch |
| J124 | Bulb monitoring device, rear |
| L13 | Left gas discharge lamp |
| L14 | Right gas discharge lamp |
| M30 | Main beam bulb, left |
| M32 | Main beam bulb, right |
| N195 | Gas discharge lamp starter unit |
| S18 | Fuse in fuse box |
| S19 | Fuse in fuse box |
| S20 | Fuse in fuse box |
| S21 | Fuse in fuse box |
| T6 | 6-pin connector, light pink, right connector point, A pillar |
| T8g | 8-pin connector, headlight, right |
| T8h | 8-pin connector, headlight, left |
| T10ae | 10-pin connector, light pink, left connector point, A pillar |
| 176 | Earth connection, in right headlight wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| A9 | Positive (+) connection (56b), in dash panel wiring harness |
| A51 | Connection (56), in dash panel wiring harness |
| F1 | Oil pressure switch |
| F66 | Coolant shortage indicator switch |
| G | Fuel gauge sender |
| G6 | Fuel pump |
| G8 | Oil temperature sender |
| G22 | Speedometer sender (Hall sender, on gearbox) |
| J218 | Combi-processor in dash panel insert |
| K1 | Main beam warning lamp |
| K2 | Alternator warning lamp |
| K132 | Electronic power control fault lamp |
| T2x | 2-pin connector, black, in engine compartment, left |
| T6e | 6-pin connector, blue, left connector point, A pillar |
| T10a | 10-pin connector, brown, left connector point, A pillar |
| T10m | 10-pin connector, black, connector point, electronics box, plenum chamber |
| T10ao | 10-pin connector, white, left connector point, A pillar |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 81 | Earth connection -1-, in dash panel wiring harness |
| 83 | Earth connection -1-, in front right wiring harness |
| 86 | Earth connection -1-, in rear wiring harness |
| 199 | Earth connection -3-, in dash panel wiring harness |
| * | Applicable for 1999 model year only |
| ** | Applicable from model year 2000 |
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