A4 Mk3
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| 1 - | Air filter bypass flap valve -N275- |
| q | These components (bypass flap with air filter bypass flap valve -N275-) are not installed on certain equipment versions or on vehicles for certain export markets |
| q | If fitted, the bypass flap is located in the air cleaner housing and the air cleaner bypass flap valve -N275- is located on the outside of the air cleaner housing |
| q | Air cleaner - exploded view → Chapter |
| 2 - | Air mass meter -G70- |
| q | Removing and installing → Chapter |
| 3 - | Hall sender -G40- (camshaft position sensor) |
| q | Fitting location → Fig. |
| 4 - | Fuel pressure regulating valve -N276- |
| q | Fitting location → Fig. |
| q | After renewing high-pressure pump or fuel pressure regulating valve -N276-, learnt values must be re-adapted; see „Guided Functions“ in vehicle diagnostic tester |
| q | Removing and installing → Chapter |
| 5 - | Exhaust gas pressure sensor 1 -G450- |
| q | Fitting location → Fig. |
| q | Adaption must be performed after renewing this component |
| q | Removing and installing → Chapter |
| 6 - | Electrical connector |
| q | For exhaust gas temperature sender 4 -G648- (engine codes CAMA, CAMB, CCWA, CCWB, CGKA and CGKB) |
| q | For exhaust gas temperature sender 3 for cylinder bank 1 -G496- (engine code CAPA) |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.26 |
| 7 - | Coolant temperature sender -G62- |
| q | Removing and installing → Rep. gr.19 |
| 8 - | Exhaust gas temperature sender 4 -G648- (engine codes CAMA, CAMB, CCWA, CCWB, CGKA and CGKB) |
| q | Exhaust gas temperature sender 3 for cylinder bank 1 -G496- (engine code CAPA) |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.26 |
| 9 - | Control unit for turbocharger 1 -J724- |
| q | Fitting location → Fig. |
| 10 - | Electrical connector for exhaust gas temperature sender 1 -G235- |
| q | Only fitted on vehicles with engine codes CAPA, CCWA, CCWB |
| q | Fitting location → Fig. |
| q | Exhaust gas temperature sender 1 -G235- → Fig. |
| 11 - | Intake manifold flap motor -V157- |
| q | Fitting location → Fig. |
| q | Cylinder bank 1 |
| q | Intake manifold - exploded view → Chapter |
| 12 - | Fuel return line connection |
| 13 - | Fuel supply line connection |
| 14 - | Oil pressure switch |
| q | Oil pressure switch -F1- (engine codes CAPA, CAMA, CAMB) - fitting location → Fig. |
| q | Oil pressure switch for reduced oil pressure -F378- (engine codes CCWA, CCWB, CGKA, CGKB) - fitting location → Fig. |
| q | Removing, installing and testing → Rep. gr.17 |
| 15 - | Pump for exhaust gas recirculation cooler -V400- |
| q | Fitting location → Fig. |
| 16 - | Fuel temperature sender -G81- |
| q | Fitting location → Fig. |
| 17 - | Radiator outlet coolant temperature sender -G83- |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.19 |
| 18 - | Pressure retention valve |
| q | Fitting location → Fig. |
| q | In return lines from cylinder banks 1 and 2 |
| q | The pressure retention valve maintains a residual pressure of approx. 10 bar in the return lines. |
| q | This residual pressure is required for the control function of the piezo injectors |
| q | The pressure retention valve may only be renewed together with the fuel return lines |
| q | After replacement, engine must be run at idling speed for approx. 2 minutes to bleed fuel system |
| q | Checking pressure retention valve → Chapter |
| 19 - | Injectors (piezo injectors) |
| q | Cylinder bank 1 |
| q | Removing and installing → Chapter |
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| 1 - | Electrical connector |
| q | For exhaust gas temperature sender 3 -G495- (engine codes CAMA, CAMB, CCWA, CCWB, CGKA and CGKB) |
| q | For exhaust gas temperature sender 2 -G448- (engine code CAPA) |
| 2 - | Exhaust gas temperature sender 3 -G495- (engine codes CAMA, CAMB, CCWA, CCWB, CGKA and CGKB) |
| q | Exhaust gas temperature sender 2 -G448- (engine code CAPA) |
| q | Located downstream of starter catalytic converter |
| q | Removing and installing → Rep. gr.26 |
| q | 45 Nm |
| 3 - | Lambda probe -G39- with Lambda probe heater -Z19- |
| q | Fitting location → Fig. |
| q | Removing and installing → Chapter |
| q | 50 Nm |
| 4 - | Intake manifold flap 2 motor -V275- |
| q | Cylinder bank 2 |
| q | Intake manifold - exploded view → Chapter |
| 5 - | Connector for Lambda probe -G39- |
| q | Fitting location → Fig. |
| 6 - | Engine control unit -J623- |
| q | Fitting location → Fig. |
| q | Removing and installing → Chapter |
| 7 - | Charge pressure sender -G31- |
| q | With intake air temperature sender -G42- |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.21 |
| 8 - | Throttle valve module -J338- |
| q | 9 Nm |
| 9 - | Fuel pressure sender -G247- |
| q | Fitting location → Fig. |
| q | Removing and installing → Chapter |
| 10 - | Injectors (piezo injectors) |
| q | Cylinder bank 2 |
| q | Removing and installing → Chapter |
| 11 - | Exhaust gas recirculation cooler change-over valve -N345- |
| q | Fitting location → Fig. |
| q | Overview of exhaust gas recirculation system → Rep. gr.26 |
| 12 - | Exhaust gas recirculation control motor -V338- |
| 13 - | High-pressure fuel pump |
| q | With fuel metering valve -N290- |
| q | On vehicles with engine codes CAMA, CAMB, CCWA, CCWB, CGKA and CGKB, a first fuel filling operation MUST be performed after the high-pressure pump has been renewed (the pump must NOT be allowed to run while it is still empty) → Chapter |
| q | After renewing high-pressure pump or fuel pressure regulating valve -N276-, learnt values must be re-adapted; see „Guided Functions“ in vehicle diagnostic tester |
| q | High-pressure pump - exploded view, engine codes CAMA, CAMB, CCWA, CCWB, CGKA, CGKB → Chapter |
| q | Removing and installing, engine codes CAMA, CAMB, CCWA, CCWB, CGKA, CGKB → Chapter |
| q | High-pressure pump - exploded view, engine code CAPA → Chapter |
| q | Removing and installing, engine code CAPA → Chapter |
| 14 - | Fuel metering valve -N290- |
| q | Do not unscrew |
| q | Screwed directly into high-pressure fuel pump |
| 15 - | Exhaust gas recirculation temperature sensor -G98- |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.26 |
| 16 - | Connector for exhaust gas recirculation temperature sensor -G98- |
| 17 - | Vacuum unit |
| q | For change-over flap for exhaust gas recirculation cooler |
| A - | Relay and fuse holder in electronics box in plenum chamber (left-side) |
| q | Removing and installing engine control unit -J623- with altitude sensor → Chapter |
| q | Fitting locations → Current flow diagrams, Electrical fault finding and Fitting locations |
| B - | Low heat output relay -J359- and high heat output relay -J360- |
| q | Fitting locations → Current flow diagrams, Electrical fault finding and Fitting locations |
| C - | Brake light switch -F- and brake pedal switch -F47- |
| q | In footwell on brake pedal |
| D - | Accelerator position sender -G79- and accelerator position sender 2 -G185- |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.20 |
| E - | Exhaust gas temperature sender 1 -G235- |
| q | Only fitted on vehicles with engine codes CAPA, CCWA, CCWB |
| q | On turbocharger |
| q | 45 Nm |
| q | Removing and installing → Rep. gr.26 |
| F - | Engine speed sender -G28- |
| q | Fitting location → Fig. |
| G - | Supplementary fuel pump -V393- |
| q | Only fitted on vehicles with engine codes CAMA, CAMB, CCWA, CCWB, CGKA, CGKB |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.20 |
| H - | Oil pressure switch -F22- |
| q | Only fitted on vehicles with engine codes CCWA, CCWB, CGKA, CGKB |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.17 |
| I - | Valve for oil pressure control -N428- |
| q | Only fitted on vehicles with engine codes CCWA, CCWB, CGKA, CGKB |
| q | Fitting location → Fig. |
| q | Removing and installing → Rep. gr.17 |
| J - | Particulate filter |
| q | Fitted on underbody |
| q | Combined with a catalytic converter |
| q | Adaption must be performed after renewing this component |
| q | Removing and installing → Rep. gr.26 |
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