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 MANUALSVOLKSWAGEN1999GOLF (1J1) L4-2.0L (AEG)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAPPLICATION AND ID
1999 Volkswagen Golf (1J1) L4-2.0L (AEG)
Computers and Control Systems: Application and ID
1999 Volkswagen Golf (1J1) L4-2.0L (AEG)SECTION Application and ID
On Board Diagnostic (OBD), technical data
Control module identification
The control module version is displayed when the VAG1551 Scan Tool (ST), the VAG1552 mobile scan tool or the VAS5051 vehicle diagnostic, testing and information system is connected and "Engine Electronics" address word 01 is selected.
Technical data
Engine code AEG
System designation Motronic M5.9.2
Exhaust emissions conform to OBD II
On Board Diagnostic (OBD) yes
Output Diagnostic Test Mode yes
Operating mode of data transfer to Rapid data transfer
VAG1551/1552
DTC memory Non-volatile memory 1)
Headiness Code Memory Volatile memory 2)
Heated Oxygen Sensors (HO2S) 2 sensors
Knock control 2 knock sensors
Twin-path intake manifold no
Variable valve timing no
Charge pressure control no
Secondary Air Injection (AIR) system yes
1) Independent of vultage supply.
2) Values are erased when voltage supply is interrupted.
Control module identification
The control module version is displayed when the VAG1551 Scan Tool (ST), the VAG1552 mobile scan tool or the VAS5051 vehicle diagnostic, testing and information system is connected and "Engine Electronics" address word 01 is selected.
Technical data
Engine code AEG
System designation Motronic M5.9.2
Exhaust emissions conform to OBD II
On Board Diagnostic (OBD) yes
Output Diagnostic Test Mode yes
Operating mode of data transfer to Rapid data transfer
VAG1551/1552
DTC memory Non-volatile memory 1)
Headiness Code Memory Volatile memory 2)
Heated Oxygen Sensors (HO2S) 2 sensors
Knock control 2 knock sensors
Twin-path intake manifold no
Variable valve timing no
Charge pressure control no
Secondary Air Injection (AIR) system yes
1) Independent of vultage supply.
2) Values are erased when voltage supply is interrupted.
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.