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 MANUALSVOLKSWAGEN1991JETTA L4-1984CC 2.0L DOHCREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSRECALLSEMISSIONSRECALL - REVISED VEHICLE SYSTEM WORK PROCEDURESWORK PROCEDUREG. CHECK/REPLACE ENGINE CONTROL MODULE
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
G. Check/Replace Engine Control Module
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION G. Check/Replace Engine Control Module
G. Check/replace Engine Control Module
(ECM) (vehicles with manual transmission)
- Connect Engine Scan Tool VAG 1551 and check Part No. of installed engine ECM.
^ must be Part No. 8AO 907 404H
^ If NOT, replace ECM with Part No. 8A0 907 404H
(ECM) (vehicles with manual transmission)
- Connect Engine Scan Tool VAG 1551 and check Part No. of installed engine ECM.
^ must be Part No. 8AO 907 404H
^ If NOT, replace ECM with Part No. 8A0 907 404H
RENDER: 1.0x
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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.