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 MANUALSVOLKSWAGEN2003JETTA SEDAN (9M2) L4-2.0L (AZG)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONTESTING AND INSPECTION
2003 Volkswagen Jetta Sedan (9M2) L4-2.0L (AZG)
Air Injection: Testing and Inspection
2003 Volkswagen Jetta Sedan (9M2) L4-2.0L (AZG)SECTION Testing and Inspection
Checking Secondary Air System For Proper Seal
Function test
- Select the measuring value "Test-ID 03:
Secondary Air Injection (AIR) system" and check whether the specified values are being reached, Diagnostic mode 6: Check test results of components that are not continuously monitored. Diagnostic Mode 6: Check Test Of Parts Not Constantly Monitored
- End diagnosis and switch ignition off.
If the specified values are not reached:
Checking Proper Seal
- Check the connection pipes and hoses between Secondary Air Injection (AIR) Pump Motor and combination valve for proper seal.
- Repeat function test.
- Check hoses and hose connections for secure seating.
- Repeat function test.
If malfunction is no longer present:
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
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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.