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 MANUALSVOLKSWAGEN1999CABRIO (1V7) L4-2.0L (ABA)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONEGR TEMPERATURE SENSORTESTING AND INSPECTION
1999 Volkswagen Cabrio (1V7) L4-2.0L (ABA)
EGR Temperature Sensor: Testing and Inspection
1999 Volkswagen Cabrio (1V7) L4-2.0L (ABA)SECTION Testing and Inspection
Check With VAG 1551 Scan Tool In "Read Measuring Value Block" Function, Testing Closed Throttle Position.
- VAG 1551 Scan Tool connected with "Read Measuring Value Block" Function Selected Display Group 02.
Indicated On Display:
Read Measuring Value Block 2
1 2 3 4
- No leaks in vacuum lines and hose connections
- Vacuum lines not plugged or kinked
- Engine oil temperature min. 50°C (122°F)
- Disconnect EGR Vacuum Regulator Solenoid Valve (N18) -1-.
- Connect VAG 1390 vacuum pump to the disconnected hose.
- Operate vacuum pump.
- Performance at Closed Throttle Position must get noticeably worse.
If NO:
- Check lines and connections for obstructions and clean if necessary.
- If necessary, Replace EGR Valve.
If Idle Gets Worse:
- Read EGR temperature in display field 4. Temperature must rise steadily without interruption.
- If display reads 127.4°C, or if the temperature drops, there is an interruption.
- As soon as the temperature value reaches 200°C, disconnect vacuum pump.
- Press -> button.
- Press buttons -and -6- for "End Output" Function.
- Press -Q- button to confirm input.
If no fault is found:
- Replace EGR Temperature Sensor (G98).
- VAG 1551 Scan Tool connected with "Read Measuring Value Block" Function Selected Display Group 02.
Indicated On Display:
Read Measuring Value Block 2
1 2 3 4
- No leaks in vacuum lines and hose connections
- Vacuum lines not plugged or kinked
- Engine oil temperature min. 50°C (122°F)
- Disconnect EGR Vacuum Regulator Solenoid Valve (N18) -1-.
- Connect VAG 1390 vacuum pump to the disconnected hose.
- Operate vacuum pump.
- Performance at Closed Throttle Position must get noticeably worse.
If NO:
- Check lines and connections for obstructions and clean if necessary.
- If necessary, Replace EGR Valve.
If Idle Gets Worse:
- Read EGR temperature in display field 4. Temperature must rise steadily without interruption.
- If display reads 127.4°C, or if the temperature drops, there is an interruption.
- As soon as the temperature value reaches 200°C, disconnect vacuum pump.
- Press -> button.
- Press buttons -and -6- for "End Output" Function.
- Press -Q- button to confirm input.
If no fault is found:
- Replace EGR Temperature Sensor (G98).
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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.