Checking intake air temperature sender G42 — VW
Checking intake air temperature sender G42 on VW: 16 steps, engines AGD, AHG, AKU. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform code 6N1
- Special tools named: V.A.G 1598/18A
📋 Procedure
- Connect fault readerV.A.G 1551 or vehicle system testerV.A.G 1552 and select engine electronics control unit with "“address word 01”". Engine must be idling. (Connect fault readerV.A.G 1551 and select engine electronics control unit .)
- Press buttons 0 and 8 for function "“Read measured value block”" and confirm entry with Q button.
- Press buttons 0, 0 and 7 for "“Display group number 7”" and confirm entry with Q button.
- If no realistic display appears in display zone 3 or a substitute temperature of 136.8°C is displayed, check intake air temperature sender G42 and line connections to sender as follows:
- Press → button.
- Press buttons 0 and 6 for function "“End data transfer”" and confirm entry with Q button.
- Switch off ignition.
- Remove connector from intake air temperature sender G42(arrow).
- Measure resistance between sender contacts.
- Renew intake air temperature sender G42.
- Connect adapter cable, 68-pinV.A.G 1598/18A to control unit wiring harness.
- Check lines between adapter cable (68-pin)V.A.G 1598/18A and connector for open circuit according to current flow diagram. Contact 1 + socket 64 Contact 2 + socket 33.
- Connect adapterV.A.G 1598/22 to control unit wiring harness.
- Check lines between adapterV.A.G 1598/22 and connector for open circuit according to current flow diagram. Contact 1 + socket 13 Contact 2 + socket 25.
- Also check wiring for short to one another, short to vehicle earth and short to battery positive.
- Renew diesel direct injection system control unit J248.
Other VW procedures
- Checking engine speed sender G28
- Checking needle lift sender G80
- Removing and installing fuel tank with its attachments
- Checking brake light switch F and brake pedal switch F47
- Checking coolant temperature sender G62
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.