Testing exhaust gas temperature senders: Audi 2.7 (AGB, AZB)
Step-by-step testing exhaust gas temperature senders for the Audi 2.7 (AGB/AZB): factory workshop text.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
AZB
Special tools and workshop equipment required
V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A
V.A.G 1598/31
Checking voltage supply
Switch off ignition.
Unscrew bolts -arrows- and remove engine cover panels -A...C-.
Unplug the connector from the relevant exhaust gas temperature sender.
Connect voltage tester V.A.G 1527 B as follows:
Connector / Contact · Measure against
3 · Engine earth
Operate starter briefly.
The LED should light up.
If the LED does not light up:
Carry out the following tests (marked with dots):
Test fuse No. S234 (in fuse box, socket 34)
Test for open circuit in wiring from exhaust gas temperature sender to fuel pump relay via fuse -S234 (socket 34 in fuse box):
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
Test fuel pump relay .
=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Testing fuel pump relay and activation
Motronic injection and ignition system
Servicing Motronic injection system
Testing fuel pump relay and activation
Connect test box V.A.G 1598/31 to wiring harness for engine control unit.Do notconnect to the engine control unit itself.
=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Testing fuel pump relay and activation
Motronic injection and ignition system
Servicing Motronic injection system
Testing fuel pump relay and activation
Test for open circuit and short to positive or earth in the following wiring connections:
Connector / Contact · Test box V.A.G 1598/31 / Socket
1 (Bank 1) · 61
1 (Bank 2) · 20
2 · 50
If the wiring is OK:
Renew exhaust gas temperature sender.
If the same fault occurs after renewing the exhaust gas temperature sender:
Fit a new engine control unit .
=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Renewing engine control unit
Motronic injection and ignition system
Servicing Motronic injection system
Renewing engine control unit
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
Ask about my car →Other AUDI procedures
- Fitting locations overview
- Checking lambda probe and lambda control after catalytic converter (on vehicles which conform to emission standard EU III)
- Testing air mass meter
- Removing and installing upper section of sump
- Testing data exchange between engine/ABS/gearbox control unit, instrument cluster
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 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.