Measured value blocks for ignition timing retardation — AUDI
Measured value blocks for ignition timing retardation on Audi: factory workshop procedure for engines APF, AVU, BFQ. Full factory text, tools and checks.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
Measured value blocks for ignition timing retardation
Display group 020 -Ignition- knock control
Normal driving
Read measured value block 20
→
▾Display:
xx.x°BTDC
xx.x°BTDC
xx.x°BTDC
xx.x°BTDC
Ignition timing retardation by knock control, cylinder 4
0 ...12 °crankshaft
Chapter
Ignition timing retardation by knock control, cylinder 3
0 ...12 °crankshaft
Chapter
Ignition timing retardation by knock control, cylinder 2
0 ...12 °crankshaft
Chapter
Ignition timing retardation by knock control, cylinder 1
0 ...12 °crankshaft
Chapter
Note!
The numerical values displayed in zones 1 to 4 represent the actual ignition timing retardation by the knock control for the individual cylinders. The ignition timing is retarded in ° crankshaft (degrees). The displayed
“BTDC”
units can be disregarded.
Display group 022 -Ignition- Knock control
Normal driving
Read measured value block 22
→
▾Display:
xxxx rpm
x.x %
xx.x°crankshaft
xx.x°crankshaft
Ignition timing retardation by knock control, cylinder 2
0 ...12 °crankshaft
Chapter
Ignition timing retardation by knock control, cylinder 1
0 ...12 °crankshaft
Chapter
Engine load
0...100 %
---
Engine speed
760...6500 rpm
---
Note!
The numbers displayed in display zones 1 and 2 represent the actual ignition timing retardation due to the knock control of cylinders one and two. The ignition timing is retarded in ° crankshaft (degrees). The displayed
“BTDC”
units can be disregarded.
Display group 023 -Ignition- Knock control
Normal driving
Read measured value block 23
→
▾Display:
xxxx rpm
x.x %
xx.x°crankshaft
xx.x°crankshaft
Ignition timing retardation by knock control, cylinder 4
0 ...12 °crankshaft
Chapter
Ignition timing retardation by knock control, cylinder 3
0 ...12 °crankshaft
Chapter
Engine load
0...100 %
---
Engine speed
760...6500 rpm
---
Note!
The numbers displayed in display zones 3 and 4 represent the actual ignition timing retardation due to the knock control of cylinders three and four. The ignition timing is retarded in ° crankshaft (degrees). The displayed
“BTDC”
units can be disregarded.
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
- Adjusting pedal position sender
- Removing and installing bracket for auxiliary assemblies
- Removing and installing upper section of intake manifold - vehicles with engine codes AEH, AKL
- Removing and installing parts of the secondary air system
- Removing and installing parts of secondary air system
- 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.