Checking throttle valve for dirt: Audi 1.8 (AMK, ANB, APU, APX, …)
Step-by-step checking throttle valve for dirt for the Audi 1.8: factory workshop text. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 44 workshop diagrams for AMK
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
BAM
Fitting location => Fitting locations overview, Page
24-5
Requirements:
Genuine air cleaner fitted; air cleaner O.K.
Intake air system O.K.
Fuel pressure O.K.
Fuel tank breather system O.K.
Injectors O.K.
Coolant temperature above80°C.
Lambda probe learned values and lambda control O.K.
=>Page
24-161
.
Work sequence=>Page
24-163
Testing lambda probe learned values and lambda control
Test sequence
Connect the vehicle diagnostic, testing and information system VAS 5051 => Page
01-3
, and select the vehicle system "01 - Engine electronics" from the menu. When doing this the engine should be idling.
Display on VAS 5051:
Select the diagnosis function "04 - Basic settings" from the menu -1-.
Display on VAS 5051:
1 -
Enter display group
(figures up to 255)
Using keypad -2-, enter "032" to select "Display group 032" and confirm entry with Q button.
Display on VAS 5051:
Check readout in display zone -2-.
Display zones
1 · 2 · 3 · 4
Display Group 032: Lambda learned values
Display · xx.x % · xx.x %
Indicates · Lambda learned value, Bank 1, Probe 1 / at idling speed (additive) · Lambda learned value, Bank 1, Probe 1 at part throttle (multiplicative)
Specification · -9.0...9.0 % · -25.0...25.0 % · / · /
Work sequence =>Page
24-163
Work sequence
Unplug electrical connector from air mass meter.
Connect the vehicle diagnostic, testing and information system VAS 5051 => Page
01-3
, and select the vehicle system "01 - Engine electronics" from the menu. When doing this the engine should be idling.
Test requirement:
With engine idling, select "address word" 01 and function "initiating basic setting" by pressing "04".
Display on VAS 5051:
1 -
Enter display group
Using the keypad -2-, enter "107" to select "Display group 107" and confirm entry with Q key.
Display on VAS 5051:
Check readout in display zone -4-.
Display zones
1 · 2 · 3 · 4
Display group 107: Lambda control - short test
Display · xxx rpm · x.x % · x.x % · Test ON
Indicates · Engine speed (actual) · Lambda control / average (bank 1) · Lambda control / average (bank 2) · Status of diagnosis
Range · / · / · / · Test OFF / Test ON / Syst. O.K. / Syst. n.O.K.
Specification · Syst. O.K.
If the specification "Syst O.K." is attained in in display field 4:
Press the ◂button.
Again connect air mass meter.
Perform the next work step in the fault table to continue fault finding.
If the specification "SYST. O.K." is not attained in display zone 4:
Press the ◂button.
Clean the air duct in the throttle valve control part with a lint-free cloth and cleaning solvent.
Again perform adaption of throttle valve control part=>Page
24-154
.
Repeat test procedure: lambda control - short test, measured value block 107 in basic setting 04.
Again connect air mass meter.
Erase fault memory=>Page
01-10
.
Perform road test observing notes on safety precautions=>Page
24-1
Fault memory interrogated=>Page
01-8
.
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.
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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.