Fuel and air mixture, additional emissions regulations

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

DTC	Error Message	Diagnostic Procedure	Malfunction Criteria and Threshold Value	Secondary Parameters with Enable Conditions	Monitoring Time Length	Frequency of checks, MIL Illumination
P1081	Exhaust Bank 3, mixture adaptation range 1. Lower lean limit not reached (AVK only)	Check the fuel pressure. Refer to → Fuel Delivery, Checking . Check the fuel injectors N30, N31, N32, N33, N83, N84. Refer to → Fuel Injector, Checking . Check the Heated Oxygen Sensor (HO2S) G39. Refer to Heated Oxygen Sensor (HO2S) G39, checking . Check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130. Refer to Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130, checking . Check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80. Refer to → EVAP Canister Purge Regulator Valve N80, Checking . Check the intake system for leaks (false air). Check the exhaust system for proper seal. Check the vacuum lines for leaks	System too lean >+4% Within adaptive range System too rich -4%	Lamda Adaptation Active Lambda control Closed loop EVAP purge valve Closed Engine temp. - >70°C Or Substitute temp. >70°C Time after start >351 sec. Idle adaptation range: Engine speed 720/min Air mass - 19kg/h Part load adaptation Ready	50 Sec. or if fuel tank empty or fuel gage defect: calculated air mass flow >200kg	2 DCY
P1296	Malfunction in cooling system (AVK only)	Check the Engine Coolant Temperature (ECT) Sensor G62. Refer to → Engine Coolant Temperature (ECT) Sensor G62, Checking . Check the thermostat. Refer to Fuel Supply System .	Measured temp. >8.25 K Lower than model temp Measured temp. 60°C	---	Once/DCY	2 DCY

DTC

Error Message

Diagnostic Procedure

Malfunction Criteria and Threshold Value

Secondary Parameters with Enable Conditions

Monitoring Time Length

Frequency of checks, MIL Illumination

P1081

Exhaust Bank 3, mixture adaptation range 1. Lower lean limit not reached

(AVK only)

Check the fuel pressure. Refer to → Fuel Delivery, Checking .
Check the fuel injectors N30, N31, N32, N33, N83, N84. Refer to → Fuel Injector, Checking .

Check the Heated Oxygen Sensor (HO2S) G39. Refer to Heated Oxygen Sensor (HO2S) G39, checking .
Check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130. Refer to Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130, checking .

Check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80. Refer to → EVAP Canister Purge Regulator Valve N80, Checking .
Check the intake system for leaks (false air).

Check the exhaust system for proper seal.
Check the vacuum lines for leaks

System too lean >+4%
Within adaptive range

System too rich -4%

Lamda Adaptation Active
Lambda control Closed loop

EVAP purge valve Closed
Engine temp. - >70°C Or Substitute temp. >70°C

Time after start >351 sec.
Idle adaptation range: Engine speed 720/min

Air mass - 19kg/h
Part load adaptation Ready

50 Sec. or if fuel tank empty or fuel gage defect: calculated air mass flow >200kg

2 DCY

P1296

Malfunction in cooling system

(AVK only)

Check the Engine Coolant Temperature (ECT) Sensor G62. Refer to → Engine Coolant Temperature (ECT) Sensor G62, Checking .
Check the thermostat. Refer to Fuel Supply System .

Measured temp. >8.25 K Lower than model temp
Measured temp. 60°C

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Once/DCY

2 DCY