Additional emission regulations

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 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 Illum
P2400	Evaporative Emission System Leak Detection Pump Control Circuit/Open	Check the Leak Detection Pump (LDP) V144. Refer to → Leak Detection Pump (LDP) V144 , Checking Check the Evaporative Emission (EVAP) Canister System for proper seal. Refer to → EVAP System, Checking for Leaks .	Open circuit >0.8 mA	LDP, Commanded on Engine speed >416 RPM	2 Seconds	Continuous 2 DCY
P2401	Evaporative Emission System Leak Detection Pump Control Circuit Low	Check the Leak Detection Pump (LDP) V144. Refer to → Leak Detection Pump (LDP) V144 , Checking Check the Evaporative Emission (EVAP) Canister System for proper seal. Refer to → EVAP System, Checking for Leaks .	Short to ground >2 V	LDP, Commanded off Engine speed >416 RPM	2 Seconds	Continuous 2 DCY
P2402	Evaporative Emission System Leak Detection Pump Control Circuit High	Check the Leak Detection Pump (LDP) V144. Refer to → Leak Detection Pump (LDP) V144 , Checking Check the Evaporative Emission (EVAP) Canister System for proper seal. Refer to → EVAP System, Checking for Leaks .	Signal current > 1 A	LDP, Commanded on Engine speed >416 RPM	2 Seconds	Continuous 2 DCY
P2403	Evaporative Emission System Leak Detection Pump Sense Circuit/Open	Check the Leak Detection Pump (LDP) V144. Refer to → Leak Detection Pump (LDP) V144 , Checking Check the Evaporative Emission (EVAP) Canister System for proper seal. Refer to → EVAP System, Checking for Leaks .	Low signal voltage > 1 time Sec.	LDP Commanded on EVAP purge valve, Closed LDP, Activated Altitude, 2500 M Number of diagnostic attempts, 2 IAT, >5.25°C Delta ambient pressure, 0.3 kPa IAT drop after engine start, 9.75 K Time after engine start, >2101200 Sec. ECT at start, 4.5-35°C Vehicle speed, >6 MPH	10 Seconds	Once/DCY 2 DCY
P2404	Evaporative Emission System Leak Detection Pump Sense Range/Performance	Check the Leak Detection Pump (LDP) V144. Refer to → Leak Detection Pump (LDP) V144 , Checking Check the Evaporative Emission (EVAP) Canister System for proper seal. Refer to → EVAP System, Checking for Leaks .	High signal voltage > 0.36 time Sec.	LDP Commanded on EVAP purge valve, Closed LDP, Activated Altitude, 2500 M Number of diagnostic attempts, 2 IAT, >5.25°C Delta ambient pressure, 0.3 kPa IAT drop after engine start, 9.75 K Time after engine start, >2101200 Sec. ECT at start, 4.5-35°C Vehicle speed, >6 MPH	10 Seconds	Once/DCY 2 DCY
P2414	O2 Sensor Exhaust Sample Error Bank 1, Sensor 1	Check the Heated Oxygen Sensor (HO2S) G39. Refer to → Heated Oxygen Sensor (HO2S) before Catalytic Converter, Checking .	O2S signal front >3.1 V	Lambda control, Active Engine torque, Positive Engine speed, No idle	25 Seconds	Continuous 2 DCY
P2415	O2 Sensor Exhaust Sample Error Bank 2, Sensor 1	Check the Heated Oxygen Sensor (HO2S) 2 G108. Refer to → Heated Oxygen Sensor (HO2S) before Catalytic Converter, Checking .	O2S signal front >3.1 V	Lambda control, Active Engine torque, Positive Engine speed, No idle	25 Seconds	Continuous 2 DCY
P2539	Low Pressure Fuel System Sensor Circuit	Check Low Fuel Pressure Sensor G410. Refer to → Low Fuel Pressure Sensor G410 , Checking .	Signal voltage > 4.8 V		2 Seconds	Continuous 2 DCY
P2540	Low Pressure Fuel System Sensor Circuit Range/Performance	Check Low Fuel Pressure Sensor G410. Refer to → Low Fuel Pressure Sensor G410 , Checking .	Actual pressure 0.08 or >0.8 Mpa	Engine speed, 500-6000 rpm Time after engine start, >30 sec.	5 Seconds	Continuous 2 DCY
P2541	Low Pressure Fuel System Sensor Circuit Low	Check Low Fuel Pressure Sensor G410. Refer to → Low Fuel Pressure Sensor G410 , Checking .	Signal voltage 0.2 V		5 Seconds	Continuous 2 DCY
P2626	O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1	Check the Heated Oxygen Sensor (HO2S) G39. Refer to → Heated Oxygen Sensor (HO2S) before Catalytic Converter, Checking .	O2S signal front >4.7 V	Fuel cut off, >2 sec. Modeled exhaust gas temp, >380°C	4 Seconds	Continuous 2 DCY
P2629	O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1	Check the Heated Oxygen Sensor (HO2S) 2 G108. Refer to → Heated Oxygen Sensor (HO2S) before Catalytic Converter, Checking .	O2S signal front >4.7 V	Fuel cut off, >2 sec. Modeled exhaust gas temp, >380°C	4 Seconds	Continuous 2 DCY