Additional emission regulations

2009 Audi A6 BaseSECTION Additional emission regulations
WARNING: This page is about a different car, the 2009 Audi S6, 2008 Audi S6, and 2007 Audi S6. 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 Signal voltage > 4.4- 5.5 V
  • LDP, Commanded off
  • Engine speed > 80 RPM
0.5 Seconds
  • Continuous
  • 2 DCY
P2401 Evaporative Emission System Leak Detection Pump Control Circuit Low Signal voltage 3 V
  • LDP Commanded off
  • Engine speed > 80 RPM
0.5 Seconds
  • Continuous
  • 2 DCY
P2402 Evaporative Emission System Leak Detection Pump Control Circuit High Signal current > 2.7-5.5 A
  • LDP Commanded on
  • Engine speed > 80 RPM
0.5 Seconds
  • Continuous
  • 2 DCY
P2403 Evaporative Emission System Leak Detection Pump Sense Circuit/Open Low signal voltage > 10.4 Seconds
  • LDP Commanded off
  • Purge mass integral, 6 g
  • EVAP purge valve, Closed
  • LDP, Activated
  • Altitude, 2600 m
  • IAT, >4° C
  • Delta ambient pressure, 2.5 kPa
  • IAT drop after engine start, 6 K
  • Time after engine start, 2301200 Sec.
  • intake manifold vacuum, >15 kPa
  • ECT, 4115° C
  • ECT at start, 435° C
  • Number of diagnostic attempts, 5
  • Vehicle speed, >25 MPH
  • Selected gear, Any drive
11 Seconds
  • Once/DCY
  • 2 DCY
P2404 Evaporative Emission System Leak Detection Pump Sense Range/Performance High signal voltage > 10.4 V
  • LDP Commanded on
  • EVAP purge valve, Closed
  • LDP, Activated
  • Altitude, 2600 m
  • IAT, >4° C
  • Delta ambient pressure, 2.5 kPa
  • IAT drop after engine start, 6 K
  • Time after engine start, 2301200 Sec.
  • intake manifold vacuum, >15 kPa
  • ECT, 4115° C
  • ECT at start, 435° C
  • Number of diagnostic attempts, 5
  • Vehicle speed, >25 MPH
  • Selected gear, Any drive
11 Seconds
  • Once/DCY
  • 2 DCY
P2414 O2 Sensor Exhaust Sample Error Bank 1, Sensor 1
  • Internal voltage3.7-4.8 V
  • Engine speed, >25 RPM
  • Fuel cut off, Not active
  • Lambda set point, 1.6
  • O2S ceramic temperature, >685° C
  • Low fuel signal On Than wait >600 Sec.
10 Seconds
  • Multiple
  • 2 DCY
P2415 O2 Sensor Exhaust Sample Error Bank 2 Sensor 1
  • Internal voltage2.53.0 V
  • Engine speed, >25 RPM
  • Fuel cut off, Not active
  • Lambda set point, 1.6
  • O2S ceramic temperature, >685° C
  • Low fuel signal On Than wait >600 Sec.
10 Seconds
  • Multiple
  • 2 DCY
P2422 Evaporative Emission System Vent Valve Stuck Closed Check Evaporative Emission (EVAP) Canister Purge Regulator Valve N80. Refer to → Evaporative Emission (EVAP) Canister Purge Regulator Valve N80, checking Time for pressure drop during 2nd leak check 1.45 Sec.
  • EVAP purge valve, Closed
  • LDP, Activated
  • Altitude, 2600 m
  • IAT, >4° C
  • Delta ambient pressure, 2.5 kPa
  • IAT drop after engine start, 6 K
  • Time after engine start, 2301200 Sec.
  • intake manifold vacuum, >15 kPa
  • ECT, 4115° C
  • ECT at start, 435° C
  • Vehicle speed, >25 MPH
  • Selected gear, Any drive
  • Solenoid valve, Commanded off
140 Seconds
  • Once/DCY
  • 2 DCY
P2539 Low Pressure Fuel System Sensor Circuit Signal voltage > 4.8 V   5 Seconds
  • Continuous
  • 2 DCY
P2541 Low Pressure Fuel System Sensor Circuit Low Signal voltage, 2.0 V   5 Seconds
  • Continuous
  • 2 DCY
P2626 O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1 O2S signal front> 4.8 V
  • O2S ceramic temperature, >685° C
  • Modeled exhaust gas temp, 750° C
  • Fuel cut off, Active
  • Engine speed, >25 RPM
  • Low fuel signal, On Than wait >600 Sec.
2 Seconds
  • Multiple
  • 2 DCY
P2629 O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1 O2S signal front> 3, 2 V
  • O2S ceramic temperature, >685° C
  • Modeled exhaust gas temp, 750° C
  • Fuel cut off, Active
  • Engine speed, >25 RPM
  • Low fuel signal, On Than wait >600 Sec.
2 Seconds
  • Multiple
  • 2 DCY
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
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