• Power stage temperature
> 140° C

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 359

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P2195

O2 Sensor Signal Stuck Lean
Bank 1 Sensor 1

• Measured oxygen
concentration @ fuel cutoff
> 25.6%
or
• Measured oxygen
concentration @ part load
> (calculated) 11%

P2196

O2 Sensor Signal Stuck Rich
Bank 1 Sensor 1

Measured oxygen
concentration @ fuel cutoff
> 14.7%

P220A

NOx Sensor Front Circuit
Supply Voltage

Sensor supply voltage > 1.5 or
< 12 V

P220B

NOx Sensor Rear Supply
Voltage Circuit

Sensor supply voltage > 1.5

P2200

NOx Sensor Front Circuit
Failure

NOx sensor signal ratio of
validity > = 0.50 [-]

P2201

NOx Sensor Front Circuit
Range / Performance

• NOx 40 - 70%, time > 5 Sec.
or 40% value not reached
within 7 Sec.
• Ratio > 3 or < -0.75
• Average NOx offset value
> 50 or < -30 ppm
NOx value < -105 ppm

P2202

NOx Sensor Front Circuit Low

P2203

NOx Sensor Front Circuit High NOx value > 1655 ppm

P2209

NOx Sensor Front Rationality
Check

NOx control active time since
dew point exceeded > 180

P2237

O2 Sensor Positive Current
Control Circuit Bank 1 Sensor
1 Open

Measured oxygen
concentration < 0.005

P2243

O2 Sensor Reference Voltage
Circuit Bank 1 Sensor 1 Open

• O2S internal resistance > 3 V
• Oxygen signal < -1.3 V or
> 1.5 V

P2251

O2 Sensor Negative Current
Control Circuit Bank 1 Sensor
1 open

O2S internal resistance voltage
>3V

360 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Error Message

Malfunction Criteria and
Threshold Value

P226C

Turbocharger Boost Control
"A" Slow Response

Boost difference between
target and measured
< -6976[J]

P2279

Turbocharger Boost Pressure
Intake Air System Leak

Ratio of measured and
modeled air mass flow 0.45 0.80

P229E

NOx Sensor Rear Circuit
Short or Open

• Message From NOx Sensor
= Failure
or
• NOx sensor status ratio of
validity ≥ 0.5[-]

P229F

NOx Sensor Rear Circuit
Range /Performance

• Average NOx offset value
> 50 ppm
• Number of checks = 2[-]
or
• Average NOx offset value
< - 30 ppm
• Number of checks = 2[-]
or
• Measured oxygen
concentration compared
with calculated oxygen
concentration deviation @
part load > 5.3%

P2294

Fuel Pressure Metering Valve
Control Circuit Open

Signal voltage < 4.7 V

P2295

Fuel Pressure Metering Valve
Control Circuit Grounded

Signal voltage < 2.97 V

P2296

Fuel Pressure Metering Valve Signal current ˃ 3.0 A
Control Circuit Short to Battery
Voltage

P22A0

NOx Sensor Rear Circuit Low

NOx value < -105 ppm

P22A1

NOx Sensor Rear Circuit High

NOx value > 1655 ppm

P22A7

NOx Sensor rear Rationality
check

NOx control active time since
dew point exceeded >180 s

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 361

DTC Chart

DTC

Additional Emissions Regulations
DTC

Error Message

Malfunction Criteria and
Threshold Value

P240F

EGR Slow Response

• Calculated characteristically
value: Negative gradients of
target air mass flow > 35 [-]
or
• Calculated characteristically
value: Positive gradients of
Target air mass flow > = 30 [-]

P242A

Exhaust Gas Temperature
Sensor Circuit Bank 1 Sensor
3

Signal voltage > 2.61 V

P242B

Exhaust Gas Temperature
Sensor Circuit Bank 1 Sensor
3 Range/Performance

• Temperature difference to
EGR temp, T3, T4, T5, T6
> 40° K
or
• Mean value of modeled measured T5 > 100° K

P242C

Exhaust Gas Temperature
Sensor Circuit Low Bank 1
Sensor 3

Signal voltage < 0.68 V

P2425

Exhaust Gas Recirculation
Cooling Valve Control Circuit
Open

Diagnostic signal from power
stage < 4.7 V

P2426

Exhaust Gas Recirculation
Cooling Valve Control Circuit
Grounded

Diagnostic signal from power
stage < 2.97 V

P2427

Exhaust Gas Recirculation
Cooling Valve Control Circuit
Shorted Battery Voltage

Diagnostic signal from power
stage > 2.2 A

P244C

Exhaust Temperature Too
Low For Particulate Filter
Regeneration Bank 1

Time to closed loop 120 300 Sec.

P245B

Exhaust Gas Recirculation
Cooler Bypass Control Circuit
Range/Performance

• Positive difference between
measured and target
temperature too high = 10.0
- 70.0 [K]
or
• Negative difference between
measured and target
temperature too low = -12.0
-7.0 [K]

362 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013

Error Message

Malfunction Criteria and
Threshold Value

P2452

Diesel Particulate Filter
Differential Pressure Sensor
Circuit

Sensor voltage > 4.9 V

P2453

Diesel Particulate Filter
Differential Pressure Sensor
Circuit Range/Performance

Pressure drop > 3 kPa or
< -3 kPa

P2454

Diesel Particulate Filter
Differential Pressure Sensor
Circuit Low

Sensor voltage < 0.2 V

P2458

Diesel Particulate Filter
Regeneration Duration

Time of regen duration
> 3600 Sec.

P2459

Diesel Particulate Filter
Regeneration Frequency

Measured soot mass > f
(volumetric flow rate) grams

P246E

Exhaust Gas Temperature
Sensor Circuit Bank 1
Sensor 4

Signal voltage > 1652 mV

P246F

Exhaust Gas Temperature
Sensor Circuit Bank 1 Sensor
4 Range/Performance

• Temperature difference to
EGR temp, T3, T4, T5, T6
> 40° K
or
• Mean value of modeled measured T5 > 100° K

P2463

Diesel Particulate Filter - Soot
Accumulation

Calculated particulate matter
trap loading > 40 g

P247A

Exhaust Gas Temperature Out Control deviation (T5) > 200 K
of Range Bank 1 Sensor 3
or < -100 K

P2470

Exhaust Gas Temperature
Sensor Circuit Low Bank 1
Sensor 4

Signal voltage < 330 mV

P24AE

PM Sensor Functional check /
Shorted or Open

• Current (IDE) @
measurement 1 < 2 µA
• Difference between current
(IDE) measurement 1 and 2
or
• Signal voltage positive
connection (IDE) > 4.7 [V]
• Signal voltage positive
connection (IDE) < 0.3 [V]

P24AF

PM Sensor Monitoring,
Rationality Check

• Signal current (IDE) > 5 µA
or
• Accumulated change in
heater voltage ≤ 0.40 V

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 363

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P24B1

PM Sensor Circuit Shorted or
Open

• Signal voltage negative
connection (IDE) > 4.1 [V]
• Signal voltage negative
connection (IDE) = 0.0 [V

P24B3

PM Sensor Heater functional
check

• Heater Coil resistance > 1.06
- 2.31 O
• Heater Coil resistance < 2.94
- 5.13 O

P24B5

PM Sensor Heater Short to
ground

• Heating Current < 1.0 A
or
• Heating Current > 15.0 A

P24B6

PM Sensor Heater Short to
Battery Voltage

Heating Current ≥ 0.2 A

P24C7

PM Sensor Plausibility Check

Measured sensor temperature
- mean value of modelled
temperature < - 100 °K

P24D0

PM Sensor Monitoring, Range
/ Performance Check

Signal range check low:
Difference between measured
PM Sensor supply wire voltage
and battery voltage (ECM):
• Value > 1.90 [V]
or
• Value > 2.60 [V]
or
• Value > 3.00 [V]
Signal Range Check High:
difference between measured
battery voltage (ECM) and
Sensor supply wire voltage:
• Value > 3.00 [V]
or
• Value > 2.10 [V]
or
• Value > 1.10 [V]

P2564

Turbocharger Boost Control
Position Sensor Circuit Low

Sensor signal voltage < 0.15 V

P2565

Turbocharger Boost Control
Position Sensor Circuit High

Position sensor signal ≥ 4.85 V

P261A

Coolant Pump "B" Control
Circuit/Open

• Open circuit Signal voltage
1.8 V

P268A

Fuel Injector Calibration Not
Accumulated / Programmed

Accumulated global release
time of zero fuel calibration
but disabled by rail pressure
deviation

P310E

Exhaust gas recirculation
cooler bypass valve 2
Implausible signal

Measured temperature < 0.8

P3348

Turbocharger Control Module
Circuit Malfunction

• Diagnostic signal from power
stage > 8 - 18 A
or
• Diagnostic signal from power
stage > 5 V or < 3.4 V

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 365

DTC Chart

DTC

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derived from the information, illustrations or descriptions in this manual.
The texts, illustrations and standards in this manual are based on the
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All rights under the copyright laws are expressly reserved by Audi of
America. Subject to alteration and amendment.
Printed in the United States
© 2013 Audi of America, Inc.

September 2013