O2 Circuit No Activity
Detected (Bank 1, Sensor 2)

• Signal voltage .40 - .60 mV
for > 3 Sec
and
• Difference in sensor voltage
with load pulse and voltage
without load pulse (mean value
of 3 measurements) ≥ 2.80 V

P0140

O2S Signal Check - Circuit
Continuity (sensor ground line
open circuit)

• Internal resistance > 80,000Ω
and
• Exhaust temperature > 700° C

P0141

O2 Heater Circuit
(Bank 1, Sensor 2) Out of
Range

Heater resistance 500 10000 Ω

P0145

O2 Circuit Slow Response
(Bank 1, Sensor 2)

• EWMA filtered transient time at
fuel cut off > 0.4 Sec.
• In voltage range 401.4 201.2 mV
• Number of checks (initial
phase) > 3
• Number of checks (step
function) > 3

P0150

O2 Sensor Circuit (Bank 1,
Sensor 1)

Sensor element temperature
< 690° C

P0151

O2 Sensor Circuit, (Bank 1
Bank 2) Low Voltage

Virtual mass < 1.75 V
Nernst voltage < 1.50 V
Adjustment voltage < 3.0 V

P0152

O2 Sensor Circuit (Bank 1,
Sensor 1) High Voltage

Virtual mass > 3.25 V
Nernst voltage > 4.40 V
Adjustment voltage > 7 V

290

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P0153

Error Message
O2 Circuit Slow Response
(Sensor 1, Bank 2)

Malfunction Criteria and
Threshold Value
Symmetric fault:
• Difference of R2L area ratio vs.
L2R area ratio -0.50 - 1.00
• Lower value of both counters
for area ratio R2L and L2R ≥
5 times
Delay Time:
• Gradient ratio ≥ 0.30
• Lower value of both area ratios
R2L and L2R < 0.30
Transient Time:
• Gradient ratio ≥ 0.30
• Gradient ratio ≤ 0.60
• Lower value of both area ratios
R2L and L2R < 0.30
or
• Lower value of both gradient
ratios R2L and L2R < 0.30
Asymmetric fault:
• Difference of R2L area ratio
vs. L2R area ratio NOT (-0.50
- 1.00)
• Values of both counters for
area ratio R2L and L2R ≥ 5
times
Delay Time:
• Gradient ratio ≥ 0.30
• Lower value of both area ratios
R2L and L2R < 0.30
Transient Time:
• Gradient ratio ≥ 0.30)
• Gradient ratio ≤ 0.60
• Lower value of both area ratios
R2L and L2R < 0.30
or
• Lower value of both gradient
ratios R2L and L2R < 0.30

Audi A6/S6 Quick Reference Specification Book

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September 2013

291

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P0155

O2 Heater Circuit (Bank 1,
Sensor 1)

Out of range high
• O2S ceramic temperature
< 725° C
and
• Heater duty cycle > 90.00%
Rationality check (sensor
heating up)
• O2S ceramic temperature
< 725° C
and
• Time after O2S heater on
40.0 Sec

P0156

O2 Circuit (Bank 1, Sensor 2)

Delta O2S signal rear > 2 V

P0157

O2 Circuit Low Voltage (Bank
1, Sensor 2)

• Signal voltage < 0.06 V for
time > 3.0 Sec
and
• Difference of sensor voltage
with load pulse and voltage
without load pulse (mean value
of 3 measurements) < 0.01 V

P0158

O2 Circuit High Voltage (Bank
1, Sensor 2)

Signal voltage > 1.08 V for time
> 5.0 Sec

P0159

O2 Circuit Slow Response
(Bank 1, Sensor 2)

O2S rear signal 640 - 645 mV

P0160

O2S Signal Check - Circuit
Continuity (sensor ground line
open circuit)

• Internal resistance > 80,000Ω
and
• Exhaust temperature > 700° C

P0169

Function Monitoring: Injection
Time

Comparison with fuel quantity
incorrect

P0171

Fuel System Too Lean,
Additive (Bank 1, Bank 2)

Adaptive value > 5.30%

P0172

System Too Rich (Bank 1)

Adaptive value < -5.30%

P0174

Fuel System Too Lean,
Additive (Bank 1, Bank 2)

Adaptive value > 5.30%

P0175

System Too Rich-Additive
(Bank 1, Bank 2)

Adaptive value < -5.30%

292

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DTC

Error Message

Malfunction Criteria and
Threshold Value

Cylinder Head Temperature
Sensor

• Difference between modelled
and measured cylinder head
temperature > 9.8 K
• Difference CHDT (Cylinder
Head Temperature) vs. ECT at
engine start ≥ 24.8 - 39.8 K
or
• Difference CHDT (Cylinder
Head Temperature) vs. IAT at
engine start ≥ 24.8 - 39.8 K
• Difference CHDT (Cylinder
Head Temperature) vs. ECT at
engine start ≤ -(24.8 - 39.8) K
or
• Difference CHDT (Cylinder
Head Temperature) vs. IAT at
engine start ≤ -(24.8 - 39.8) K

P017C

Cylinder Head Temperature
Sensor

Signal voltage < 0.11 V

P017D

Cylinder Head Temperature
Sensor

Signal voltage > 3.10 V

P0190

Fuel Rail Pressure Sensor A
Circuit

Signal voltage > 4.8 V

P0191

Fuel Rail Control Valve, High
Pressure Side

Actual pressure > 10 MPa

P0192

Fuel Rail Pressure Sensor A
Circuit Low Input

Signal voltage < 0.2 V

P0201

Injector Circuit/Open Cylinder 1

• Low side signal current < 2.1 A

P0202

Injector Circuit/Open Cylinder 2

• Low side signal current < 2.1 A

P0203

Injector Circuit/Open Cylinder 3

• Low side signal current < 2.1 A

P0204

Injector Circuit/Open Cylinder 4

• Low side signal current < 2.1 A

P0205

Injector Circuit/Open Cylinder 5

• Low side signal current < 2.1 A

P0206

Injector Circuit/Open Cylinder 6

• Low side signal current < 2.1 A

P0207

Injector Circuit/Open Cylinder 7

• Low side signal current < 2.1 A

Audi A6/S6 Quick Reference Specification Book

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September 2013

DTC Chart

P017B

293

DTC

Error Message

Malfunction Criteria and
Threshold Value

P0208

Injector Circuit/Open Cylinder 8

• Low side signal current < 2.1 A

P0221

Throttle/Pedal Position
Sensor/Switch B Circuit
Range/Performance

• TPS 1 - TPS 2 > 6.30%
or
• TPS 2 calculated value
> 9.00%

P0222

Throttle/Pedal Position
Sensor/Switch B Circuit Low
Input

Signal voltage < 0.16 V

P0223

Throttle/Pedal Position
Sensor/Switch B Circuit High
Input

Signal voltage > 4.88 V

P0234

Turbocharger/Supercharger
Overboost Condition
Rationality Check

Difference of set value boost
pressure vs. actual boost
pressure value > 200 1275 hPa

P0235

Boost Pressure Control

Boost pressure sensor signal vs
target value
• > 27 - 50 kPa, depending on
altitude

P0236

Turbocharger/Supercharger
Boost (Sensor 1) Plausability
Check

• Pressure difference in cross
check between boost pressure
sensor 1/2; IM pressurel
> 7 kPa
• Pressure difference in cross
check between . boost
pressure sensor 1/2 and lM
> 12 - 27 kPa

P0237

Turbocharger/Supercharger
Boost (Sensor 1) Circuit Low

Signal voltage < 0.2 V

P0238

Turbocharger/Supercharger
Boost (Sensor 1) Circuit High

Signal voltage > 4.8 V

294

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DTC

Error Message

Malfunction Criteria and
Threshold Value

Turbocharger/Supercharger
Boost Sensor 2 Rationality
Check

• Pressure difference in cross
check between boost pressure
sensor 1/2; IM pressure,
ambient pressure > 7 kPa
• Pressure difference in cross
check between boost pressure
sensor 1/2; IM pressure
> 12 - 27 kPa
• Pressure difference in cross
check between pressure
sensor 1 and 2 > 12.51 kPa
and fuel trim activity (bank with
deviation is considered to be
defective > 151%

P0241

Turbocharger/Supercharger
Boost Sensor 2 Short to
Ground

Signal voltage < 0.2 V

P0242

Turbocharger/Supercharger
Boost Sensor 2 Short to
Battery Voltage

Signal voltage > 4.8 V

P0243

Turbocharger/Supercharger
Wastegate Solenoid A

Signal voltage > 4.4 - 5.6 V

P0245

Turbocharger/Supercharger
Wastegate Solenoid A Low

Signal voltage < 2.15 - 3.25 V

P0246

Turbocharger/Supercharger
Wastegate Solenoid A High

Signal current > 2.2 A

P025A

Fuel Pump Open Circuit

Signal voltage > 4.8 - 5.3 V

P025C

Fuel Pump Short to Ground

Signal voltage < 2.7 - 3.25 V

P025D

Fuel Pump Short to B+

Signal current > .6 mA

P0261

Cylinder 1 Injector Circuit
Short to Ground

Signal current < 2.1 A

P0262

Cylinder 1 Injector Circuit
Short to B+

Signal current > 14.70 A

P0264

Cylinder 2 Injector Circuit
Short to Ground

Signal current < 2.1 A

P0265

Cylinder 2 Injector Circuit
Short to B+

Signal current > 14.70 A

P0267

Cylinder 3 Injector Circuit
Short to Ground

Signal current < 2.1 A

P0268

Cylinder 3 Injector Circuit
Short to B+

Signal current > 14.70 A

Audi A6/S6 Quick Reference Specification Book

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September 2013