Sensor/Switch “A” Circuit
Range/Performance

• TPS 1 - TPS 2 > 5.79%
and
• Relative mass air integral
> 100 at 0.45 s

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 213

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P0122

Throttle/Pedal Position
Sensor/Switch “A” Circuit Low

Signal voltage < 0.117 V

P0123

Throttle/Pedal Position
Sensor/Switch “A” Circuit High

Signal signal voltage > 4.6 [V]

P012B

Turbocharger/Supercharger
Inlet Pressure Sensor
Circuit Range/Performance
Downstream ofThrottle Valve

• Pressure difference in
cross check between boost
pressure sensor 1/2; inlet
charger pressure and ambient
pressure sensor > 7 kPa
• Pressure difference in cross
check between boost pressure
sensor 1/2 and inlet charger
pressure (1) > 12 - 27 kPa
• Depending on engine speed

P012C

Turbocharger/Supercharger
Inlet Pressure Sensor Circuit
High Downstream of Throttle
Valve

Signal voltage < 0.2 V

P012D

Turbocharger/Supercharger
Inlet Pressure Sensor Circuit
High Downstream of Throttle
Valve

Signal voltage > 4.8 V

P0130

O2 Sensor Circuit Bank 1,
Sensor 1

O2S ceramic temperature
< 640° C

P0131

O2 Sensor Circuit Low Voltage Signal voltage < 0.13 V
Bank 1 Sensor 1

P0132

O2 Sensor Circuit High
Voltage Bank 1 Sensor 1

Signal voltage > 5.5 V

P0133

O2 Circuit Slow Response
Bank 1 Sensor 1

Response check- HO2S value
vs modeled HO2S value
> 0.9004

P0135

O2 Sensor Heater Circuit
Bank 1 Sensor 1

UEGO ceramic temperature
< 680 or > 965° C

P0136

O2 Sensor Circuit Bank 1
Sensor 2

Oscillation check
• O2S signal rear not oscillating
at reference +/- 10 mV
Signal range check
• Signal voltage > 0.15 V

P0137

O2 Sensor Circuit Low Voltage • Signal voltage < 20 mV
Bank 1 Sensor 2
and
• Internal resistance < 10 Ohm

P0138

O2 Sensor Circuit High
Voltage Bank 1 Sensor 1

Signal voltage > 1.2 V

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

Error Message

Malfunction Criteria and
Threshold Value

P0139

O2 Circuit Slow Response
Bank 1 Sensor 2

O2S signal rear- signal too
slow- 1

P013A

HO2 Sensor Slow Response Rich to Lean Bank 1 Sensor 2

• Arithmetic filtered max
differential transient time at
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

P013B

HO2 Sensor Slow Response - • Arithmetic filtered max
Lean to Rich Bank 1, Sensor 2
differential transient time at
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

P013C

HO2 Sensor Slow Response Rich to Lean Bank 2 Sensor 2

P013D

Oxygen Sensors Slow
• Arithmetic filtered max
Response - Lean to Rich Bank
differential transient time at
2, Sensor 2
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

P013E

Oxygen Sensors Delayed
• Arithmetic filtered max
Response - Rich to Lean Bank
differential transient time at
1, Sensor 2
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

P013F

HO2 Sensor Delayed
• Arithmetic filtered max
Response - Lean to Rich Bank
differential transient time at
1, Sensor 2
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

P0140

HO2 Sensor Circuit No Activity • Signal voltage, 0.376 - 0.474 V
Detected Bank 1 Sensor 2
• O2S rear internal resistance
> 60 KΩ

P0141

O2 Sensor Heater Circuit
Bank 1 Sensor 2

Heater resistance > 10K Ω

P014A

HO2 Sensor Circuit Delayed
Response - Lean to Rich
Bank 2, Sensor 2

• Arithmetic filtered max
differential transient time at
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

• Arithmetic filtered max
differential transient time at
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 215

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P014B

HO2 Sensor Circuit Delayed
Response - Lean to Rich
Bank 2 Sensor 2

• Arithmetic filtered max
differential transient time at
rich to lean transition ≤ 800
mV/s
• Number of checks ≥ 3

P0151

HO2 Sensor Circuit Low
Voltage Bank 2 Sensor 1

Signal voltage < 0.13 V

P0152

O2 Sensor Circuit High
Voltage (Bank 2 Sensor 1)

Signal voltage > 5.5 V

P0153

HO2 Sensor Circuit Slow
Response Bank 2 Sensor 1

Response check- HO2S value
vs modeled HO2S value
> 0.7998

P0155

HO2 Sensor Heater Circuit
Bank 2, Sensor 1

UEGO ceramic temperature
< 680 or > 965° C

P0156

HO2 Sensor Circuit
Bank 2 Sensor 2

Oscillation check
• O2S signal rear not oscillating
at reference +/- 10 mV
Signal range check
• Signal voltage > 0.2 V

P0157

HO2 Sensor Circuit Low
Voltage Bank 2 Sensor 2

• Signal voltage < 20 mV
and
• Internal resistance < 10 Ohm

P0158

HO2 Sensor Circuit High
Voltage Bank 2 Sensor 2

Signal voltage > 1.2 V

P0159

HO2 Sensor Circuit Slow
Response Bank 2 Sensor 2

• O2S signal rear- signal too
slow- 1
• Maximum allowed rich to lean
switching time

P0160

HO2 Sensor Circuit No Activity • Signal voltage, 0.376 - 0.474 V
Detected
• O2S rear internal resistance
Bank 2 Sensor 2
> 60 KΩ

P0161

HO2 Sensor Heater Circuit
Bank 1, Sensor 2

Heater resistance > 10K Ω

P0169

Incorrect Fuel Composition

Plausibility check failed

P0171

System Too Lean Bank 1

System too lean adaptive value
> 0.0075 [g/rev]

P0172

System Too Rich Bank 1

System too rich adaptive value
< -0.0075 [g/rev]

P0174

System Too Lean Bank 2

System too lean adaptive value
> 0.0075 [g/rev]

P0175

System Too Rich Bank 2

System too rich adaptive value
< -0.0075 [g/rev]

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

Error Message

Malfunction Criteria and
Threshold Value

P017B

Cylinder Head Temperature
Sensor Circuit Range/
Performance

• Measured cylinder head
temperature below modeled
temperature
• Difference ETC vs AAT vs
IAT at engine start < 26.5° C
(depending on engine off time)
map (1)
• Difference CHDT vs ECT
at engine start > 26.5° C
(depending on engine off time)
map (1)
• Difference CHDT vs IAT
at engine start > 26.5° C
(depending on engine off time)
map (1)
• Difference CHDT vs AAT
at engine start > 26.5° C
(depending on engine off time)
map (1)

P017C

Cylinder Head Temperature
Sensor Circuit Low

Cylinder head temperature
> 215 °C

P017D

Cylinder Head Temperature
Sensor Circuit High

Cylinder head temperature
< -60 °C

P0190

Fuel Rail Pressure Sensor "A"
Circuit

Signal voltage > 4.6 V

P0191

Fuel Rail Pressure Sensor "A"
Circuit Range/Performance

Actual pressure > 16.85 MPa

P0192

Fuel Rail Pressure Sensor "A"
Circuit Low

Signal voltage < 0.2 V

P0201

Injector Circuit/Open Cylinder 1

• Signal current < 10 A
and
• Signal voltage > 3.5 V

P0202

Injector Circuit/Open Cylinder 2

• Signal current < 10 A
and
• Signal voltage > 3.5 V

P0203

Injector Circuit/Open Cylinder 3

• Signal current < 10 A
and
• Signal voltage > 3.5 V

P0204

Injector Circuit/Open Cylinder 4

• Signal current < 10 A
and
• Signal voltage > 3.5 V

Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 217

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P0205

Injector Circuit/Open Cylinder 5

• Signal current < 10 A
and
• Signal voltage > 3.5 V

P0206

Injector Circuit/Open Cylinder 6

• Signal current < 10 A
and
• Signal voltage > 3.5 V

P0221

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

• TPS 1 - TPS 2 > 5.79%
and
• Relative mass air integral
> 100 at 0.45 s

P0222

Throttle/Pedal Position
Sensor/Switch “B” Circuit Low

Signal voltage < 0.117 V

P0223

Throttle/Pedal Position
Sensor/Switch “B” Circuit High

Signal voltage > 4.6 V

P0234

Turbocharger / Supercharger
Over-boost Condition
Rationality Check High

Difference set value boost
pressure vs actual boost
pressure value, 200 - 1275 hPa

P0235

Turbo/Super Charger Boost
Sensor “A” Circuit

Difference between actual
measured charge pressure
quotient and target charge
pressure quotient (1)
> 0.25.....35 [-] depending on
altitude

P0236

Turbocharger/Supercharger
Boost Sensor "A" Circuit
Range/Performance

• Pressure difference in cross
check between boost pressure
sensor 1/2; inlet charger
pressure and ambient
pressure sensor > 7 kPa
• Pressure difference in cross
check between boost pressure
sensor 1/2 and inlet charger
pressure (1) > 12 -27 kPa
• Pressure difference in cross
check between boost pressure
sensor 1 and 2 > 12.5 kPa
• Fuel trim activity (bank with
deviation is considered to be
defective) > 15%

P0237

Turbocharger/Supercharger
Boost Sensor "A" Circuit Low

Signal voltage < 0.2 V

P0238

Turbocharger/Supercharger
Boost Sensor "A" Circuit High

Signal voltage > 4.8 V

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

Error Message