sensor AUDI A4 1999 B5 / 1.G APB Engine Motronic Syst

01-7

Mode under Address word 33:
Mode 1: Transmit diagnostic data Switch ignition on or let engine run at idle
Mode 2: Transmit operating conditions Switch ignition on or let engine run at idle
Mode 3: Check DTC Memory Switch ignition on or let engine run at idle
Mode 4: Erase diagnostic data Switch ignition on or let engine run at idle
Mode 5: Output of oxygen sensor signals Switch ignition on or let engine run at idle
Mode 6: Transmit measured values Switch ignition on or let engine run at idle
Mode 7: Check DTC Memory Switch ignition on or let engine run at idle
Mode 8: Check tank leak test Switch ignition on or let engine run at idle
Mode 9: Read out vehicle information Let engine run at idle Mode 1 to 9 can be selected under address word 33.

Individual measured values can be read out under mode 1. Mode 1 is not recommended for authorized Audi service
centers, since the data can be obtained much more accurately under address word 01 function 04 or function 08.
Mode 2 displays operating conditions, for which malfunctions are recognized.
With mode 3 the DTC memory will be checked and with mode 4 the DTC memory will be erased.
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01-8

Mode 5 displays the static dimensions of the oxygen sensors, which are legally required. Since these dimensions are not
directly relevant to oxygen sensor diagnostics, mode 5 is insignificant for the authorized Audi center.
With mode 6 all measured values can be checked from components and systems that are not constantly monitored.
Using mode 7, DTCs can be checked for which the Malfunction Indicator Light (MIL) is not yet lit (MIL is not on, no DTCs
under mode 3).
Under mode 8 the tank leak test will be checked.
With mode 9 the following vehicle information can be read out: Vehicle Identification Number (VIN), Part number and
program/data level of the engine control module and the check sum (this value is a internal calculated value).
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01-19
Diagnostic Trouble Code (DTC) table

Notes:

If malfunctions occur in the sensors and components being monitored, they will be stored in the DTC memory together
with an indication of the type of malfunction. Notes on Engine Power Control (EPC) (drive by wire) Page 24
-139
.
Malfunctions relating to the electronic throttle are also indicated by the EPC (Electronic Power Control) warning light in the
instrument cluster.
Malfunction which decrease exhaust emissions are indicated by an Exhaust Malfunction Indicator Light (MIL), the MIL is
located in the instrument cluster. As soon as certain malfunction are recognized, the MIL is switched on immediately.
There are also malfunctions, were the MIL is switched on only after the engine is started again.
Sporadically occurring malfunctions (temporary malfunctions) will be indicated on the VAG1551 display as "SP."
The DTC table is arranged according to the 5-digit DTC in the left-hand column.
If a malfunction is stored in the DTC memory and then does not occur again during the next 40 engine warm-up phases,
the DTC will be automatically erased.
Components that are indicated as being faulty by the VAG1551 should not be replaced immediately. Always start by
checking the wiring, connectors and Ground (GND) connections for the component using the current wiring diagram. This
is particularly important in the case of sporadic malfunctions (indicated by the letters "SP"on the scan tool display).
If the connector for the engine control module is disconnected or if the battery is disconnected, all the learned values
(adaptation values) stored in the control module will be erased, although the contents of the DTC memory will remain
intact. The next time the engine is started the idling may be rough at first. In this case let the engine run at idle for a few
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01-20

DTC
Description of malfunction
Corrective action
SAE
VAG


P0101 16485 Mass Air Flow (MAF) sensor -
G70-
Implausible signal - Check Mass Air Flow (MAF) sensor Page 24
-59
P0102 16486 Mass or Volume Air Flow
Circuit
Low input
2) - Check Mass Air Flow (MAF) sensor -G70 Page 24
-59
P0103 16487 Mass or Volume Air Flow
Circuit
High Input
2)

P0106 16490 Manifold Abs.Pressure or
Bar. Pressure
Range/Performance
2) 4)
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair
Group 21; Turbocharger; Checking Charge Air Pressure Sensor -G31
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
4) Absolute manifold pressure will be determined by the Charge Air Pressure Sensor -G31 (instead of displayed -G71), the air
pressure is determined by the Barometric Pressure (BARO) Sensor -F96 (in Engine Control Module (ECM))
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01-21

DTC
Description of malfunction
Corrective action
SAE
VAG


P0112 16496 Intake Air Temp. Circ.
Low Input
2) - Check Intake Air Temperature (IAT) sensor Page 28
-17
P0113 16497 Intake Air Temp.
High Input
2)
P0116 16500 Engine Coolant Temp. Circ.
Range/Performance - Check Engine Coolant Temperature (ECT) sensor Page 28
-25
P0117 16501 Engine Coolant Temp. Circ.
Low Input
2)
P0118 16502 Engine Coolant Temp. Circ.
High Input 2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
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01-22

DTC
Description of malfunction
Corrective action
SAE
VAG


P0130 16514 02 Sensor Circ., Bank1-
Sensor1
Malfunction
2) - Check oxygen sensor control or oxygen sensor heater and wiring
Page 24
-79

P0131 16515 02 Sensor Circ., Bank1-
Sensor1
Low Voltage
2)
P0132 16516 02 Sensor Circ., Bank1-
Sensor1
High Voltage 2)
P0133 16517 02 Sensor Circ., Bank1-
Sensor1
Slow Response2)
P0134 16518 02 Sensor Circ., Bank1-
Sensor1
No Activity Detected
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
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01-23

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0136 16520 02 Sensor Circ., Bank1-
Sensor2
Malfunction
2) - Check oxygen sensor heater Page 24
-114
P0137 16521 02 Sensor Circ., Bank1-
Sensor2
Low Voltage
2) - Check oxygen sensor signal wire and activation Page 24
-122
P0138 16522 02 Sensor Circ., Bank1-
Sensor2
High Voltage
2)
P0139 16523 02 Sensor Circ., Bank1-
Sensor2
Slow Response2) - Check oxygen sensor and oxygen sensor control behind catalytic
converter Page 24
-100

P0140 16524 02 Sensor Circ., Bank1-
Sensor2
No Activity Detected
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
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01-24

DTC
Description of malfunction
Corrective action
SAE
VAG


P0150 16534 02 Sensor Circ., Bank2-
Sensor1
Malfunction
2) - Check oxygen sensor control or oxygen sensor heater and wiring
Page 24
-79

P0151 16535 02 Sensor Circ., Bank2-
Sensor1
Low voltage
2)
P0152 16536 02 Sensor Circ., Bank2-
Sensor1
High Voltage 2)
P0153 16537 02 Sensor Circ., Bank2-
Sensor1
Slow Response 2)
P0154 16538 02 Sensor Circ., Bank2-
Sensor1
No Activity Detected
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
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01-25

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0156 16540 02 Sensor Circ., Bank2-
Sensor2
Malfunction
2) - Check oxygen sensor heater Page 24
-114
P0157 16541 02 Sensor Circ., Bank2-
Sensor2
Low Voltage
2) - Check oxygen sensor signal wire and activation Page 24
-122
P0158 16542 02 Sensor Circ., Bank2-
Sensor2
High Voltage
2)
P0159 16543 02 Sensor Circ., Bank2-
Sensor2
Slow Response 2) - Check oxygen sensor and oxygen sensor control behind catalytic
converter Page 24
-100

P0160 16544 02 Sensor Circ., Bank2-
Sensor2
No Activity Detected
2) - Check oxygen sensor heater Page 24
-114
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
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01-26

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0236 16620 Charge air pressure
sensor -G31-
Implausible signal Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s):
APB, Repair Group 21; Boost pressure system with turbocharger; charge air pressure sensor
-G31
-, checking

P0237 16621 Turbocharger Boost
Sensor (A) Circ
Low Input
2) Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 21;
Turbocharger; Checking Charge Air Pressure Sensor -G31
P0238 16622 Turbocharger Boost
Sensor (A) Circ
High Input
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
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