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

01-9

Vehicle diagnostic, testing and
information system VAS5051 or
VAG1551, connecting and selecting
functions


Requirements

Fuses for engine electronics OK
Fuel pump relay OK
Battery voltage at least 11 V
Ground (GND) connection for engine and
transmission OK

- Switch ignition off.

Note:
The Data Link Connector (DLC) is located below the dash, to the left of
the steering column. - Connect vehicle diagnostic, testing and information system VAS5051
with VAS5051/1 diagnostic cable. As an alternative, connect VAG1551
scan tool with VAG1551/3B diagnostic cable.
Pa
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01-27

DTC
Description of malfunction
Corrective action
SAE
VAG


P0300 16684 Random/Multiple Cylinder
Misfire Detected
2) - Check cause for misfire Page 28
-52
P0301 16685
Cyl.1 Misfire Detected
2)
- Check fuel tank level
P0302 16686
Cyl.2 Misfire Detected 2)

P0303 16687
Cyl.3 Misfire Detected 2)

P0304 16688
Cyl.4 Misfire Detected 2)

P0305 16689
Cyl.5 Misfire Detected 2)

P0306 16690
Cyl.6 Misfire 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 .
The Malfunction Indicator Light (MIL) will blink if the Engine Control Module (ECM) recognizes misfire that could damage the
catalytic converters.
Notes:

On malfunction which could be caused by lack of fuel (e.g.: misfire) the malfunction P1250 "Fuel level too low" will be
displayed in addition. That means, the misfiring was detected due to lack of fuel in the tank and not due to a technical
malfunction.
Pa
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01-30

DTC
Description of
malfunction
Corrective action
P0441 16825 EVAP Emission Contr.
Sys. Incorrect
Purge Flow
2) - Check EVAP canister purge regulator valve, perform output Diagnostic Test
Mode (DTM) Page 01
-75

P0442 16826 EVAP Emission Contr.
Sys. (Small Leak)
Leak Detected
2) - Check EVAP system and tank system for leaks
P0455 16839 EVAP Emission Contr.
Sys. (Gross Leak)
Leak Detected Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP
system servicing, carry out tank leak test

P0456 16840 Tank ventilation system
Pin-hole leak detected
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 20;
Fuel supply, gas engine; EVAP canister system components, servicing; tank leak diagnostic, performing.
- Checking fuel supply and ventilation systems for leaks
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
ge 36 of 166 Motronic s
ystem, On Board Dia
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)
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01-36

DTC
Description of malfunction
Corrective action
SAE
VAG


P1127 17535 Long Term Fuel Trim mult., Bank1
System too rich
2) - Carry out road test (Fuel in engine oil)
- Check fuel pressure Page 24
-33
P1128 17536 Long Term Fuel Trim mult., Bank1
System too lean
2) - Check Mass Air Flow (MAF) Sensor Page 24
-59
- Check for unmetered (false) air Page 24
-76
P1129 17537 Long Term Fuel Trim mult., Bank2
System too rich
2) - Check oxygen sensor before catalytic converter Page 24
-81
- Check oxygen sensor behind catalytic converter Page 24
-100
P1130 17538 Long Term Fuel Trim mult., Bank2
System too lean
2) - Check fuel injectors Page 24
-43
P1131 17539 Bank2-Sensor1
Internal Resistance too High
2) - Check oxygen sensor heater Page 24
-114
.
- Check oxygen sensor signal wire and activation Page 24
-122
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 .
Note:
mult. = multiplikative means that the malfunction affects the entire RPM and load range.
Pa
ge 44 of 166 Motronic s
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01-37

DTC
Description of malfunction
Corrective action
SAE
VAG


P1136 17544 Long Term Fuel Trim Add. Fuel,
Bank1
System too Lean
2) - Carry out road test (fuel in engine oil)
P1137 17545 Long Term Fuel Trim Add. Fuel,
Bank1
System too Rich
2) - Check fuel pressure Page 24
-33
P1138 17546 Long Term Fuel Trim Add. Fuel,
Bank2
System too Lean
2) - Check Mass Air Flow (MAF) Sensor Page 24
-59
P1139 17547 Long Term Fuel Trim Add. Fuel,
Bank2
System too Rich
2) - Check oxygen sensor before catalytic converter Page 24
-81
- Check oxygen sensor behind catalytic converter Page 24
-
100

- Check EVAP canister valve 1 Page 24
-134
P1140 17548 Bank2-Sensor2
Internal Resistance too High
2) - Check oxygen sensor heater Page 24
-114
.
- Check oxygen sensor signal wire and activation Page 24
-
122

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
ge 45 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-38

DTC
Description of
malfunction
Corrective action
SAE
VAG


P1147 17555 O2 Control (Bank2)
System too Lean - Check oxygen sensor adaptation values and oxygen sensor control
Page 24
-86

P1148 17556 O2 Control (Bank2)
System too Rich
P1149 17557 O2 Control (Bank1)
Out of Range - Check oxygen sensor adaptation values and oxygen sensor control
Page 24
-86

P1150 17558 O2 Control (Bank2)
Out of Range - Check fuel pressure Page 24
-33
- Check for unmetered (false) air Page 24
-76
Pa
ge 47 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-40

DTC
Description of malfunction
Corrective action
SAE
VAG


P1213 17621 Cyl. 1-Fuel Inj. Circ.
Short to B+
2) - Check fuel injectors Page 24
-39
P1214 17622 Cyl. 2-Fuel Inj. Circ.
Short to B+
2)
P1215 17623 Cyl. 3-Fuel Inj. Circ.
Short to B+ 2)
P1216 17624 Cyl. 4-Fuel Inj. Circ.
Short to B+ 2)
P1217 17625 Cyl. 5-Fuel Inj. Circ.
Short to B+ 2)
P1218 17626 Cyl. 6-Fuel Inj. Circ.
Short to B+ 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
ge 50 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-41

DTC
Description of malfunction
Corrective action
SAE
VAG


P1225 17633 Cyl. 1-Fuel Inj. Circ.
Short to Ground
2) - Check fuel injectors Page 24
-39
P1226 17634 Cyl. 2-Fuel Inj. Circ.
Short to Ground
2)
P1227 17635 Cyl. 3-Fuel Inj. Circ.
Short to Ground 2)
P1228 17636 Cyl. 4-Fuel Inj. Circ.
Short to Ground 2)
P1229 17637 Cyl. 5-Fuel Inj. Circ.
Short to Ground 2)
P1230 17638 Cyl. 6-Fuel Inj. Circ.
Short to Ground 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
ge 51 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-42

DTC
Description of malfunction
Corrective action
SAE
VAG


P1237 17645 Cyl. 1-Fuel Inj. Circ.
Open Circ.
2) - Check fuel injectors Page 24
-39
P1238 17646 Cyl. 2-Fuel Inj. Circ.
Open Circ.
2)
P1239 17647 Cyl. 3-Fuel Inj. Circ.
Open Circ. 2)
P1240 17648 Cyl. 4-Fuel Inj. Circ.
Open Circ. 2)
P1241 17649 Cyl. 5-Fuel Inj. Circ.
Open Circ. 2)
P1242 17650 Cyl. 6-Fuel Inj. Circ.
Open Circ. 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
ge 52 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-43

DTC
Description of malfunction
Corrective action
SAE
VAG


P1250 17658 Fuel Level
Too Low
4)
Repair Manual, Electrical Equipment, Repair Group 01
- Fill fuel tank and erase DTC memory
- Check DTC memory from instrument cluster.
4) The malfunction "Fuel Level too Low" will be stored if the fuel level in the tank is or was too low. The malfunction remains as
a static malfunction and will not be set a sporadic malfunction even if the customer fills the tank with fuel in the meantime.
Therefore it is possible to recognize malfunctions which have been stored due to lack of fuel e.g.: misfiring or malfunction
regarding oxygen sensor control.
Pa
ge 53 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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e=re
pair&id=AUDI.B5.FU04.01.1