BOSCH Motronic ECU Fault Codes
This fault code chart shows the Bosch Motronic fault codes for the following systsms:- 1.5, 1.7, 1.8, 2.5, 2.7, 2.8, 2.8.1, 2.8.3, 3.1, MP3.1, 3.2, 4.1, 5.1, 5.1.1, First Generation and MPi.
Bosch Motronic Code Chart
Code:
Item:
Fault:
12
Initiation of diagnosis.
n/a
13
Oxygen sensor
No change in voltage/open circuit.
14
Coolant Temperature Sensor (CTS)
Low voltage
15
High voltage
16
Knock sensor 1
No change in voltage
17
Knock sensor 2
18
Knock control unit
No signal, Engine Control Unit (ECU) fault
19
RPM signal (crankshaft sensor)
Incorrect signal
21
Throttle position sensor
22
23
Knock sensor module
24
Vehicle speed sensor (VSS)
No signal
25
Injector valve 1
26
Injector valve 2
27
Injector valve 3
28
Injector valve 4
Fuel pump relay
29
Injector valve 5
31
Engine RPM signal (crankshaft sensor)
32
Injector valve 6
33
Inlet manifold pressure sensor
Voltage too high
34
Exhaust Gas Re-circulation (EGR) valve
Manifold Absolute Pressure (MAP) sensor
35
Idle Speed Control Valve (ISCV)
Poor or no idle speed control
36
Incorrect RON/Octane setting
Damaged RON plug or bad connection.
37
Engine self-diagnosis (fault code light)
38
Voltage low (1990 model year on)
39
Voltage high (1990 model year on)
41
1 gear ident switch (C20LET systems)
EST Line coil cylinder 2&3 (M2.8/XEV systems)
42
EST Line coil cylinder 2&3 (M2.8 / XEV systems)
43
Linear EGR system (XEV systems)
Faulty
44
Air/fuel mixture too lean (weak)
45
Air/fuel mixture too rich
46
Air pump relay
47
Linear EGR Position (XEV systems)
48
Battery voltage
49
51
ECU Programmable memory
PROM error, hardware failure
52
Engine check light; final stage (fault code light)
53
54
55
Engine Control Unit (ECU) fault
Renew Engine Control Unit (ECU)
56
Short to earth
57
Interruption
59
Inlet manifold valve 1
61
Fuel Tank Vent Valve (FTVV)
62
63
64
EST Line coil cylinder 1&4 (M2.8 / XEV systems)
65
Carbon Monoxide (CO) potentiometer
66
67
Throttle valve switch - idle position switch
Low voltage - switch not opening
68
Throttle Switch (TS) - idle contact
Idle switch not opening
69
Air Temperature Sensor (ATS)
71
72
Throttle Switch (TS) - full load contact
High voltage - Full load switch not running
73
Air Flow Sensor (AFS)
74
75
Transmission switch - torque control
76
Automatic Transmission (AT) torque control
Engaged long, ignition retard long
79
Traction control unit
Incorrect ignition/injector cut-off
81
82
83
84
85
86
87
Air Conditioning (AC) cut off relay
88
89
Oxygen sensor heater
91
92
Camshaft sensor failure (XEV systems)
93
Hall Effect Switch (HES)
94
95
Hot start valve
96
97
Traction control unit - ignition/injection cut off
Incorrect signal - high voltage
98
Open circuit, wiring break
99
Code unknown
113
Turbo boost control
Boost presure high, out of range
114
Idle boost valve
Above upper limit
115
Full boost pressure
Below lower limit
116
Boost pressure
117
Wastegate valve
118
121
Oxygen sensor 2
Lean exhaust, weak mixture
122
Rich mixture/exhaust
123
Blocked
124
Inlet manifold valve 2
132
133
Exhaust Gas Re-circulation (EGR) valve 2
134
135
'Check engine' lamp (fault code lamp)
136
Engine Control Unit (ECU)
137
Engine Control Unit (ECU) box
High temperature
141
Secondary air pump
Not enough air
142
Air without pump
143
...
EGK69