124 Fault diagnosis
Diagnostic trouble code P0135
Heating, front .heated oxygen sensor
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Symptom of fault
The CHECK ENGINE lamp (MIL) is on.
Conditions
• Heating circuit active
• Heating circuit current below 500 mA or above
2300 mA for 5 seconds.
592Fa
589
µp
µp
28
I
67
H70-1
23
47 67
50
Diagnostic help
• The oxygen sensor's heating circuit current can be
ascertained using an ISAT scan tool.
- Select "READ FUNCTIONS".
- Select "O2S 1 PREHEATING"
With the engine hot, the ISAT scan tool should show
a heating current of 700-1000 mA.
Oxygen sensor heating can be activated by means
of the ISAT scan tool.
- Select "ACTIVATE".
- Select "O2S •2".
If diagnostic trouble codes P0135 and P0141 are
present, the cause
of
the fault is:
- because fuse 28 has blown
- the common power supply for the oxygen sen-
sors from fuse 28 is absent
Saab 9000
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