126 Fault diagnosis
Diagnostic trouble code P0135 (contd.)
3 Check the heating circuit ground connection
· and power supply
- Unplug the oxygen sensor's 4-pin connector.
- Start the engine and run it at idling speed.
- Connect the test lamp to:
pin 1 and 8:-
8+ and pin 2
Does the test lamp light up in both cases?
I YES I Change the sensor and continue with
point 4.
I NO I Rectify the lead in question and proceed to
point 4.
Saab9000
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