Fault diagnosis 173
Diagnostic trouble code P0420 {contd.)
I
*
Diagnostic procedure
1 Check the exhaust system
- Start the engine and run it at idling speed .
- Check the exha·ust system for leakage between
the engine and the rear heated oxygen sensor.
Any leakage? ·
I
YES
I
Rectify the fault and proceed to point 4.
I
NO
I
Continue with point 2.
Saab9000
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