174 Fault diagnosis
Diagn·ostic trouble code P0420 (contd.)
2
2 Check the rear heated oxygen sensor's cable
- Inspect the cable visually for chafing of the in-
sulation or loose contacts in the connector.
Is the cable OK?
I YES I Change the three way catalytic converter
and continue with point 3.
I NO I Rectify the fault and proceed to point 4.
3
3
- :~
CJ
~
__________ ___.!
3 Check the fuel system
- Check the fuel pressure and fuel pump delivery
flow.
All OK?
I YES I Continue with point 4.
I NO I Rectify the fault and then continue with po-
int 4.
Saab9000
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