200 Fault diagnosis
Diagnostic trouble codes P1170 P1171, P1172 {contd.)
5
5 Check
• fuel pressure and flow
• that the EVAP canister purge valve closes when no
current is applied to it
• that there is no air leakage in the exhaust system
· ahead of the front heated oxygen sensor or its
mounting
Is there a relevant cause of the fault?
I YES
I
Rectify the fault and proceed to point 6.
I NO I
Change the front heated oxygen sensor and
continue with point 6.
Saab 9000
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