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Home >> Saab >> 2003 >> 9-3 Vector, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> TRIONIC T7 Fuel Control System >> Fault Diagnosis Fault Codes >> DTC P1390: Random Misfire Detected. Catalyst Damaging. Fuel Level Low. >> Diagnostic help
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Diagnostic help

If any other trouble codes have been generated, check whether fault diagnosis should start with them. Drive the car in the load and engine speed range shown by Freeze Frame. If the engine does not misfire, the trouble code was probably due to the fuel level being too low. Drive the car so that the catalyst diagnosis is performed. If necessary, change the catalytic converter.

If the engine misfires during test driving, conduct a general inspection of connectors and hoses, and then a thorough check of compression, ignition and fuel system.

Functions in the diagnostic tool related to the fault: