1999 SAAB 9-5 obd code p1640

Question

Please let me know what repair I need to make.

Answer 1

Hi there

P1640 SAAB - Engine Control Relay No Voltage to ECM

Read more: https://www.autocodes.com/p1640_saab.html

Basically this means there is a problem with the relay or the fuse that powers up the relay. You could also have a wiring problem to the relay or to the computer on the car.