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Originally Posted by JohnENC
New here, got occasional dashboard warning lights for "PSM OFF" and "BRAKES" on my 2002 986 S. My cheap OBD II scanner didn't find any fault codes, even with those two dash lights illuminated. Any recommendations on how to read the fault that is triggering those lights? Brake pedal feels normal, plenty of brake fluid. Looking to avoid the 90 minute drive to the dealership and small fortune it would cost.
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I would load test the battery; many times you see these codes (ABS/PSM) are related to weak batteries. And as for your global OBD II tool, there are more things that it cannot see on these cars than what it can. If you are going to work on it yourself, you need to have a Porsche specific scan tool like the Durametric system.
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