1. Low oil pressure: This is a serious issue that can cause major engine damage if not addressed immediately. Check your oil level and add oil if necessary. If the oil level is full, you may have a problem with your oil pump or oil pressure sensor.
2. Engine coolant temperature too high: This can also be a serious problem, as it can lead to engine overheating. Check your coolant level and add coolant if necessary. If the coolant level is full, you may have a problem with your thermostat or water pump.
3. Check engine light: This light can come on for a variety of reasons, many of which are not serious. However, it's always best to have your car diagnosed by a qualified mechanic if the check engine light comes on.
4. Loss of communication with the engine control module (ECM): This is a rare but serious problem that can prevent your engine from running properly. If you suspect that you may have a problem with your ECM, have your car diagnosed by a qualified mechanic immediately.
5. Bad gas: In rare cases, bad gas can cause your red engine light to come on. If you think you may have put bad gas in your car, try adding a fuel system cleaner to your gas tank and see if that fixes the problem.
If you're not sure what's causing your Saab's red engine light to come on, it's best to have your car diagnosed by a qualified mechanic.