Today my Volvo S70's Check Engine light came on as well as the Mode "W" engaged light is on and flashing. The "W" warning light says that it is my Automatic Gearbox..What is that? Can I still drive my car?
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it is telling you that there is a fault reported that if not attended to will damage the engine or transmission. So check the coolant level at the radiator cap, check all oil levels check for overheating. Have the fault codes read asap as ignoring the light could lead to very expensive repairs.
It is probably due to a faulty sensor somewhere, but without proper diagnostic equipment it is virtually impossible to tell which one.
A modern fuel injected engine will have sensors to monitor throttle position, manifold pressure, coolant temperature, air temperature, crank speed, camshaft position, exhaust gas oxygen, pre-ignition, etc, etc, etc.
Diagnostic equipment will be able to read the fault code from the vehicles computer and tell you where the fault lies.
The light cannot be reset manually. It will go out once the fault has been rectified.
If the air pump system is setting a fault, then the check valve is probably bad. If it is not addressed, eventually exhaust gases can run back through the air hose to the air filter housing and destroy the MAF sensor, causing these types of problems.
The fuel pump also fails and is a more likely cause of the stalling, and it wont set a code.
Most check engine light faults are related to a vacuum leak in the system. It could be as simple as a loose gas cap. In my case, and the majority of other S70's, there is a small vacuum hose elbow, located out of sight from the engine manifold and behind the engine thermostat housing, that has deteriorated and is most likely setting the code in your vehicle for a fault. It is not easy to get to and will take some effort to replace. You can go to Autozone and they can read the code for you to see if you're going in the right direction. If it is a gross vacuum leak as determened by the code, then look a the rubber elbows/hoses in the charcoal vapor canistor vacuum circuit. Check out some of the forums such as Mathews or Bay13 for technical inof on the actual repairs.