The Check Engine light of my Saturn LS1 illuminated when I was driving my car to work. I had to pull over, and park my vehicle on the shoulder. I tried to turn on my vehicle, but it kept on misfiring. I've never experienced this before. What should I check first?

Your ignition module or coil must have failed. The module is responsible for controlling the timing of the spark plugs by opening or closing the ignition coil ground circuit. This part has a great effect on the overall performance of your vehicle that's why it should always be in good condition. If you recently experienced frequent overheating, then the module is indeed damaged. However, it is better to bring your vehicle to the technician for expert advice before you rule out that the module is causing the problem. They would need to run a few tests to diagnose that the module has failed. Have it replaced immediately when it is confirmed.

One morning I noticed that there is a puddle of water underneath the passenger side of my Saturn LS1. I haven't driven my car in a week, and upon checking, the reservoir bottle is empty. What could be broken or damaged in my vehicle? I hope it's not the head gasket.

If there is no white smoke coming from your tailpipe, then it's not the head gasket. The leak is caused by a cracked or loose hose or water pump. When this happens, it is important that you figure out where exactly the leak is coming from. Check your radiator for leaks or signs of damage. Have it fixed if you found any holes or cracks. Over time, corrosion eats up the internal components of your vehicle, causing these leaks. Make sure to conduct a visual inspection of your vehicle as often as you can.

Last night, I was driving my car, and then suddenly, it loses its power and shakes. I got really scared; good thing I was able to drive it towards the emergency bay. The next thing I know, the codes P0300 and P0420 showed up. What's going on with my vehicle?

The P0300 is a generic code for misfiring, while the P0420 is for exhaust gas recirculation (EGR). This is an emission device that cuts down nitrogen oxide (NOx) to minimize air pollution. A failed EGR can cause drivability problems, such as detonation, stalling, hard starting, and worse, elevated NOx emissions. When this happens, it is important to have your car towed to the nearest repair shop and have it checked.

My vehicle would crank, but it won't turn over. I replaced the ignition coil, and even changed the spark plug boots. Should I also change my crankshaft position sensor?

Check the engine control module (ECM) if it has signs of damage or wear and tear. Your battery might also be weak. If all else fails, then you should change your sensor. This is usually the cause of failure to turn over in Saturn vehicles.

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