It improves efficiency by directing the hot exhaust gases back into the combustion chamber, which warms up the fuel and makes it easier to combust, resulting in higher gas mileage. The symptoms may sound familiar, as they’re similar to what happens when the plug wires are failing, which is why you need a professional sometimes.Įxhaust gas recirculation (EGR) is a system that cuts down the amount of nitrogen oxide that comes out of your car and helps it run more efficiently. ![]() There are a lot of symptoms that your sensor might be failing, including a rough idle, trouble starting, and unexpected change in the position of the throttle. Failing to replace a mass air flow sensor can cause your car to lose gas mileage – up to 25 percent. Needless to say, you need the sensor to keep your car running and it’s not cheap. You car wouldn’t be able to adjust to changes in altitude and outside conditions without it. The sensor works in collaboration with your oxygen sensor. The mass air flow sensor figures out the barometric pressure, humidity, of the air going into your engine’s combustion system. If you have one or several bad coils causing engine inefficiency, you’re looking at a higher repair bill. Most cars built from the late 1990s and on use one coil per cylinder. That is if you have a car that uses only one coil. Plugs typically range from $20 to $60 each, your ignition coil would cost $30 to $50 or so, and the labor will probably cost the most. If your car stops running or won’t stay running, it might be the plugs/coil, because the plugs aren’t getting enough electricity to ignite the combustion to run the engine. ![]() Both coils and plugs can fail just from the amount of high temperatures they’re exposed to, as well as due to general aging. The ignition coil charges the spark plugs by converting low voltage electricity from the car’s battery into high voltage electricity that can get the plugs going. Your car could start releasing toxic fumes all over the place. However, don’t let the fear of your converter being the problem stop you from getting your car checked out. You should hope, just hope, that this is NOT the problem. Not only does it cost a lot to replace converters, there’s probably another underlying problem that caused it to fail, which will cost more money to fix. Bad exhaust valves, bad spark plugs, and anything that causes the exhaust gases to be the wrong temperature or consistency can make a converter fail. The converter is part of your exhaust system and turns toxic gases into mostly harmless exhaust. Having to replace a converter is one of those things you’re hoping is not the case when that check engine light comes on. We recommend you try tightening it first and then see if the light goes off.Ĭatalytic converters ain’t cheap. A lot of other problems will hit your wallet much harder. You should hope, just hope, that the gas cap is the problem. A messed up gas cap situation accounts for over seven percent of the situations that a check engine light goes on, which is actually quite a bit higher than a lot of other reasons. However, if your gas cap is damaged and needs to be replaced, you’re looking at spending a few bucks. What you do is, get out of your car and tighten it (when the vehicle is stopped). If your gas cap is just loose because you’re negligent, then it shouldn’t cost you anything to tighten it. Besides the obvious reasons that your engine not receiving the correct ratio might be a problem, one of the most serious ramifications of a sensor failure is losing almost half your car’s fuel efficiency (which costs money by itself). ![]() The reason your sensor might fail is because you’ve neglected taking care of your car or from using gas that is high in ethanol. Oxygen sensors fail somewhat frequently, this is why it is the most common reason for your check engine light to go on. When there is too much fuel or too much oxygen going into the engine, the use of this sensor can allow your car’s computer to equalize the issue. ![]() Oxygen sensors essentially check to make sure the ratio of fuel to air is correct.
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