Read the ten questions here; they will give you useful information that will help your mechanic diagnose the problem quickly. Mechanicbase is a blog created for all car and automotive lovers. For example, a sensor or actuator may detect a misfire, poor fuel injection, unusual output voltage to the secondary ignition system, erratic operation of the fuel pump, or any other condition that might affect engine performance or emissions. I work as a car diagnostic technician, and in this article, I will teach you what the check engine light is and how to fix it the fastest and cheapest way. Background lighting sould illuminate, speedometer needle should sweep its full range and indicator lamps (battery, security, low fuel, check engine and cruise) should illuminate. You can find MAF cleaning sprays at local auto parts stores if you need one. So I replaced the plugs and the ignition coils plus changed the oil and filter. Does your car start idling rough when you turn on the air conditioner? The fault can be in the fuel or ignition system. How to find the problem with my flashing check engine light? But the light still stayed on. You can buy quality, relatively inexpensive scan tools at most auto parts stores or online. They scanned it again and it’s saying there’s random misfiring now. Scanner shows code po172. Dan Ferrell (author) on February 23, 2019: Download the trouble codes from the computer and see what it tells you. Question: Can you explain what P0300 and P0507 mean? Raw fuel to the Catalytic converter? Let's say, for example, that the oxygen sensor in the exhaust system detects too much oxygen in the exhaust stream and sends this information to the computer. Take a look under the hood for loose wires or vacuum hoses. A flashing check engine light means that you need to pull over immediately as your vehicle has a serious issue that could cause severe engine damage. I can slow down and the car will jump into the next gear though. However, after 3 – 4 days of driving it reappears again. Why would CEL go off and car drive fine after a minute? This could be an issue with the test connector or the computer itself. My opel astra 1998 model was didn't start no spark. The check engine light will flash if raw fuel is getting to the catalytic converter to warn you that it can seriously damage it. Usually when the CEL comes on in a situation like this is to tell you that the engine is in safe-limp mode to prevent damage. Answer: The check engine light is flashing because the catalytic converter could be damaged. She does stand a good chance of doing expensive damage even to the engine. My check engine light flashes when i try to accelerate faster and when you go up hills???? Hope this helps. Usually, this originates in a misfire that allows fuel to pass into the exhaust manifold and down to the catalytic converter where high temperatures ignite the fuel. Next, you'll see a "0" or a "1" digit: A "0" means you are dealing with a generic OBD code found in most vehicles; a "1" means you have a code specific to your car make and model, better known as a manufacturer specific code. This could be a simple loose wire or faulty motor. ... but if it was an intermittent failure the light should go off after three days or three complete drive cycles. Retrieving codes from a second generation OBD system requires the use of a scan tool. Every cylinder in your engine is supposed to play its part or fire to pass the mixture of fuel and air in the system. Scan the computer memory for trouble codes (DTCs). Usually, when the CEL flashes it means trouble for the catalytic converter. Step 1 – Examine the check engine light on the dash Turn on the ignition, and then check if the check engine light (CEL) is steady or flashing. This is the only real problem: Thinking the seal on the gas cap was causing the check engine light to come on, I cleaned the rubber cap seal and the metal receiver with Armor-All. If you notice the check engine light flashing when you are out and driving, you should drive the shortest way to a mechanic workshop to let them take a look before you keep driving. The car was driving fine though (4 hour drive on the way to the shop). Do you know how to do that? For example, does it happen when you accelerating, driving on the highway or does it appear at low speeds? Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. This will help your mechanic evaluate the issue. Eveytime i start my 2001 audi a8 the engine light will start flash and then stop but this time i was driving and the car died on me i change the camshaft sensor/fuel pump and the crankshaft senson and still nothing any ideas? The trouble code, if the problem is still there, will come back on. Answer: If you haven't found any diagnostic trouble codes, the problem can be with a grounded light circuit. You can do it yourself at home with a scanner. I had to drive it home from Charlotte, NC to Atlanta, GA and now problems with the car or engine temp… Any recommendations on what to do next? Do you have any idea what the problem could be? If the battery cable is loose will it make a knock sensor show up bad and make the check engine light come on? The primary culprit that makes your check engine light blinking and car shaking is a malfunctioning cylinder. Have a 2002 Hyundai Elantra car have been having problems with suddenly shaking then stopping and now has a sulfur smell idles rough and check engine light is blinking? A flashing check engine light is your Honda Odyssey’s way of saying “I have a serious problem, don’t ignore me”. Or by stopping at the signal light point. Also, you'll erase your radio and alarm settings. If you can, check the pre-catalytic O2 sensor and the post O2 sensor. × Help us help you. If so, check these common sources of trouble. Go figure. Machine read: Cylinder no. The computer tries to rectify by injecting more fuel into the engine. If you have any other questions about a flashing check engine light or want to share your story of how you fixed it, please comment below. Any ideas of what it could be? I have replaced the ignition coil module on cyclinder 2 & the throttle position sensor. How much you have to drive for the cycle to complete changes from model to model. What else could it be? Sometimes a misfire may feel like a vibration. It’s never recommended to drive with a flashing check engine light. Make sure there are no air leaks - air ducts properly sealed after replacing the MAF sensor, perhaps, triggering the O2 sensor to report a bad ratio. My CEL has been lit for a long time. What does it mean? jennifer anne grimmond on February 25, 2019: My engine light came on last week. A flashing CEL is something to be worried about, it signals raw fuel going to the cat and that could destroy it. The first is usually caused by low tire pressure, the second by a failure of the tire pressure monitoring system. They'll do it for free. Otherwise, you'll start replacing good components without actually fixing the problem. Dealership has checked for codes and there are not any. Hello I would like to know how I can fix my car I have a 2009 Lexus es350 and it has about 156,000 miles and today I was driving over 100 and on the freeway and I was also turning them the check engine light came on and check vsc light too then shortly after the check engine light was flashing and the car started to become weaker and I think it’s a misfire . Question: About a couple of months ago my check engine light was on, and it was due to engine misfiring on all four cylinders. I've had spark plugs, timming belt ,radiator ect fixed when my timming belt went recently got a new battery and fullpump put in .car starts fine but today the engine light is flashing and losing power can it be the starter motor. Did this for about a minute or so, then the light went out and accelerated fine. Once in awhile light goes off for a day then comes back on. If it/they failed, the ECM detected the fault and it may cause all bunch of lights to go crazy. So you need to troubleshoot the oxygen sensor to verify that in fact the sensor has failed. Sometimes those parameters are violated which will cause the engine computer to set a check engine code and light on the dash. When your engine is misfiring, it is dumping raw fuel into the exhaust. It the problem was intermittent at first, may there was a pending code stored, and the computer waited for the next test cycle. Also, other faults can set this code (lean-condition): a faulty MAF sensor, a vacuum leak, bad fuel system pressure, or a leaking fuel injector. When the engine light is lit up, and the engine control unit recognizes a problem with the engine, the engine control unit will store a trouble code in the memory. Put oil in the car and the engine started to shudder. The engine light blinking is telling you a serious problem is affecting the catalytic converter and may cause damage. i already change the coil and the spark plug but the code still appear the same, is there any possibility the fuel injectors went bad? The flashing glow plug light is a "fix me RIGHT NOW" check engine light... have you had it re-scanned for codes, with a VW-specific scanner like VCDS, since it started to flash the glow plug light as you? Dan Ferrell (author) on September 28, 2018: Make sure to have both the computer and switch diagnosed. Thanks. The emission control system contains an array of sensors that work to reduce the amount of pollution released into the air. This may show up in vehicles with electronic throttle control or a related sensor(s). Engine Oil Pressure Light – Causes & Solutions, Will the Check Engine Light Reset Itself After the…, How to Reset Check Engine Light - 5 Simple Methods, Check VSC System Light - What does it mean? Answer: You need to download trouble codes from the computer memory. If voltages out of normal parameters are sent to the computer from this sensor, a trouble code P0462 is set. For example, does it happen when you accelerating, driving on the highway or does it appear at low speeds? Dan Ferrell writes about do-it-yourself car maintenance and repair. Sometimes leaving the gas cap loose will trigger the light on. When the computer detects an abnormal condition, it will store a DTC in memory and turn on the check engine light to let you know of the situation. Hope this helps. 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