Car shaking and check engine light blinking

Hi my names Mark. I just bought this car without having a mechanic fully diagnose the car so I pretty much rolled the dice on this purchase. She told me to change the egr valve so the check engine light can turn off. But after replacing it, it's still on and now it's blinking. So at this point it's shaking and the engine light keeps blinking. Now here comes the million dollar question, what can I do to get this thing fixed without burning a hole in my wallet?

My car has 238100 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi Mark,
There are a few things that can cause the shaking and engine light to come on. Generally, this happens when there is a misfire due to a spark problem or an over or under fueling problem. Things like spark plugs, spark plug wires, ignition coils, clogged fuel injectors, a dirty mass air flow sensor are a few things that can cause this to happen. I would suggest having an expert from YourMechanic come to your location to take a look at your Jaguar to determine what may be causing the check engine light to remain on and the shaking problem.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Faulty spark plugs and ignition coils are the most common reason for a running rough engine that causes shaking and a flashing check engine light. The shaking is usually from a misfire, and it`s common for the check engine light to flash for ignition-related codes. You might also notice a reduction in power.
A blinking check engine light will show up on your dashboard is almost always correlated with engine misfires. A misfire means that the engine is dumping uncombusted fuel into your car`s exhaust system. Engine misfire is a serious issue because it can quickly raise the temperature of the catalytic converter.
If the check engine light in your Jaguar starts flashing, that means that the problem needs fast attention and your Jaguar should be brought in immediately. A flashing light indicates that the problem is impressive and if not taken care of immediately may result in big damage to the vehicle.
If the check engine light in your Jeep Grand Cherokee starts blinking, that means that the problem needs immediate attention and your Jeep should be brought in quickly. This blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system.
One of the most common causes of engine vibration is faulty spark plugs. If your spark plugs are worn out or dirty, it can cause your car`s engine to misfire. Sometimes, it might not even fire on every cylinder or create the spark your engine needs to ignite the fuel.
Worn out spark plugs are one of the most common causes of engine shaking. If your spark plugs are dirty or worn out they will be unable to fire properly and create the spark your engine needs to ignite the fuel. This causes your engine to misfire. Replacing your spark plugs is typically inexpensive.
If the check engine light is steady, set an appointment with your mechanic for a checkup. If the check engine light is blinking, get it to your mechanic as soon as you can. If you drive it, go slowly and if anything changes with your gauges or the performance of the vehicle, pull over and call for a tow.
There is no set time limit, as the severity of the problem can vary. However, it is generally not advisable to drive for more than a few miles with a flashing check engine light. If possible, have the vehicle towed to a repair facility rather than driving it so that you do not put yourself or others at risk.
A faulty alternator not only turns the check engine light on, it also risks your safety. If the alternator fails when you`re driving, the car radio will go off, the interior lights will dim, and you will experience extreme difficulty in driving. The reason being all power is lost.
The death wobble is caused by loose, damaged, or misaligned parts in your Jeep`s suspension or steering system. Due to the mechanical defect in your car, the parts can shake loudly or violently when you travel at high rates of speed or on rough terrain.
Jeep Cherokee Shakes When Accelerating

One possibility is that your engine mounts are worn out or damaged. Engine mounts keep your engine in place, and if they`re not functioning properly, it can cause your engine to shake. Another possibility is that your transmission is slipping.

One of the most common reasons a Jeep Cherokee will shake while driving is that the tires are worn out or unbalanced. A tire with a knot or worn place can make it seem like your Jeep is going to vibrate off of the road as you are traveling.
Improperly functioning spark plugs cause an uneven burn of fuel in the engine, resulting in fluctuating RPMs and a louder noise. You might also experience increased vibrations of your vehicle while sitting idle or while traveling at low speeds. These vibrations originate from the engine and can shake the entire car.
Misfires don`t simply go away – they need to be addressed immediately. Even if they don`t get worse, they certainly won`t get any better unless you take the car to a mechanic.
If left untreated, a cylinder misfire can lead to significant engine damage. Worse, if you experience a bad misfire while driving, it could result in an accident. This is why it`s important to treat engine misfires as soon as you detect them.
A clogged or failed exhaust gas recirculation or crankcase ventilation valve or faulty oxygen sensor can send the wrong signals to the computer and cause misfires.
Yes. While the damage may seem small initially, the longer you drive with a bad oxygen sensor, the worse the damage will become. Eventually, you may experience rough idling, poor acceleration, engine misfires, an illuminated check engine light, and failed emission tests.
Dirty or Old Spark Plugs

If your engine is misfiring, you may be able to fix the problem easily by replacing your spark plugs. Spark plugs are relatively easy to remove from engines and inspect for damage, and at less than $25 a piece, they are relatively cheap to replace, too.

The problem is that a flashing check engine light means you have a catalytic converter damaging misfire. This could mean you have one cylinder that just isn`t firing at all or every cylinder is missing a lot.
The most common descriptions of an engine misfire are a sound like a popping, sneezing, banging, chuffing, or a backfire, usually when the engine is anywhere between 1,500 – 2,500 rpm.
A loose gas cap is one of the most common reasons for the check engine light to go on. Check that your gas cap is screwed on securely and that it`s in good condition. If you have a tank of bad gas in the car, your check engine light may come on.
Reasons for Flashing Check Engine Light

Problematic Catalytic Converter: A common cause of blinking engine light is an issue with the catalytic converter. The device is located at the exhaust system and helps convert poisonous gases into harmless ones.

If the check engine light illuminates, it will either blink or remain constantly illuminated, depending on the problem. A blinking light, or in some cars a red light instead of a yellow or orange light, indicates a problem that needs immediate attention. Either way, you should have the vehicle checked by a mechanic.
The simplest way to describe the difference is that the Service Engine light informs us of upcoming expected maintenance. On the other hand, the Check Engine light informs you of an unexpected problem occurring in your engine or exhaust system.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Was driving on the expressway and my car started shaking, check engine light turned on, oil light turned on and off
ANSWER : Hello, thank you for writing in. Shaking and vibrating typically comes from a misfire, or poor engine performance. A lack of oil will absolutely contribute to these symptoms and amplify them, if not cause them to begin with. You want to turn your attention to the cause of the oil leak. If external (you can see the leaking oil), then you will want to trace the leak to the component which has failed. If the leak is internal (or the engine is consuming oil), the leak will be harder to find. It will also explain the poor engine performance due to excess oil in the combustion chamber. A head gasket is one of the main components that will fail and cause these issues. It is however not common for a vehicle this age to have these kinds of problems. You will also want to scan the computer, and see what codes are triggering your check engine light. These diagnostic tools will help you determine what system(s) is to blame for the malfunction. For more diagnostic help, contact our service department to schedule an appointment.

Check engine light refuses to go off after engine replaced
ANSWER : Hello there, you have a long series of issues going on with your 2013 Hyundai Sonata. If you keep getting a repeating oil light on than there is likely a fault in that system.

Since this fault has lasted after the engine was replaced it could be a oil pressure sensor, wiring harness fault, ECU fault, oil pump, oil strainer clogged, or low oil pressure.

To diagnose this issue properly you need a complete vehicle inspection to start from square one and identify the root cause of all this.

Car started to slow down and then the check engine light, battery, and engine oil light came on. What could cause this?
ANSWER : Hi there. It is possible that the battery cable came loose or the wires to the oil pressure sensor has came loose or failed. Check the battery cables and make sure that the terminals are tight and clean. Check the wires to the oil pressure sensor and make sure that they are connected and not broken. If everything looks good, then the oil pressure sensor may have failed. Plus, check the computer for codes and see what is stored. This will lead you to the part that could have failed. I recommend replacing the oil pressure sensor then checking to see if the lights will go out. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you with the warning lights that came on.

Car won’t start. The check engine light, battery light, and oil change light are coming on. I tried jumping the car and nothing happened. Why won’t my car start?
ANSWER : Hi and thanks for contacting Your Mechanic. If sometimes your vehicle will start with the new alternator and sometimes it won’t, then there is a loose connection in your charging system. Check all of the wires to the alternator and to the battery. Make sure that the battery cables are clean and tight. Make sure that the wires to the starter are clean and tight. A loose ground to the ignition system will cause the vehicle to not crank over. Check all of the ground wires from the battery to the starter. Make sure that they are clean and tight. If you need further assistance troubleshooting your no start situation, then seek out a technician, such as one from Your Mechanic, that can assist you.

Car goes into limp mode when the check engine light and VSA light comes on
ANSWER : The lights that you have on and the vehicle going into fail safe mode is an indication you have a major system failure that will require computer to be tested for codes first. There are many possible codes it can be so the additional testing will be needed to isolate the cause of the problem.

My car shows the Check Engine Light and DPF lights and coil light on the dashboard. What action should I take?
ANSWER : Hi. The EGR valve needs to be replaced and the passages to the EGR need to be cleaned. The EGR location is very tricky to get to so you may need a professional technician (such as one from YourMechanic) who can complete this repair. The diesel particulate filter (DPF) filter should also be replaced and the housing for the filter should be inspected for damage due to the people stealing your filter.

2006 Ford Mustang has check engine light on
ANSWER : There are countless potential causes for your illuminated check engine light. The mechanic manually turned off the light, but it came back on because the problem has not been fixed. The first place to start is retrieval of the stored diagnostic trouble codes (DTCs). These codes serve as a starting point for any further diagnostics a mechanic may perform. Codes will be stored anytime the check engine light is on. Since the first mechanic was unable to fix your concern, I recommend giving the professionals at YourMechanic a call. We offer expert check engine light diagnosis and repair.

While driving on freeway truck goes into a limp mode, and the check engine light, abs light, parking break light, service brake
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