Service engine soon light stays on after repairs

rWhen my service engine light came on I replaced the catalytic converter,replaced spark plugs ,wires,ignition coils wires.as I take off it takes a while for the car to kick into gear once it takes off its ok

My car has 127000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
If the light is still on, then it may still have a problem that is still there. I recommend having the ECM scanned and the codes received should be diagnosed. The code may be the only tool for an accurate diagnosis of a specific issue and not simply a code to simply replace the part that it is identifying as faulty. With that being said, I’d recommend seeking the help from a certified mechanic who has the utility to diagnose your service light accurately.

How to Identify and Fix Common car Problems ?

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The Light Stays On

If you`re experiencing this, don`t panic. You may think that there is still a problem with the car after the repair, but it`s because the light needs time to reset. The car`s internal computer only resets after a set period where it checks all of its sensors once more.

The most common reasons a Mitsubishi Outlander has a check engine light are an emissions system component, a sensor, or a catalytic converter.
Press and hold the INFO button for two seconds and release it when the service symbol starts flashing. Press the INFO button again and you`ll see CLEAR text on the information screen. Start your car and you`ll see the service engine soon light has been reset.
In most cases, successfully repairing the issue that caused your light to come on will cause the check engine light to turn off automatically—but only after 10 to 20 “cycles”. A cycle, in this instance, refers to the process of turning the vehicle on, running it for some time, and turning it off again.
The reasons for a check engine light turning on can range from something minor like a loose gas cap to something more serious like a faulty catalytic converter. It could even be a sign of internal engine failure. Ignoring the problem can turn a potentially quick fix into a costly and time-consuming repair.
This means that more than one problem could be causing your check engine light to illuminate. Perhaps the technician replaced your oxygen sensor, but your engine also needs some spark plugs to be replaced. The best course of action here is to take your car to the technician again to see what else needs to be done.
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.
1. Your Car Needs an Oil Change. An illuminated check engine light is the first warning sign that your vehicle needs an oil change. It can activate because the oil is too dirty or when there`s not enough flowing throughout the engine.
Most Mitsubishi vehicles are equipped with an electronic computer system that is linked to the dashboard. This system triggers a wrench-shaped dashboard symbol, which tells drivers when routine maintenance or an inspection is required. The driver must respond to the issue as soon as possible and resolve it.
However, failing to clear a code after a repair could leave you second-guessing the issue or doubling your work to recheck the codes. That`s why you should always make clearing codes an essential part of your repair process.
To reset a check engine light without a scanner, disconnect the negative battery cable and wait a few moments. This will reset the diagnostic system in your vehicle, and if the underlying issue has indeed been resolved, the light should go off immediately.
The emissions/exhaust system is the most likely culprit for many check engine lights being illuminated. There could be an exhaust leak or a problem with the catalytic converter. The mass airflow sensor (MAF) is another sensor that is easily tripped or can fail.
Can you drive a car with the engine light on? It`s okay to drive for a few miles, but be sure to schedule an inspection of the engine as soon as possible. If the check engine light comes on while you`re driving, don`t panic! Pay attention and see if the car is driving any differently than normal.
These problems can range from faults within the electrical system, the engine, fluid levels or to problems within the car`s emissions system. The problem can even be as simple as forgetting to tighten your gas cap – in fact, this is the most common reason why check engine lights appear in the first place.
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.
Normally once your car is taken for service, the mechanics can get that light to deactivate. This can happen automatically if all the issues they diagnosed were resolved. Or they can turn it off manually. If there are no issues with the car left, if the engine light is deactivated manually, it will not reactivate.
Once you see the check engine light, it is safe to drive with the light on for 50 to 100 miles. This is because if the issue is with the sensors, then this will buy some time for it to reset, turning the check engine light off. However, scan the computer for the appropriate error codes if the light remains.
However, failing to clear a code after a repair could leave you second-guessing the issue or doubling your work to recheck the codes. That`s why you should always make clearing codes an essential part of your repair process.
The check engine light may stay on steadily or it may flash when the vehicle is accelerated. This is very serious. There is a severe failure of the emission control system that is causing the engine to misfire to the point that the catalytic converter is damaged each time the check engine light flashes.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

While driving on freeway truck goes into a limp mode, and the check engine light, abs light, parking break light, service brake
ANSWER : It is possible that you could be having an issue with your powertrain control module. This is somewhat of a common problem on many GM vehicles. I would recommend having your vehicle inspected by the dealership to determine if the powertrain control module is functioning properly. If not, a reflash of the powertrain control module may resolve the issue but often times it must be replaced.

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.

Battery light goes on when I start car then turns off, if I rev engine light comes back until rpms go down. Abs goes comes on/off
ANSWER : Batteries can die due to faults in the charging system so ideally a suspected "faulty" battery should be load tested before a decision is made to condemn it. The only exception to this rule is if the battery is already clearly "old" (greater than 5 years) but even then once you put a new battery in, as a replacement for a "dead" battery, you have to comprehensively check out the charging system. Diagnostic Trouble Code P0460 will result in disruption of the dashboard fuel gauge’s ability to accurately report your tank’s fuel levels. The fuel gauge readings may be erratic, or read somewhere off scale. Vehicles equipped with a low fuel warning light feature may also suffer from erratic low fuel warnings in the event of a code P0460. Unless the P0460 code has been reported alongside other trouble code, all of the vehicle’s essential systems should otherwise function normally. I would recommend that you request a check engine light diagnostic to first resolve the fault causing the P0460 code to set. The check gas cap light warning light could be due a faulty gas cap and/or small leaks in the EVAP system.

2012 equinox reduced power light engine light and traction light came on. Lost a lot of power got home and all light except engine
ANSWER : Your car has what is called a "safe mode" that will be engaged by the computer when it detects that something critical has gone wrong related to any of the major components in your engine chassis or power train. This may be related to a number of things, most of which should have been registered in the computer when the check engine light came on. I recommend having an expert from YourMechanic come to your location to inspect your check engine light and diagnose any codes registered by your vehicle’s computer.

Abs light, emergency brake light, steering wheel assist light, engine light, EPC light, traction control light
ANSWER : Hello, thank you for writing in. The vehicle does utilize a lot of the same sensors for these systems. Are there any other codes that are coming up when this code appears? If so you will want to take these into consideration when processing the repair and making a diagnosis. The module may be bad, and replacing it should fix the problem. The lights should turn off once the main computer recognizes the new module and the sensors sync up. If you believe the sensors need to be cleaned you may do so. Do as minimal as possible to make sure you are not damaging the sensor or disrupting the wiring inside. A bad connection would make the lights stay on. With so many lights that are effected by the module being illuminated, the module is likely bad or does not have a connection. Check the connection first and then resort to replacing the unit. For more help with these electrical tests, contact our service department.

ABS light on, ESP light on,Traction OFF light on, engine light on, rides perfectly OBDI reads only Front Right Wheel Speed Sensor
ANSWER : If a faulty component is still in place, the fault codes will return almost immediately after clearing them. ABS, ESP, and traction control systems all rely on input from wheel speed sensors to determine as the name implies, the speed of each wheel. When a wheel, or wheels are spinning faster than others due to wheel slip or the vehicle is sliding, the ABS and ESP systems can reduce throttle input as well as apply braking to an individual wheel or all of them if needed. With a wheel speed sensor fault code stored, these systems cannot determine the rate that all 4 wheels are spinning and sets a fault. That is why the abs/esp light is on. The system should be scanned by a certified technician and the wheel speed sensor replaced if found to be the cause. The warning lights will stay on and these systems will not function as designed until the fault is corrected. These lights do not come on to indicate a need for routine service. Rather they only come on when a component in the system is at fault.

After i replace my whole fuel pump will that solve battery and security and oil light and. Check engine service light problem
ANSWER : If a faulty fuel pump caused the engine to abruptly stop, you might see a variety of warning lights. Once the engine is running again, the lights may go out but ONLY if the warning lights were related to the fuel pump failing. For example, if the oil pressure warning light was on while the engine was still running, it likely that that light will remain on even after installing a new fuel pump. Of course, if the oil pressure warning light does comes on, stop the engine immediately to avoid damage. Without downloading the diagnostic trouble codes that have caused the check engine light to come on, it is hard to say if the check engine light will turn off after the pump is replaced because the codes that have set (causing the light to come on) may pertain to the fuel pump but could pertain to other issues, as well. So, this cannot be answered without downloading those codes.

Of course, if your car is not running be sure that you very carefully diagnose the cause because you don’t want to end up needlessly replacing the fuel pump when indeed the actual problem lies elsewhere including perhaps just a bad electrical connection to the fuel pump if you are seeing no pump operation. Given what you are describing, I recommend that you request a no start diagnostic and the responding certified mechanic will determine if you actually need a fuel pump and, as well, let you know why the warning lights are on and what repairs, if any, are needed. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Service engine light only in warm weather
ANSWER : Hello. Typically the service light is a vague warning and can indicate something as simple as too many miles between oil changes to potentially serious faults in the engine. The problem could be totally benign or very serious, and a professional inspection is the best course of action if the light is persistently illuminated. It’s not uncommon for extreme cold to disable some error codes, however if it comes back as you’ve described, it is possible that the catalytic converter may be the source of the error code. The best way to determine this is to have a professional mobile mechanic complete a service light is on inspection.