How can I reset the computer

How can I reset the computer

My car has 150000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Unhooking the battery and jumping the positive and negative terminals should clear any trouble codes. Be sure to unhook both as this can be very dangerous if not done properly.

If not experienced in doing this, I would recommend having an expert clear the trouble codes for you.

How to Identify and Fix Common car Problems ?

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Disconnecting your battery and draining the power to cause an ECU reset is one of the most common fixes for a check engine light that won`t go away on its own. Doing so is equivalent to a hard reboot on a desktop computer, which is a standard way to eliminate many common problems.
3) Disconnect the Battery then Reconnect

Ideally, this will clear the data, turning off the light. You can then reconnect the battery and turn the ignition on. After about a minute, the check engine light code should be off.

It is a good idea to let your car sit with the battery disconnected for at least half an hour, this will reset the computer allowing your O2 sensors to not have to work against the PCM.
What happens when you reset an ECU? By resetting the Engine Control Module, you can return your car to its factory settings. This will erase any error codes or radio stations that were stored in the car`s memory.
Why you need to reset the computer: Your car`s computer—the ECU—reads data from your vehicle while it`s in operation, and a battery replacement disrupts this process. It needs a chance to clear error codes after a new battery is connected.
When a battery is faulty or undercharged, it won`t be able to send the right amount of energy to your vehicle`s computer. This may cause the check engine light to flip on. If you drive a newer model car, you may also have a handy battery warning light on your dashboard.
MALFUNCTIONING AND FAILED SENSORS Oxygen sensors can fail when the sensor`s ceramic element is exposed to certain types of silicone compounds or when an oil-burning engine leads to the sensor becoming oil-fouled. Also, a small amount of tetra-ethyl lead in the gasoline can kill an oxygen sensor.
Disconnect both O2 sensors (front and rear). Start the engine and allow the vehicle to idle. After faults have stored: Cycle the ignition OFF/ON 2 times with a 10 second pause in between key cycles.
The principle of BMS reset is to restore the battery management system to the default settings. A BMS is designed to monitor and control the charging and discharging of a battery to keep it operating within safe parameters and extend its lifetime.
The service “ECU reset” is used to restart the control unit (ECU). Depending on the control unit hardware and implementation, different forms of reset can be used: “Hard Reset” simulates a shutdown of the power supply. “key off on Reset” simulates the drain and turn on the ignition with the key.
You plug an OBD-II scanner tool into it and, in most cases, out pops a code that tells you what the problem is. The scanner also allows you to clear the vehicle`s internal code, which is what triggered the check-engine light. Do that, and the warning light will turn off.
ECU re-programming is not required because most repairs are done on the hardware parts and not on the software programming. Therefore, the programming of the ECU will never be altered.
The Primary purpose of OBD Scanner is to provide data on Performance checks on the car – using data from engine and transmission and finding in faults. However – resetting ECU is not something which OBD Scanners are capable of.
Here`s something you probably don`t know: after clearing the car`s computer you will need to drive for about 50 to 100 miles. As you drive your car the computer will monitor all the sensors and register the results.
If you disconnect the positive terminal first, one slip of your wrench could send a direct short to the ground, which can be very dangerous. Its possible that you could experience a huge spark, the wrench could melt in your hand or the battery could even explode!
Disconnect Battery Cables

Your job is to disconnect both. However, DO NOT disconnect the positive terminal before the negative one. Doing so can cause an electrical short. Always disconnect the negative battery terminal first.

Connecting the negative terminal first can create a short circuit, potentially damaging the battery, and electrical system, or even causing injury. By connecting the positive terminal first and then the negative, you can minimize the risk of any accidents or damage, ensuring a safe and successful installation.
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.
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.
A weak battery that may appear to have a good state of charge and crank the engine, but it can cause issues with the vehicle`s networks including codes for loss of communication.
If there were a problem with the battery that effected the engine management system, there would be more than one code stored. Including one that indicated that the battery was disconnected. And the charging system warning light would also come on. So that code P0420 is real.
Oxygen sensor failure can often be traced to one of three common factors: Age and high mileage, an internal contaminant (poisoning) or an electrical issue. One or two wire unheated oxygen sensors should be inspected or replaced every 30,000 miles.
It is a good idea to let your car sit with the battery disconnected for at least half an hour, this will reset the computer allowing your O2 sensors to not have to work against the PCM.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Airbags were deployed. All airbags and damage have been replaced. How do I reset the computer? 2017 BMW X3
ANSWER : Hello – this problem requires a full-function, BMW specific problem scanner and reset tool. This is usually only available at a BMW dealer. I would expect to be charged for an inspection fee as well as the code reset function. This is mandated by BMW corporate to ensure that a vehicle is properly repaired after a collision, and that all systems will work properly in a subsequent crash. This is for your own safety. I would check with your local BMW dealer or BMW service center for this task.

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Can resetting 2014 Chevy captiva computer stop the reduced engine power
ANSWER : Hi there. Unfortunately, this is a very difficult question to answer since we don’t know which codes are showing up during an OBD-II diagnostic exam. However, what the local auto parts store probably did was a code scan and not a full code download. There is a huge difference between the two. When a problem is discovered by a sensor, an error code is created and stored in the ECU. This helps a mechanic determine what is causing the fault and make repairs to resolve your issues. However, resetting the ECU and clearing the codes won’t always resolve the root issue. The only thing this does is reset the ECU to allow sensors another opportunity to determine if faults occur. The best way to have your cars hard to accelerate issues properly diagnosed is by having a professional mobile mechanic complete a car is slow to accelerate inspection at your location. This will allow them to download all stored error codes, clear those codes with a professional digital diagnostic scan tool and pinpoint the root source of this issue. If an ECU relearn is recommended after this inspection, that will be verified by the mechanic that comes to your location. That would be the last thing I would recommend having done, as your issues might be mechanical or electrical in nature that need to be fixed.

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driver’s door ajar light will not go off, computer not working, reset button does not work
ANSWER : The drivers door ajar switch is mounted on the door latch inside the driver’s door. If you check the striker where the latch hits in the door jam to see if it was moved. You should be able to see if it is moved by revealing clean paint areas around the striker.

If it moved, then have it put back to the correct position to operate the door ajar switch and door latch. If this does not fix the door ajar light, then the latch and switch may have gotten damaged and may have blown a fuse in the process that would power the computer screen also. Have the door inspected and repaired by a mechanic as needed by looking at the damaged switch and determining if it will require a door panel removal.

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How do you reset the computer on a lincoln ls 2003
ANSWER : If you replaced the throttle body or its sensor and had a code for that part, then you will need to have the system scanned and cleared using a scanner capable of clearing the code. After this done, road test the car to make sure the throttle works correctly.

If you need some help with this, consider getting some help from a qualified technician who has the tools and experience to address your trouble code and reset the computer as necessary.

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How do I reset the trip computer?
ANSWER : The average fuel consumption, average speed, Trip B, and elapsed time features can all be reset individually, or they can all be reset simultaneously. To reset all of these trip computer features at once, press and hold the Trip Computer switch for more than three seconds.

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Battery change. Do you do computer reset after battery change?
ANSWER : Hi there:

The ECU contains a small battery inside of it that acts as a back up when the battery drains or is removed; which ensures that data is not wiped away when the battery is replaced. There is no need to reset the computer per say, but if you had any error codes that indicated a problem existed; then you’ll need to have a professional mechanic complete a check engine light inspection.

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97 jeep grand Cherokee Laredo that dosentbshift to 2nd gear, have to disconnect battery to reset computer sobit will work again
ANSWER : Hi there. Typically this issue is due to a damaged shift solenoid, or an issue with the electrical harness fro the ECU to the shift solenoids. It is also possible that there is internal damage such as a broken seal or gasket that is creating an error code which can disable the shifting. Due to the fact that there are multiple possible sources, and resetting the ECU can cause multiple electrical problems overtime, it’s best to have a professional mechanic come to your location and complete a car is hard to shift inspection. This will permit them to isolate the source of this problem and recommend the right repairs.

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If I replace the intake manifold gasket, is any computer reset involved?
ANSWER : You should not have any kind of computer reset unless your check engine light is on now. If it is on now then you would still need to have it checked and cleared after doing the {intake manifold gasket.](https://www.yourmechanic.com/services/intake-manifold-gaskets-replacement) You can have a mechanic like one from YourMechanic come to you and check and clear the check engine light on for you.

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