Will a home code reader/scanner let me fix my car?

Can I fix my car with a home code reader/scanner?
Experienced mechanics share their insights in answering this question :
Aftermarket code readers and scanners cannot, by themselves, be used to fix your car. The scanner is used to retrieve diagnostic trouble codes (DTCs) from the various control modules on the vehicle. After using your scanner to retrieve DTCs, you must compare these codes to a DTC index to find the appropriate series of tests that are used to diagnose the system. These readers only helps allow you to pinpoint faulty components. The repairs themselves are done separately.

To fix your car, will you need access to the diagnostic tests as well as the necessary testing equipment. Having a home reader, however, may allow you to clear a malfunction indicator lamp (MIL).

How to Identify and Fix Common car Problems ?

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

Do OBD2 readers work on all cars? Most OBD2 scanners and car code readers do not work on all cars. If you are looking for an OBD2 scanner or car code reader, you should check if it works with your particular make and model before buying it.
A scan tool is a much more advanced diagnostic tool than a truck code reader. It reads and clears basic fault codes like a code reader, but it also lets you read pending, generic and OEM-specific fault codes.
The standard five-digit OBD-II codes are found across all makes and models, but some manufacturers may use OEM (Original Equipment Manufacturer) codes for systems that are specifically unique to their vehicles. You`ll need higher quality scanners to properly access these codes.
Not physically (unless the scanner is deliberately, physically tampered with), but but give OBD2 is a bi-directional protocol which can alter the programming of the ECU, it`s possible to accidentally screw up the parameters the ECU relies on to make the engine run smoothly and efficiently.
Even though OBD2 is a universal standard, it can happen that a scanner is not compatible or doesn`t work well with your vehicle. So we recommend you check whether your chosen OBD scanner is compatible with your vehicle.
OBD REMAPPING BENEFITS FOR TURBOCHARGED PETROL ENGINES

They are also ideal candidates for remapping as the ECU also controls the wastegate (turbo boost pressure control). After your ECU upgrade via OBD to your turbocharged petrol engine, you will enjoy: Increased horsepower. Increased torque.

Easy to Use: OBD1 Scanner Adapter Cable is easy to use, its 12 pins allows you to connect a vehicle with a OBD1 12 pins socket with your existing OBD2 16 pins tool, which works perfectly with scanning software, stable transmission, antijamming.
Method 3: Use the Ignition Key and Check the Dashboard

The ignition key is one of the more commonly used ways of diagnosing check engine light trouble codes without an OBD-2 scanner.

Not all barcode scanners can read all barcodes. Laser barcode scanners and linear imagers read only 1D barcode scanners. Imager (camera-based) 2D barcode scanners read all common 1D and 2D barcodes.
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.
Can I reset my ECU using an OBD2 scanner? No. An OBD2 scanner can only be used to detect error codes on your car. It cannot perform tasks like an ECU reset or any modifications on your car.
Your Car Won`t Start

Your engine could cut while you`re driving, as well, if the ECU malfunctions. Once you`ve coasted to a stop, you won`t be able to get your automobile started again. It`s a good idea to get your engine control module tested at the first sign of trouble.

Supported Vehicles:

All Ford, Mazda, Lincoln, Mercury vehicles that can be addressed by supported adapters. It is 99% of models after 2000 and around 92% of models after 1996 (the year when OBD2 became a standart in USA).

If the car is cranking, but won`t start, use an OBD2 scanner to find out if there are any stored trouble codes in the trouble code memory. By reading the trouble codes, you can skip over many troubleshooting steps and jump directly to troubleshooting the part you got the trouble code for.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I put the wrong key in my car and a few weeks later my car just shut down and it will not start I believe it’s the computer but…
ANSWER : Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that time, put the original key in the ignition and turn it on. Activate everything in the car even though there is no power. Then remove the key and hook up the battery cables. The computer should have reset and reset the security. If the security is still being tripped, then I recommend seeking out a professional, such as one from Your Mechanic, to help you

Replaced alternator on car 2 times each time shows it’s charging 14v let car run for a little bit then test drive and car voltage
ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.

Can i retrieve CEL code from car … forgot what code it hade in my car .. put headgasket sealer and i erase the code ..
ANSWER : Once a trouble code is erased, it cannot be retrieved. The engine controller does not have a "recycle bin" like they have on Windows. If the car still has a problem, the code will come back up after some driving. However, the controller will not turn on the CEL until it has seen the malfunction on two separate "trips." A "trip" is a driving cycle where the car is started cold, driven until it is fully warm and through a certain number of accelerations, and shut down. So you might not see the CEL for a couple of days. As for the "head gasket sealer," I wouldn’t hold out too much hope of that solving a problem. At the very best it might put off the symptoms for a short while. If you need help interpreting codes that come up, or solving a head gasket issue, contact Your Mechanic. They can send a technician to your home or office to read the codes on your car and help you decide what to do.

Gasoline inside the car?
ANSWER : The first concern is whether you could have an exhaust leak or a fuel leak. If leaks of that type exist, they should be repaired as both are safety hazards. Occasionally, just due to the weather, exhaust fumes can get drawn into cabin air. At no time, however, is it normal for significant amounts of raw gasoline to be in the air, or leaking as a liquid, especially on a modern car which has sophisticated systems to capture any potential fugitive emissions of vaporous gasoline. If this was a one-off incident, and just limited to exhaust odor, not to worry but if you regularly detect the distinct odor of raw gasoline, that should be investigated at once because leaking gasoline is a fire/explosion hazard. As far as damage to personal belongings from exhaust or gasoline vapors, in ordinary concentrations and if the exposure is fleeting, there is no damage potential. The reason is gasoline is highly volatile and so evaporates into the atmosphere. However, if you spill liquid gasoline on materials, the non volatile compounds will be around for a long time and indeed will destroy many common materials as gasoline is a highly aggressive solvent. Most of the hazard from gasoline vapors is not to personal property but rather to your health because gasoline contains known, well documented carcinogens such as benzene. So, the bottom line is fleeting exposure to the vapors will not damage property but will damage your health. With regard to leaks (exhaust or gasoline, liquid or vapor), if you desire a safety inspection performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a comprehensive vehicle safety inspection and the responding certified mechanic will address all of your concerns and look at the condition of your entire vehicle. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Am I able to ask to keep the amount of money the insurance is going to pay to fix my totaled car to fix myself?
ANSWER : Hi there. In general, when the insurance company considers the vehicle a ’total loss’, they will send you the settlement amount, minus the deductible. However, every insurance company is different and unique in regards to their own regulations and policies. I would highly recommend calling your insurance company and clarify what they are willing to do to settle your claim.

Will a home code reader/scanner let me fix my car?
ANSWER : Aftermarket code readers and scanners cannot, by themselves, be used to fix your car. The scanner is used to retrieve diagnostic trouble codes (DTCs) from the various control modules on the vehicle. After using your scanner to retrieve DTCs, you must compare these codes to a DTC index to find the appropriate series of tests that are used to diagnose the system. These readers only helps allow you to pinpoint faulty components. The repairs themselves are done separately.

To fix your car, will you need access to the diagnostic tests as well as the necessary testing equipment. Having a home reader, however, may allow you to clear a malfunction indicator lamp (MIL).

Got my rear main seal fixed, but my car keeps having a rough idle, cutting off & the Electronic Throttle Control Light is on.
ANSWER : It sounds like you may have a faulty electronic throttle control unit. The electronic throttle unit opens and closes the throttle blade based upon input from various engine control sensors, including the accelerator pedal. This unit also controls, among other things, the cruise control function as well. When this control unit fails, this may cause intermittent stalling issues and rough idle problems. This is usually repaired by removing and replacing the throtte control unit. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle at your earliest convenience.

I just had my starter changed when I turned car on didn’t stay on. I had someone pass current and car turned on fine I drove car f
ANSWER : Hi there. It is quite possible that the starting issue you’re currently having with your Ford Focus is not related to the starter replacement. However, it could be due to might be due to your battery problem. When your battery does not have enough power to engage the starter, it also impacts other important systems critical to maintaining ignition, ranging from the ignition coils to fuel system components. It might be a good idea to have a professional mobile mechanic from our team come to your location to compete a car starts then dies inspection, so they can correctly diagnose this issue and ensure the right repairs are made.