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diagnostics

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How to Troubleshoot a Car That Has Extra Bounce or Sway
Bounce or sway while driving a car can be caused by faulty struts, shocks, or worn out tires. Check and inflate car tires to begin the diagnosis.
How to Troubleshoot a Car That is Hard to Start
"Car not starting" is a common complaint among car owners and is caused by faulty car batteries, spark plugs, car starter, or fuel pump.
How to Troubleshoot a Car That Doesn't Respond to The Gas Pedal
Car gas pedals control the speed of the car. Inspect the throttle and pedal first, then the fuel filter and fuel pump if the pedal doesn't respond.
The Best Tool to Find Coolant Leaks
Diagnosing a car issue can be a tricky without proper tools. A coolant pressure tester is useful for diagnosing overheating issues and coolant leaks.
The Best Tool to Scan for Extra Diagnostic Capabilities
Scan tools help mechanics quickly figure out what issues are present in a vehicle. Snap-On's Versus lets technicians look at several areas at a time.
The Best Tool to Diagnose Sensor Failures
Mechanics may regularly run into sensor failures when performing a repair service. Automotive oscilloscopes help properly diagnose these issues.
How to Test Your Alternator
Having your alternator fail can leave you stranded on the side of the road. Though it is not necessary to know every aspect as to how the alternator works, knowing...
How to Know When to Replace Car Tires
Car tires get worn out after miles on the road. Inspect tires for damage and check tread depth with a coin to make sure car tires are in good shape.
How to Fix a Car That Won’t Start
Having a car that doesn't start is frustrating. Try a battery test, fuel pump test, and check the spark plugs to help get your car started again.
How to Put Air in Your Car Tires
Tire maintenance is part of responsible vehicle ownership and maintenance. Your tires are the one component on your car that is always in contact with the...
Should I Buy a Bidirectional Scanner?
Automotive technician jobs require mechanics to use bidirectional scanner to take as well as input information when diagnosing car problems.
Is It Time to Upgrade Your OBD Scanner?
Automotive technician jobs require OBD scanners. Use yours when a problem is obvious to check if you need to upgrade your Onboard Diagnostics scanner.
How to Disable OnStar
OnStar is a subscription-based service that provides remote vehicle diagnostics, communications, security, and other features for vehicles. The company is a subsidiary of General Motors, and is popular...
How to Diagnose a Cooling System Problem
You may be driving down the road or sitting at a stop light when you first notice the temperature gauge in your vehicle starting to climb. If you let it go...
I Have No Idea What's Wrong With My Car - Where Do I Begin?
If you’re like the majority of people in the U.S., you use...
A Mechanic's Guide to Automotive Careers
Automotive careers have high job security and an ability to work anywhere in the world. Get ASE certified to become an automotive master mechanic.
Why Misfires are Often Misdiagnosed
Properly diagnosing a misfire can be a challenge, as a variety of symptoms can cause it, or a different problem could be present.
How to Diagnose Your Car Problems If You Know Nothing About Cars
Learn how you can diagnose car problems like engine issues without using diagnostic tools or any prior knowledge about cars.
How to Diagnose a No-Spark or Loss of Power Condition on a Modern Car
Misfires caused by a loss of power condition on a car can be tricky to diagnose, but are necessary to fix to avoid further damage and costly repairs.
10 Best Automotive Scanners
Automotive scanners are a great tool to get quick diagnostics on a car. The Donop Professional U480 can help you troubleshoot issues on the road.

Related questions

Question
toyota carina 3 1996 diagonestic port
Thanks for writing in about your Toyota Carina. You should check in behind the left change drawer. You have to remove the drawer to see the connector. If the connector is not there, the next place to check would be...
Question
Truck slightly jumps at high speeds
Hello. It is possible that the rear differential is experiencing backlash. Backlash is normal in the differential and every truck will experience this. However, the backlash shouldn’t be so great that it causes the truck to jump. This may be...
Question
VDC Off and Slip lights come on and speedometer stops working when driving car while Memoscan U581 is connected for Live Data
The scanner you have, and many other aftermarket scanners and those insurance devices that hook up to the OBD connector, are known to cause various problems that can arise way after the tools are removed. You should clear any codes...
Question
Faulty brakes cause unpredictable stopping distance
Hello. Bumpy roads can cause the ABS system to have trouble working correctly. Bumpy roads cause changes in the speed of the wheels which is the main input for the ABS system. If computer is not reading correctly then the...
Question
Car stalls after water pump, timing belt, plugs, valves replacements
Many different systems can cause a stalling malfunction on your vehicle. The most common are a fuel pump, fuel filter, spark plugs, battery, wiring fault or a crank/cam sensor. If the timing belt slipped off and caused the components to...
Question
Speedometer stopped working 20km
Hi there. For your Ford E-250, it is likely that there is an issue with the instrument cluster itself, the vehicle speed sensor, or the wheel speed sensor. All of those components play a critical role in calculating or...
Question
Step by step troubleshooting of DTC fault codes
Each of these codes are for different components and since you swapped the motor with a different size motor than what the car had may be a big problem. You would need to have each code diagnosed separately to see...
Question
battery voltage falls when engine fan kicks in
The alternator may not be charging; when you put the fan on, it could be drawing too much power so the engine needs to stay running and will stall and kill the battery if battery gets too low. Check the...
Question
Check engine light is on.. Its not running any differently and it starts normally..
You need to have the engine computer scanned to see what trouble code is stored. Not all codes will cause the engine to run bad or cause a noticeable problem. For instance, a trouble code could be triggered by a...
Question
After parked overnight, car loses all electrical power
Hello. This may sound strange, but were you parked under a street light when the battery died? I have experienced faulty florescent lights putting out RF signals (the signals that your remote fob use) that do not let the car...
Question
Clutch and revvs
This sounds like your clutch needs replacing. I can't really advise you very well because I don't know the year of your car. If your car does actually have 17,000, I would take it back to the dealer, assuming you...
Question
I need to know the diagnostic procedure for dtc p0717. Want to test wires before taking out transmission
If the sensor only has two wires, it is a reluctant AC sensor. If the sensor has three wires then it is a hall effect DC sensor. A two wire sensor will produce a sine wave signal: '()(-)()(-)(_)' or steady...
Question
Check engine light on & OBD #P0171
P0171 for your car is "system too lean." The most common cause is a vacuum leak and it can come from a leaky hose or a leaky gasket. However, I did a quick search and found someone on the forums...
Question
Speedometer and gears failed; car towed - 2009 Kia Borrego
It seems like the problem is one the shop may have not experienced just yet or they may have found a big problem and are trying to work with Kia directly for warranty or recall information. Take the vehicle back...
Question
ABS light comes on when I start driving - 1994 Acura Vigor
There is the possibility of a deeper electrical problem like a broken wire or corrosion inside a wire that may be very difficult to pick up on. Have an automotive technician experienced in diagnosing electical bugs dig out the problem....
Question
Brake pedal to floor; two car lengths to stop car
Hello. This diagnosis sounds correct. There is clearly a failed brake hydraulic component and safety issue. Consult your Owners Manual to determine if your vehicle is still under warranty. If so, the vehicle should be towed to the dealer. If...
Question
ABS and brake light is on
If the ABS warning light is on, that means that there are downloadable ABS diagnostic trouble codes, much like the codes you would download if you have a Check Engine Light diagnostic. The ABS trouble codes will give a general...
Question
My car won't start - Hyundai Elantra
The first step that should be done is to have a certified technician, such as one from YourMechanic, download any error codes for you and diagnose your illuminated Check Engine Light. If you have a professional digital scanner, you can...
Question
Do I really have an engine problem?
If the check engine light (CEL) has illuminated that does signify that there is an issue with the engine and/or a part of the "engine management system". You should get it checked out especially as it is possible that the...
Question
Check engine light is on. I dont know what to do about it.
In order to have your check engine light is on checked you should have YourMechanic or another mechanic do a check engine light inspection. This inspection will scan the computer and retrieve any stored codes in memory. The codes received...

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