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Updated: May 22, 2023
Auto Repair Information Topics:
5 Warning Lights You Should Never Ignore!
5 Car Noises You Should Not Ignore
5 Ways To Save Money on Auto Repairs
5 Things Your Car May Need Now!
5 Things Your Car May Not Need
A
ABS Scan Tools
ABS TRAINING GUIDE
Accidents: Mechanical Problems That Increase Your Risk
Active Safety Systems
Acronyms
Airbags & Crash Sensors
Airbag Recalls
Air Conditioning
Air Conditioning Self-Test Quiz (Download or Print PDF file)
Air Conditioning Frequently Asked Questions
Air Conditioning (alternative refrigerants)
Air Conditioning (automatic climate control systems)
Air Conditioning Compressors (causes of failure)
Air Conditioning Compressors (flushing)
Air Conditioning (Inspection Checklist)
Air Conditioning (how to recharge)
Air Conditioning (not cooling)
Air Conditioning (MACS recommended service procedures)
Air Conditioning (retrofitting older R12 systems to R134a)
Air Conditioning Service Equipment
Air Conditioning Service Best Practices
Air Conditioning Troubleshooting (General Tips)
Air Filter
Air Filter (Ford Focus PZEV 150K Sealed Air Filter)
Air/Fuel Ratios
Airflow Sensors (MAF)
Airflow Sensors (VAF)
Air/Fuel Ratio Sensors (wide ratio O2 sensors)
Air Ride Suspensions
Air Temperature Sensors
Alignment (wheel)
Alignment Problems
Alignment (truck & SUVs)
ALIGNMENT TRAINING GUIDE
Alternative Fuels
Alternative Refrigerants
Alternators (high output)
Alternator Failure Causes
Alternators (How To Replace)
Alternator Testing
Alternator Troubleshooting
Aluminum (How to Weld)
Antifreeze (different types)
Antifreeze (universal)
Antilock Brakes (ABS)
Antilock Brake Systems Application List
Antilock Brake Codes (how to read)
Antilock Brakes (How to Bleed System)
Antilock Brakes (Bendix 9 Jeep)
Antilock Brakes (Bendix 10 Chrysler)
Antilock Brakes (Delphi DBC-7 GM)
Antilock Brakes (Honda)
Antilock Brakes (Kelsey-Hayes RWAL/RABS)
Antilock Brakes (Kelsey-Hayes 4WAL)
Antilock Brakes (Teves Mk20)
Anti-Theft System (troubleshoot)
Asbestos
Auto Insurance
Automatic Locking Hubs (4WD)
Automatic Transmission Fluid (types and applications)
Automatic Transmission Repair
Automotive Accessories
Automotive Electrical Circuits
Autonomous Vehicles
Auto Parts (Counterfeit)
Auto Parts (Most Often Replaced)
Auto Parts (Where to buy)
Auto Repair
Auto Repair Bills (how to pay them)
Auto Repair Costs
Auto Repair Fraud & Ripoffs
Auto Repair Guidelines
Auto Repair Manuals & Books
Auto Theft Prevention
B
Balancing (wheel)
Ball Joints
Battery & Electrical System
Battery, Charging, Starting Systems Self-Test Quiz
Battery Frequently Asked Questions
Battery & Alternator Failure Due to Infrequent & Short Trip Driving
Battery Diagnosis
Battery Disconnect Cautions & Problems
Battery Jump Starting
Battery Replace
Battery Runs Down
Battery Safety
Battery Testing & Recharging
Bearings (engine)
Bearings (wheel, sealed hub)
Belts
Belts (Serpentine)
Belt Tensioners
Big 3 Brake Symposium Notes
Oct 2002
Big 3 Brake Symposium Notes May 2001
Biodiesel vs Diesel: Which Is Best?
Blog page
Blowby
BMW's Condition Based Service System
Bolts (How to Remove Nuts & Bolts
Bosch Platinum +4 Spark Plugs
Brakes
Brakes (antilock)
Brake Balance & Electronic Brake Proportioning
Brake Bleeding
Brake Bleeding (ABS)
Brake-By-Wire Electronic Braking Systems
Brake Calipers
Brake Calipers (loaded)
Brake Drums
Brake Dust
Brake Failure (NO Brakes!)
Brake Fluid
Brake Hydraulics
Brake Line Failure
Brake Grease
Brake Master Cylinder
BRAKE TRAINING GUIDE
Brakes (disc)
Brakes (parking)
Brakes (power)
Brake Pad Installation Tips
Brake Problems
Brake Noise
Brake pads (ceramic)
Brake Pads (choosing the best replacement pads)
Brake Repair
Brake Rotors
Brake Rotors (composite)
Brake Rotors (design)
Brake Rotor Service
Brake Squeal
Brake Squeal (more)
Brake System Self-Test Quiz (Downloadable PDF file)
Brake Warning Light On
Brake Wear Problem (2008-2010 Honda Accord)
Buick 3800 Engine Diagnosis
C
Cabin Air Filter
Calipers (how to diagnose and repair)
Calipers (loaded)
Camshafts (choosing a performance cam)
CAN communication problem with scantool
CAN Codes
Car Accidents (causes of)
Car Questions & Answers
Carburetor Problems
Carburetor or EFI: Which Is Best?
Carburetor (Honda Keihin Repair)
CAR CARE GUIDE
Car Door Frozen
Car Fires
Car Care, Lubrication & Maintenance
Car Repair Advice
Car Trouble
CARLEYSOFTWARE (Automotive Training Guides)

Car Won't Start
Catalytic Converters
Catalytic Converters (troubleshooting a P0420 code)
Catalytic Converter Thefts
Ceramic Brake Pads
Ceramic Brake Pads (more)
Charging System
Charging System Checks
Check Engine Light
Check Engine Light On
Chevy Engine Firing Orders
Chrysler Firing Orders
Clean Diesel
Clutch
Clutch Diagnosis & Replacement
Clutch Installation Tips from LUK
Clutch Problems
Clutch Service
CO2 Emissions (global warming issues)
Coil-Over-Plug Ignition Systems (COP)
Cold Air Intake Systems
Common Car problems and Solutions
Compressors (A/C)
Compressor PAG Oil Application Chart
Compression Ratio
Compression Testing
Computerized Engine Control Systems
Controller Area Network (CAN) Diagnostics
Coolant (different types)
Coolant Leaks
Coolant Recovery Systems
Coolant Sensors
Cooling System Electrolysis Corrosion (causes & cures)
Cooling System Self-Test Quiz
Cooling System Service
Cooling System Service Equipment
Cooling Fan (electric)
Cooling Fan Relay Problems
Cooling Fan (mechanical)
Cooling System
Counterfeit Auto Parts
COVID-19 Virus and Your Car
Crack Repair
Crankshaft Position Sensors (CKP)
Crappy Cars
Crash Test Safety Ratings
Cruise Control
CV Joints & FWD shafts (basics)
CV Joints (service)
CV Joints (more on service)
Cylinder Bore Honing Techniques
Cylinder Bore Surface Finishes (by the numbers)
Cylinder Bore Surface Finish (Plateau)
Cylinder Head Crack Repairs (cast iron)
Cylinder Head Components
Cylinder Head Resurfacing
Cylinder Head Resurfacing (more)
Cylinder Misfire
D
Defensive Driving
Detonation (causes of)
Diagnostic Trouble Codes (code numbers & definitions)
Diesel Diagnosis
Diesel Fuel Treatments
Diesel Piston Damage Diagnosis
Diesel vs Hybrid
Diesel Technology
Diesel Warranty Issues (GM Duramax)
Digital Storage Oscilloscopes (DSO)
Disc Brakes
Disc Brake Repair
Distracted Driving Poses Safety Risk
Distributors
Distributorless Ignition Systems (DIS)
Distributorless Ignition Systems (multi-coil)
Driving Safety: How to Keep Yourself and Your Passengers Safe
Drum Brakes
Drunk Driving: the Dangers, Deaths & DUIs
E
E15 Ethanol Gasoline Fuel Blend
E85 Ethanol Alcohol Alternative Fuel
Electrical System Basics Self-Test Quiz
Electrical Circuits
Electrical Loads for Automotive Systems, Lighting and Accessories
Electrical System Power Centers, Relays & Fuses
Electrical System Troubleshooting
Electric eBikes: What to Consider Before You Buy
Electric Car (General Motors EV1)
Electric Car (Should You Buy One?)
Electric Car Revolution
Electric Motors Versus ICE Engines: What's the Difference? (new technology)
Electric Power Steering
Electronic Braking Systems
Electronic Fuel Injection Basics
Electronic Throttle Control (ESC)
Emission Control Systems
Emission Control Basics Self-Test Quiz (Download or Print PDF file)
Emission Controls & Emissions Problems
Emission Failures
Emissions Testing
Emissions Testing: Exhaust Analysis
EMISSION TRAINING GUIDE
Engine Balancing
Engine Compression Testing
Engine Components Self-Test Quiz (Download or Print PDF file)
Engine Diagnosis & Repair
Engine Diagnosis Buick 3800 V6
Engine Diagnosis Ford 3.0L Duratec V6
Engine Displacement
Engine Failure (causes)
Engine Frequently Asked Questions
Engine Hesitates or Stumbles When Accelerating
Engine Management System
Engine Misfire
Engine Misfire P0300 Code
Engine Noise
Engine Noise in Dodge Caravan & Chrysler Minivans
Engine Overheating
Engine Pings or Knocks When Accelerating
Engine Problems (intermittent)
Engine Repair Options
Engine Rebuilding Tips
How to Rebuild Engine (replacing internal engine parts)
Engine Replacement Tips
Engine Service (Cadillac Northstar V8)
Engine Service (Chrysler 3.5L V6)
Engine Service (Chrysler/Mitsubishi 3.0L V6)
Engine Service (Chrysler Neon 2.0L)
Engine Service (OHC Cylinder Head Repairs)
Engine Sensors (engine management systems)
Engine Sensors (types of)
Engine Stalling
Engine Using To Much Oil
Engine Vacuum Leak
Engine Won't Crank or Start
Engine Won't Start, No Fuel
Engine Won't Start, No Spark
Environmental Impact of Air Conditioning
Environmental Issues Caused by Automobiles
EVAP Evaporative Emission Control System
Exhaust Analysis
Exhaust Backpressure
Exhaust Gas Recirculation (EGR)
Exhaust Problems
Exhaust Smoke (various causes of)
F
Fan Clutch
Fault Codes (look up code numbers & definitions)
Fault Codes (most common)
Favorite Cars
Filter (air)
Filter (cabin air)
Filters (oil)
Firing Orders (Chevy)
Firing Orders (Chrysler)
Firing Orders (Ford)
Flash Reprogramming PCMs
Flash Reprogramming PCMs (more)
Flat tire: What To Do If You Have One
Floor Jacks & Jack Stands (Safely Raise Your Vehicle)
Flywheel Resurfacing
Ford 3.0L Duratec V6 Engine Diagnosis
Ford Focus PZEV 150K Sealed Air Filter
Four Wheel Drive Locking Hubs
Four Wheel Locking Hubs (more)
Front-Wheel Drive (FWD)
FRONT-WHEEL DRIVE TRAINING GUIDE
Fuel Contamination: What Happens If You Put the WRONG Fuel In Your Car
Fuel Economy (causes of poor fuel economy)
Fuel Filter
Fuel Gauges ( Troubleshooting)
Fuel Injection, Fuel Pump, Fuel System
Fuel Injection Diagnostics
Fuel Injection - How It Affects Emissions
Fuel Injection Direct
Fuel Injection Problems
Fuel Injection: Diagnosing Returnless EFI
Fuel Injection (How it Works)
Fuel Injection (Toyota)
Fuel Injection Self-Test Quiz (Download or Print PDF file)
Fuel Injectors (cleaning)
Fuel Injectors (troubleshooting)
Fuel Pump Diagnosis
Fuel Pump Diagnosis Tips from Carter
Fuel Pump (how to replace in-tank pump)
Fuel Pump (electric)
Fuel Pump (mechanical)
Fuel Pump Warranty Issues
Fuel Saving gadgets
Fuel Saving Tips
Fuel System Frequently Asked Questions
Fuel Trim (What Is It?)
Fuses
Future Automotive Technology
G
Gas Cap Loose?
Gas Prices
Gasoline Performance Problems
Gasoline (watch out for bad gas)
Gasoline Direct Injection (GDI)
Gasoline Direct Injection Intake Valve Deposits
Gasoline Fuel Treatments
Gasoline Octane Ratings
Global Warming and Climate Change: What Do We Know Now?
Glossary of Automotive Terms A to E
Glossary of Automotive Terms F to P
Glossary of Automotive Terms R to Z
Greenhouse Gas Emissions (CO2)
H
Head Bolt Basics
Head Bolts (Torque-to-yield Installation & Removal Tips)
Head Gasket Failure: Common Causes
Head Gasket Leaks (How to Fix)
Head Gaskets: Preventing Repeat Failures
Head Gaskets: Why They Fail
Headlight Frequently Asked Questions
Headlights (All About Different Kinds)
Headlights (troubleshooting)
Headlights (high intensity discharge or HID)
Heater Service
HFO-1234yf
Honda Antilock Brakes
Honda Accord Rear Brake Wear Problem
Honda Civic Hybrid Battery Problems
Horsepower & Torque
Hot Weather Driving Tips
Hubs (automatic locking 4WD)
Hybrid Service Tips
Hybrid Car (Should You Buy One?)
Hybrid Vehicle Safety Hazards
Hybrid vs Diesel
I
Idle Speed Control System
Idle Surge (cause & cure)
Ignition Coil Diagnosis & Testing
Ignition Coils (multi-coil systems)
Ignition Switch Problems
Ignition System
Ignition System Quiz
I/M 240
Instrument Cluster (troubleshoot)
Insurance (auto insurance information)
Intake Valve Deposits in Gas Direct Injection Engines
Interior Pollution Inside Your Car
J
Jump Starting
K
Kia Idler Pulley Noise
Key Fob Won't Start Car
Key Fob Remote Won't Unlock Door
Knock Sensors
L
Leak Down testing
Lean Codes (P0171 & P0174)
LED Headlamps
Lemon Laws
Library of Automotive Repair & Diagnosis Articles
Locking Hubs (4WD)
Low Oil Pressure
Low Oil Pressure - Warning Light On

Larry's Guide to Check Engine Light Diagnostics (PDF ebook)
M
MacPherson Struts
Maintenance Chart
Maintenance Recommendations
Maintenance Tips
Malfunction Indicator Lamp (MIL)
Manifold Absolute Pressure Sensors (MAP)
Mass Airflow Sensors (MAF)
Master Cylinder
Misfire Analysis
Misfire Diagnosis
Misfires (causes of P0300 random misfire code)
Misfire Diagnosis Chrysler 3.5L V6
Mode 06 Diagnostics
Motor Mounts
Motor Mounts (Saturn)
Motor Oil
Motor Oil API Ratings
Motor Oil Specifications 2020
Motorist Assurance Program (MAP)
Muffler (How to Replace)
Mufflers (performance)
Muscle Car Restoration Work
Mitchell 1 DIY eautorepair manuals

N
No-start Diagnosis
Noise (Brakes)
Noise (Car Noises You Should Not Ignore
Noise (Engine)
O
OBD II Diagnostic Tips
OBD II Plug-In Emissions Testing
OBD Monitor Not Ready
OBD II System Self-Test Quiz
ONBOARD DIAGNOSTICS II TRAINING GUIDE
Octane Ratings
OEM Service Information Websites
Odors Inside Your Car (causes and cures)
OHC Cylinder Head Cutaway
Oil
Oil Additives
Oil Changes (How Often?)
Oil Changes (What Technicians Say)
Oil Classifications (API ratings)
Oil Consumption (When Is It Too Much?)
Oil Filters
Oil Leaks
Oil Pressure
Oil Pressure Warning Light On
Oil Pumps
Oil Pump Diagnosis
Oil Pumps High Flow
Oil Pump (High Volume)
Oil Service Intervals
Oil (Synthetic)
Oil Viscosity
Onboard Diagnostics II (OBD II)
OBD II Diagnostics
OBD II Driveability & Emissions Problems
Oxygen Sensors
Oxygen Sensors & emissions
Oxygen Sensor Locations
Oxygen Sensors (wideband)
Overheating (causes)
P
P0171 & P0174 Lean Codes
P0420 Catalyst Efficiency Code
Parking Brake
Parking Brake (Electronic)
Parts (Which Ones Fail & When)
PCM
Pistons (evolution of design)
Piston Rings (steel)
Piston Rings (stock & performance)
Piston Ring End Gap Recommendations
Plateau Cylinder Bore Finish
Poor Fuel Economy
Positive Crankcase Ventilation (PCV)
Power Brakes
Power Steering (electric)
Power Steering Fluid
Power Steering (GM & Ford variable-assist systems)
Powertrain Control Modules (PCMs)
Powertrain Control Module Performance Tuning
Powertrain Control Modules Flash Reprogramming
Powertrain Control Module Reprogramming (more)
Power Windows
Preventive Maintenance
Push Button Start System
R
R12 to R134 RETROFIT GUIDE
R-1234yf Refrigerant
R134a Ban?
Rack & Pinion Steering (variable-assist)
Rack & Pinion Steering Troubleshooting
Rack & Pinion Steering Inner Tie Rod Sockets
Radiator Repair & Replacement
Random Misfires
Recalls - Don't Ignore Them!
Refrigerants (new)
Refrigerant Contamination
Refrigerant Recovery Machines
Relays
Repair Costs To Fix Your Car
Repair Costs: Don't Get Overcharged for Simple Repairs
Repair Facts for Consumers
Repair Fraud, Scams & Rip-Offs
Repair Shops
Repairophobia
Repairs (When They Are Needed)
Reprogram PCM
Re-Refined Motor Oil
Ride Control Diagnosis (shocks & struts)
Ride Height
Rotary Valves for Internal Combustion Engines (new technology)
Rotors
Rotors (composite)
Rotors (design)
S
Safety Milestones in Automotive History
Safety Tips When Doing Auto Repairs
Safety Ratings Vehicle Crash Tests
Saturn No Start Diagnosis
SCAN TOOL TRAINING GUIDE

Scan Tool Help
Scan Tools (how to buy)
Scan Tools (ABS)
Scan Tools (performance)
Scheduled Maintenance
Scopes (Digital Storage Oscilloscopes)
Self-Driving Cars & Driverless Vehicles
SENSOR TRAINING GUIDE
Sensors
Sensors (engine management systems)
Sensors (types of)
Serpentine Belts
Shock Absorbers & Struts
Spark Knock
Spark Plug Fouling
Spark Plugs
Spark Plugs (ruthenium)
Spark Plug Technology (Iridium & Platinum)
Spark Plugs (Are Original Equipment Best?)
Spark Plug Breakage Problem (2004-2008 Ford 5.4L & 4.6L V8)
Spark Plugs (Bosch Platinum +4)
Spark Plugs & Ignition Performance
Spark Plugs for Waste Spark DIS Ignition Systems
Spark Plugs (Why They Need To Be Replaced)
Spark Plug Wires
Speeding (not a crime!)
Stability Control
Stalling (causes of)
Start Engine Push Button Diagnosis
Starter
Starter Diagnosis
Starter Problems
Starter Troubleshooting
Strut Suspensions
Steering & Suspension, Tires & Alignment
Steering (correcting a pull to one side)
Steering (electric)
Steering (rack & pinion)
Steering (variable-assist)
Steering Problems
Steering & Suspension Quiz
Stop-Start Systems
Summer Driving Tips
Superchargers
Supercharging Small Engines (sport compact cars)
Suspension (air ride)
Suspension Inspection
Suspension & strut Repairs
Suspension Vibrations
Synthetic Motor Oil
T
Technical Service Bulletins & Recalls for Your Vehicle
Technician (rating skills)
Tech Terms
Telematics
Telematics: The Connected Car
Temperature Warning Light
Test Your Automotive Knowledge Quizzes
Thermostats (How To Diagnose & Replace)
Throttle-By-Wire systems (Electronic Throttle Control)
Throttle Position Sensors (TPS)
Timing Belt (Chevy Aveo 1.6L)
Timing Belt (GM)
Timing Belt (Ford)
Timing Belts (list of interference engines)
Timing Belt (Toyota & Honda)
Timing Belt Warranty Warning
Timing Chains & Belts
Timing Chain Replacement (Mazda & Ford 3.0L DOHC V6)
Tires
Tire Care Survey Results
Tire Diagnosis
Tire Expiration Dates (and Dangers)
Tire Failure (causes)
Tire (Flat)
Tire Pressure Monitoring Systems (TPMS)
Tire Pressure Monitoring System (Ford F150)
Tire Inflation Tips
Tire Rotation
Tires Run-Flat
Tire Safety
Tire Vibration
Tire Wear
Tires - When to Replace & What to Buy
Tires - Are Used Tires Safe?
Tools for Repairing & Maintaining Your Car
Tools: Cordless Power Tools versus Pneumatic Tools
Tool Resources
Torque
Torque Converters (basic operation & diagnosis)
Torque Converters (high performance)
Torque-To-Yield (TTY) Head Bolts
Torque Steer in FWD Cars
Torque Wrench (how to use)
Toxic Chemicals In Your Car's Interior
Toyota Prius Diagnostics
Toyota Recall 2005-2008 Corolla & Matrix for Computer Defect
Toyota Unintended Acceleration: Possible Causes
Toyota Steering Recall
TPMS Warning Light
Traction Control
Trailer Hitches
Trailer Brakes (mechanical & electric)
Training Resources
Transmission
Transmission Diagnosis (automatic)
Transmission Diagnosis (manual)
Transmission (electronic)
Transmission (Chrysler 45RFE)
Transmission (Ford AX4S Windstar & Taurus)
Transmission Recall: 2021-22 Hyundai & KIA Dual Clutch Automatic Transmission
Transmission Fluid (types and applications)
Transmission Fluid (changing)
Transmission Repair (automatic)
Transmission Slipping
Travel Tips
Trouble Codes (Look up numbers & definitions)
Trouble Codes (Most Common Codes & Causes)
Trouble Code Diagnostic Tips
Troubleshooting with Temperature
Tuner Scan Tools
Tune-Up
Turbocharger Diagnosis & Repair
TURBOCHARGER TRAINING GUIDE
U
Underhood Maintenance: Fluids, Filters, Belts & Hoses
Used Cars (How To Buy a Good Used Car and NOT a Lemon!)
Used Car Dealer Tricks (How NOT to get cheated!)
Used Cars (how to get rid of your old vehicle)
Used Car Inspection Checklist
Used Car Resources
Used Tires
V
Vacuum Leaks
Valve Failure (causes)
Valve Guide Repairs
Valve Seat Repairs
Valve Spring Diagnosis
Valve Stems (Tire)
Vane Airflow Sensors (VAF)
Variable Cam Timing Codes (Ford)
Variable Valve Timing Basics
Vehicle Manufacturer Websites
Vehicle Reliability Ratings
Vibrations (causes of)
Vibration (Saturn Bad Engine Mount)
Voltage Drop Testing
W
Warning Lights
Warranty Coverage (new cars by model year)
Water Pump Diagnosis
Welding (Aluminum)
What Goes Wrong With Cars (and When)
Wheel Alignment(Camber, Caster & Toe)
Wheel Alignment Self-Test Quiz (Download or Print PDF file)
Wheel Balancing
Wheel Bearings & Hubs
Wheel Bearing & Seal Service
Wheel Cylinders
Wheel Speed Sensor Diagnosis
Wideband Oxygen Sensors
Windshield Wiper Blades
Windstar Rear Axle Failure Recall
Winterizing Tips
Wrong Fuel in Your Fuel Tank? Here's What You Should and Shouldn't Do
Z
ZDDP - What is it & Why do you need it?
Browse the AA1Car Library of Diagnosis & Repair Articles
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Auto Repair Manuals & Books
OEM Automotive Service Information Websites & Access Fees
Automotive Accessories
Auto Parts
Tools & Equipment
Auto Repair Shops
Automotive Links Directory
Disclaimer
All Content Copyright AA1Car Auto Diagnosis Repair Help
Affiliate websites:
CarleySoftware (Quick Reference Training Guides)
OBD2HELP.com (Tips on Diagnosing OBD2 Faults)
Random-Misfire.com (How to Troubleshoot P0300 Codes)
ScanToolHelp.com (All About Scan Tools)
TROUBLE-CODES.com (Fault Code Definitions and Diagnostics)