Frequently Asked OBD-II Questions (FAQ's)

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Welcome to our page of frequently asked car repair questions. This is where we answer questions and provide more information on specific things like sensors, etc.

General Questions

• What is OBD?
• OBD2 Codes Explained
• Do I have an OBD-II vehicle?
• How do I reset the "Check Engine" Light?
• What is an OBD-II Code Reader?
• What OBD-II Communication Protocols Are There?
• Glossary of Terms / OBD Definitions
• The EGR System Explained
• EBD (Electronic Brakeforce Distribution) Explained
• What is Bank 1 and Bank 2?
• What are fuel trims?

GM-Specific Questions

• How to read OBD codes for free on older GM vehicles (82-95?)
• What is the GM OBD-II Driving Cycle?

Auto Parts / Acronym Directory

• ECT Sensor - Information on what an ECT sensor is, and how it operates. ECT stands for Engine Coolant Temperature
• Knock Sensor - Description of knock sensors
• FTP Sensor - Fuel Tank Pressure sensor
• MAF Sensor - Mass Air Flow sensor article at Engine-Light-Help.com [external]
• MAP Sensor - Manifold Absolute Pressure sensor
• O2 Oxygen Sensor - Article at Engine-Light-Help.com [external]
• TPS Sensor - Throttle Position Sensor article at Engine-Light-Help.com [external]
• VSS Vehicle Speed Sensor - Article at Engine-Light-Help.com [external]

Other

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