- Line Pressure
- Live Data
- Live Data
- LKA
- Load Test
- Lost Communication
- Low-Side Pressure
- Low-Speed CAN
- LPG
- LSD
- MAF
- MAF Sensor
- Manual Transmission
- Manufacturer Codes
- MAP
- MFD
- MIL
- Misfire
- Mode $06
- Mode Door Actuator
- Motor Mount
- MultiAir
- Network Topology
- Neutral Safety Switch
- NOx Catalyst
- NOx Reset
- NOx Sensor
- NVH
- O2 Sensor
- OBD2
- OBD2 Modes
- OBD2 Port
- OBD-I
- OBD-II
- OBD Port
- OCS
- ODS Initialization
- Oil Pressure Sensor
- Oil Reset
- OPDS Initialization
- Open Circuit
- Orifice Tube
- OTA
- Oxygen Sensor Heater Circuit
- Oxygen Sensor Test
- Parasitic Draw
- Passive Regeneration
- PCB
- PCM
- PCV
- PCV Valve
- PDC
- PDF Report
- Pending Code
- PEPS
- Permanent Code
- PHEV
- PID
- Pin Detection
- Power Balance Test
- Present Code
- Prime Fuel Pump
- Protocols
- PWM
- Quick Scan
- R2R
- Rack and Pinion
- Radar
- RCTA
- Readiness Monitors
- Reductant Injector
- Reference Voltage
- Refrigerant Pressure Sensor
- Regen Braking
- Regen Inhibit
- Relay
- Relay Logic
- Remote Support
- Replace Airbag ECU Module
- Reset Crankshaft
- Ride Height Sensor
- Ripple Voltage
- Runout
- RWB
- RWD
- SAE
- SAE J1708
- SAE J1939
- SAE J2534
- SAI Pump
- SAS
- Scanner
- Scan Tool
- SCR
- SCR Efficiency
- Seat Match
- Secondary Air Injection
- Self-Diagnostics
- Serpentine Belt
- Service Function
