List of generic OBD-II parameters that can be acquired on any vehicle:
(provided the vehicle ECU supports the parameter)
# DTCs stored in this ECU
MIL Lamp Status
Misfire monitoring supported
Fuel system monitoring supported
Comprehensive component monitoring supported
Misfire monitoring status
Fuel system monitoring status
Comprehensive component monitoring status
Catalyst monitoring supported
Heated catalyst monitoring supported
Evaporative system monitoring supported
Secondary air system monitoring supported
A/C system refrigerant monitoring supported
Oxygen sensor monitoring supported
Oxygen sensor heater monitoring supported
EGR system monitoring supported
Catalyst monitoring status
Heated catalyst monitoring status
Evaporative system monitoring status
Secondary air system monitoring status
A/C system refrigerant monitoring status
Oxygen sensor monitoring status
Oxygen sensor heater monitoring status
EGR system monitoring status
DTC that caused required freeze frame data storage
Fuel system 1 status
Fuel system 2 status
Calculated LOAD Value
Engine Coolant Temperature
Short Term Fuel Trim - Bank 1
Long Term Fuel Trim - Bank 1
Short Term Fuel Trim - Bank 2
Long Term Fuel Trim - Bank 2
Fuel Rail Pressure (gauge)
Intake Manifold Absolute Pressure
Engine RPM
Vehicle Speed Sensor
Ignition Timing Advance for #1 Cylinder
Intake Air Temperature
Air Flow Rate from Mass Air Flow Sensor
Absolute Throttle Position
Commanded Secondary Air Status
Location of oxygen sensors
Oxygen Sensor Output Voltage (B1-S1)
Short Term Fuel Trim (B1-S1)
Oxygen Sensor Output Voltage (B1-S2)
Short Term Fuel Trim (B1-S2)
Oxygen Sensor Output Voltage (B1-S3)
Short Term Fuel Trim (B1-S3)
Oxygen Sensor Output Voltage (B1-S4)
Short Term Fuel Trim (B1-S4)
Oxygen Sensor Output Voltage (B2-S1)
Short Term Fuel Trim (B2-S1)
Oxygen Sensor Output Voltage (B2-S2)
Short Term Fuel Trim (B2-S2)
Oxygen Sensor Output Voltage (B2-S3)
Short Term Fuel Trim (B2-S3)
Oxygen Sensor Output Voltage (B2-S4)
Short Term Fuel Trim (B2-S4)
OBD requirements to which vehicle is designed
Location of oxygen sensors
Power Take Off (PTO) Status
Time Since Engine Start
Distance Travelled While MIL is Activated
Fuel Rail Pressure relative to manifold vacuum
Fuel Rail Pressure
Equivalence Ratio (lambda) (B1-S1)
Oxygen Sensor Voltage (B1-S1)
Equivalence Ratio (lambda) (B1-S2)
Oxygen Sensor Voltage (B1-S2)
Equivalence Ratio (lambda) (B1-S3)
Oxygen Sensor Voltage (B1-S3)
Equivalence Ratio (lambda) (B1-S4)
Oxygen Sensor Voltage (B1-S4)
Equivalence Ratio (lambda) (B2-S1)
Oxygen Sensor Voltage (B2-S1)

Equivalence Ratio (lambda) (B2-S2)
Oxygen Sensor Voltage (B2-S2)
Equivalence Ratio (lambda) (B2-S3)
Oxygen Sensor Voltage (B2-S3)
Equivalence Ratio (lambda) (B2-S4)
Oxygen Sensor Voltage (B2-S4)
Commanded EGR
EGR Error
Commanded Evaporative Purge
Fuel Level Input
# warm-ups since DTCs cleared
Distance since DTCs cleared
Evap System Vapor Pressure
Barometric Pressure
Equivalence Ratio (lambda) (B1-S1)
Oxygen Sensor Current (B1-S1)
Equivalence Ratio (lambda) (B1-S2)
Oxygen Sensor Current (B1-S2)
Equivalence Ratio (lambda) (B1-S3)
Oxygen Sensor Current (B1-S3)
Equivalence Ratio (lambda) (B1-S4)
Oxygen Sensor Current (B1-S4)
Equivalence Ratio (lambda) (B2-S1)
Oxygen Sensor Current (B2-S1)
Equivalence Ratio (lambda) (B2-S2)
Oxygen Sensor Current (B2-S2)
Equivalence Ratio (lambda) (B2-S3)
Oxygen Sensor Current (B2-S3)
Equivalence Ratio (lambda) (B2-S4)
Oxygen Sensor Current (B2-S4)
Catalyst Temperature Bank 1, Sensor 1
Catalyst Temperature Bank 2, Sensor 1
Catalyst Temperature Bank 1, Sensor 2
Catalyst Temperature Bank 2, Sensor 2
Misfire monitoring enabled
Fuel system monitoring enabled
Comprehensive component monitoring enabled
Misfire monitoring complete
Fuel system monitoring complete
Comprehensive component monitoring complete
Catalyst monitoring enabled
Heated catalyst monitoring enabled
Evaporative system monitoring enabled
Secondary air system monitoring enabled
A/C system refrigerant monitoring enabled
Oxygen sensor monitoring enabled
Oxygen sensor heater monitoring enabled
EGR system monitoring enabled
Catalyst monitoring complete
Heated catalyst monitoring complete
Evaporative system monitoring complete
Secondary air system monitoring complete
A/C system refrigerant monitoring complete
Oxygen sensor monitoring complete
Oxygen sensor heater monitoring complete
EGR system monitoring complete
Control Module Voltage
Absolute Load Value
Commanded Equivalence Ratio
Commanded Air/Fuel Ratio
Relative Throttle Position
Ambient Air Temperature
Absolute Throttle Position B
Absolute Throttle Position C
Accelerator Pedal Position D
Accelerator Pedal Position E
Accelerator Pedal Position F
Commanded Throttle Actuator Control
Minutes run by the engine while MIL activated
Time since DTCs cleared
Evaporative Vapor Pressure
Evaporative Vapor Pressure (Wide)
Derived parameters:

Fuel Consumption (instantaneous and overall)
Distance Travelled
Fuel Economy (instantaneous and overall)