OBD Readiness Monitors

Diesel Powered Vehicle Monitor Clarification Details

If your diesel-powered vehicle was unready at the time of inspection, the chart displayed on this page may be used to identify the monitors reported.

OBD readiness monitors are different for gasoline versus diesel vehicles. Detailed standards for readiness monitors for diesel powered vehicles can be purchased from the Society of Automotive Engineers (SAE) by following this link:

The information provided here is for informational purposes only. Please seek qualified personnel for complete diagnostic and/or repair services if needed.

Monitor as indicated on VIR Diesel Monitor
Catalyst Monitor NMHC* Catalyst Monitor
Heated Catalyst Monitor NOx/SCR** After treatment Monitor
Evap System Monitor N/A
Air System Monitor Boost Pressure Monitor
Oxygen Sensor Monitor Exhaust Gas Monitor
Heated Oxygen Sensor Monitor Particulate Matter Filter Monitor
* Non-Methane HydroCarbons (NMHC)
** Selective Catalytic Reduction (SCR)