What is OBDII Service Test

The OBD2 is mainly emissions and the law at any time cars with faults can cause emissions to exceed the federal limit by 1.5 times. In general does not mean that this car includes a real emission issue. Many times it usually does not.


If the nature of the failure is such that it can cause emissions to come up, OBD2 will sort a code anyway. This is why some states allow drivers to decide on a second motor test if their car does not test OBD2 Scanner. In many cases, the particular vehicle will pass the actual tail test.

What is OBD2 Emissions Test?
Step 01: MIL (Malfunction Indicator Lamp) Check

An inspector checks to see if the MIL light appears when the key is turned on. In the event of light does not light up, the car will not check the light bulb.
MIL may be a real warning light, on the actual line that “pops up” when the OBDII system detects problems with the vehicle.
This light needs to be worked properly to move the test.
Results from the MIL Test (see below)

MIL Engine On: FAIL  | MIL Engine Off: PASS


Step 02: Readiness Monitor Status

The scan tool aftermarket device connected to the specific DLC (Diagnostic Link Connection), and the operation system is monitored for tracking availability. In case of not exceeding the allowed number of screens, the vehicle will be denied and request another vehicle as soon as it is fully controlled to produce the prepared flags.

The scanner also checks the specific condition of the MIL lamp (Is that off or on?) And download any possible error rules. When the MIL light is on and you can find any existing OBD II code, the car will not guarantee that you have to repair it. The car will not be successful if the DLC is missing, has recently been tampered with or even does not provide any kind of data.

What does “Ready” or “Not ready” state mean?

“Ready” means the OBDII program has tested this specific emissions control program.
“Not ready” means the OBDII program does not check this specific emissions control program.
N/A or N/S means the OBDII system is not required to test this emissions control program.

A ready readiness status will indicate if the OBDII system has checked each of your vehicle’s emission control systems. The specific VIR Waste Emission Rate (see below) shows the specific status of each monitoring of readiness.


innova EVAP leak

Misfire: Ready | Fuel System: Ready | Comp Component: Ready | Catalyst: Ready | Heated Cat: N/S | Evap: Ready | 2nd System: Ready |  O2 Sensor: Ready | O2 Sensors Htr: Ready | EGR Sys: Ready | Air flow Condition: N/S


1. For the 2001 model car plus newer, we allow a discontinuous display to become Not Ready but still pass the special check, but two or even more are not really willing to have can cause the car to fail.

2. For the 1996-2002 model, we allowed two discontinuous displays to be Not ready but still pass the test, but three or even more Not Ready could cause the car to fail.

Change to “Ready”

The car must be driven by a system activation template that creates screens to “Ready”. Specific drive models or even “drive cycles” for vehicles should be available from your automotive support consultant (dealer) or perhaps a qualified automotive service specialist. .

Disconnecting the battery may be the most common reason the “Not ready” screen:

Some of the known reasons for disconnecting the battery are:

Tune-up along with other engine maintenance
Replace the dead battery power
Install car radio
Install car alarm

Step 03: OBDII Fault Codes

When your final system checks, the specific scanner can be used to control the MIL lamp to confirm it is actually taking instructions from the computer on the computer. If the OBDII light is on, or maybe a car has failed on an OBDII emission test, your first job will be to verify the problem persistent. Means plugged into the ON-BOARD DIAGNOSTIC II program, giving out any saved rules and reviewing any kind of system information that can help you clarify what is causing the problem.

Start to see the following:

If the OBDII program finds a problem with the vehicle, MIL ON will “start” and the problem code, also known as the Diagnostic Trouble Code (DTC), will be kept in the vehicle’s computer. If this happens, the car will not check.

Truck Diagnostic Tool testing is very important for your vehicle. To avoid being rejected in the annual check, you can arrange your car for it yourself. Do not wait until the annual check with your problems. In the event that the test lamp is turned on, read the diagnostic trouble code together with the engine status immediately. It can save you a lot of time and future fixes plus fuel costs. You can do all this with the actual diagnostic software of CarSys Scan Android Apps. You can read all monitor states even with the free version.

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