Troubleshooting Catalyst Monitor Not Ready Issue In 7 Simple Steps

The OBDII (On Board Diagnostic) System regulates the vehicle’s performance with the help of monitors. Two types of monitors are present in our vehicles – continuous and non- continuous. Continuous monitors operate as long as the engine runs.

Whereas, non-continuous monitors need certain conditions like speed, ambient, acceleration, fuel level, and much more to carry its testing process. Catalyst Monitors are non-continuous monitors that assess the ability of the catalytic converter to decrease harmful emissions.

But, what if your vehicle indicates ‘catalyst monitor not ready’? So, let’s explore further how to make your vehicle’s catalyst monitor ready!

7 Steps to Follow When Catalyst Monitor Not Ready

The output of the catalyst monitor can be either ‘not ready’ or ‘ready.’ If the output of the monitor is not ready, what does that indicates? It signifies that the requisite Drive Cycle has not run completely; thus, the catalyst monitor has not tested the catalytic converter.

So, in order to make the status of catalyst monitor ‘ready’, you need to follow these simple steps.

1. Make Sure the Engine Light is Off

The first and foremost step is to check whether the engine light is off. If your vehicle has active trouble codes, it may stop a monitor from running completely.

2. Check if your Vehicle has a Coolant Temperature

The drive cycle starts with a cold start. The engine coolant temperature of your vehicle should be below 50°C (122°F) and within 6°C (11°F) of the air temperature. You can achieve this by allowing your car to sit overnight.

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3. Let the Engine be Idle for 2 Minutes

Issues of catalyst monitor not ready

The next step is to start the engine and keep it idle for two and half minutes, keeping rear defroster and AC on.

4. Drive the vehicle at a Steady Speed of 55 MPH

Now, switch the rear defroster and ac off and keep the speed of your vehicle at 90 km/hr (55MPH) nearly for 3 minutes. During this period, the purge and Fuel monitor diagnostics will take place.

5. Decelerate your Vehicle’s Speed at 20 MPH

Make the speed of your vehicle fall gradually up to 32 km/hr (20 MPH). Avoid touching/shifting of clutch or brake.

6. Again Speed Up

Drive your vehicle back to 55MPH (90 km/hr) at 3/4 throttle for nearly five minutes. The catalyst monitor diagnostics will take place during this period. If the battery is detached or the catalyst is not ready, it might take five complete driving cycles to decide the status of the catalyst. For additional information about catalyst monitor, one can refer to maintenance tips by car experts.

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7. Stop the Vehicle

Now, make your vehicle slow down and allow it to sit idle for 2 minutes.

Reasons for catalyst monitor not ready
Steps for catalyst monitor not ready

That’s all. By practicing the above-mentioned steps carefully, you can easily troubleshoot the problem of ‘catalyst monitor not ready.’ Next time your vehicle shows such kind of signals; don’t forget to follow these steps.