Skip the auto shop - Our mechanics make house calls

Q: Catalyst not ready

asked by on

The catalyst says Not Ready.

Hi there. The powertrain control module (PCM) monitors the performance of emissions related systems in your vehicle. In the case of the catalytic converter, it looks at the signals from the oxygen sensors to determine catalytic converter efficiency. If the battery is disconnected or diagnostic trouble codes are cleared, the PCM must begin it’s monitor cycle over. In this case, the PCM will say the catalytic converter is "not ready" until it has completed another cycle. Unfortunately, the catalytic converter can take a long time to run through one its cycle. This is because the PCM is looking for specific driving conditions to be performed. I would drive your vehicle for a few more days then have the monitors re-checked to see if the converter monitor has run.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Is my car worth keeping based on the mileage? 2003 Lexus RX300

Hi there - despite being a "1st year model", this vehicle has an excellent reliability reputation. If you have kept yours up, and it sounds like you have, no reason to cast it aside. Make sure the timing belt gets...

Q: Brake line leak front right wheel well.

When the metal brake lines have leaks you need to first look to see the reason for the leak. Was the line damaged by something hitting it, rubbing through it or is the brake lines rusted to the point of...

Q: abs and brakes lights cane on

Hello. This may be related to faulty wheel speed sensors which are located at each of the four wheels. These sensors monitor wheel speed which is relayed to the ABS system. When the ABS system detects an abnormal speed for...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...