Skip the auto shop - Our mechanics make house calls

Q: smog test incomplete.

asked by on

OBD catalyst/oxy snsr heat not completed. no engine check light on.

My car has 60000 miles.
My car has an automatic transmission.

A: If your Check Engine Light is not illuminat...

If your Check Engine Light is not illuminated, there is not a fault with the system. Before a vehicle can pass emissions testing, certain readiness monitors must be completed. One of which is the heater O2 monitor. The vehicle will need a cold start full drive cycle completed to get that monitor to set.

Let the vehicle completely cool down overnight. The next morning start the vehicle and let it warm up and take it on a drive. Head towards the interstate. Merge into the interstate and get into the slow lane of traffic. Hold the throttle to where your speed is between 55-65 mph. Do this for 3 minutes. Then get off at the next exit and try to time your exit to where your vehicle can coast down to 30 mph without touching the brakes during exiting. USE CAUTION AND AVOID COLLISIONS. BRAKE IF YOU MUST. The point of this is to force readiness. Circle back around and get back in the interstate in the opposite direction and head back home. Once home, let the vehicle cool back down. A few hours should be plenty of time.

Start the vehicle, if the Check Engine Light is not illuminated, you should be ready for inspection. If the Check Engine Light is on, you will need a qualified technician, like one from YourMechanic, to determine what the fault is and which part will need replacement.

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: Car sounding weird after engine fire

I wouldn't recommend driving the vehicle until you have the car checked by a professional. Engine fires can be caused for many different reasons, and leave damage to several components of the car. With all of these issues, I would...

Q: Oil Change and Smog Test

Hello! Your oil change appointment should not impact your car's ability to pass a smog test immediately after having the oil changed as the oil change has nothing to do with your car's emissions system or functionality.

Q: won't start

Hi there. In most cases, when you're getting fuel to spray efficiently through the fuel injectors, the issue will be caused by a bad mass air flow sensor, O2 sensor or perhaps an ignition system component that is creating a...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...