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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. smog test incomplete.

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: 2009 dodge caravan red lightning bolt and check engine light but checked codes with the key and not reading any codes

Hi Corey. Thanks for contacting us today. The red lightning bolt warning light indicates an issue with the charging system. In order to download the codes, you'll need a professional digital scanner. If you'd like to have one of our...

Q: Oil dipstick is stuck

The oil dipstick has small rivets in it toward the bottom which can sometimes make it difficult to get out depending on the angle or curvature of the oil dipstick tube that leads down to the oil pan. Sometimes wiggling...

Q: P0442-EVAP System leak detected

Hi. The evaporative emissions (EVAP) system is used to prevent fuel vapor from escaping into the atmosphere. Code P0442 stands for EVAP system small leak detected. The cause of this code can be difficult to diagnose. It could be triggered...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...