Skip the auto shop - Our mechanics make house calls

Q: Smog check failed due to Oxygen sensor

asked by on

Smog check failed due to Oxygen sensor OBDII not ready.. I am told to keep driving and it will reset. I drove 120 miles round trip and it did not reset. Help!

My car has 73000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. The first person to tell you this was correct to a certain extent. If the system is not warmed up, the readings cannot be taken accurately. However, if the engine is warmed up and the system is still not reading correctly, you may have an issue with the oxygen sensor or the engine. If you have a warning light or an OBD-II code of any kind, you must resolve that issue before retesting. The issues can stem from misfiring issues to fuel problems. Only further testing will tell. For more help with diagnostics or repairs, contact our service department to schedule an appointment.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: How do I know when my wheel bearings are going out?

Your accessory and serpentine belts may squeak or chirp a bit in cold weather due to the fact that the belts become brittle and less pliable during the cold weather months. When they go from a cold stand still to...

Q: How can I remove the message "service the battery charging system?"

Hi there: If you've recently had major work done to your Chevrolet Equinox, it's always a good idea to have the ECU reprogrammed or updated so it can monitor those changes; especially if any aftermarket parts were used. However, the...

Q: Why can't i fix O2 sensor problem

In many circumstances, the O2 sensors are not the only culprit of a lean fuel curve. In many cases, a clogged fuel injector nozzle can also trigger the most common OBD-II error code (P-2191) that indicates a lean condition exists....

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...